bluuebunny/crossref_metadata_2025 huggingface dataset:
Responses of Alnus nepalensis seedling under high phosphorus stress: shifts in photosynthesis and phosphorus contents across different organs
Authors: Wu Zuqing , Li Mengyang , Dao Chengjiao , Zhao Biao , Xu Yinjiao , Liu Changming , Yan Kai
Published: March 2020

Large phosphate ores are located in Southwest China. Mining activities have led to serious degradation facing surrounding ecosystem, which hinders regional sustainable development. Re-vegetation is considered the ideal treatment to cope with this issue. Alnus nepalensis is considered the suitable tree species for restoration across mining sites, giving its N-fixing capacity and good adaptability. However, the growth of A. nepalensis seedling seems limited in phosphate abandoned land. In order to clarify the responses (phosphorus contents distribution and photosynthesis) of A. nepalensis seedling under high soil phosphorus stress, pot experiment was conducted. The results showed that higher soil phosphorus level leads to higher phosphorus concentrations observed in all organs of seedlings. In contract, A. nepalensis seedling’s respiration rate, stomatal conductance and photosynthetic rate, all the photosynthetic parameters decreased. It found the phenomenon that phosphorus content of leaves, roots, soil and stem were negatively correlated with those photosynthetic parameters, but clear causal metabolism pathway still needs further study. Anyway, extremely high phosphorus level would inhibit the photosynthesis, and even the growth of A. nepalensis seedling, corresponding strategy is needed when we use A. nepalensis to recover phosphate abandoned land.
Research on the Eco-environmental effect of Manufacturing Transformation and Upgrading of Xijiang River Economic Belt based on Internet Background
Authors: Song Ying , Cao Yuanping
Published: March 2020

Manufacturing industry is the pillar in the regional development whose impact on environment has been focused. The paper, using the data of 2008-2017 of Xijiang River Economic Belt, Construct comprehensive index of environmental effect for manufacturing transformation and upgrading and discuss the effect of transformation and upgrading on eco-environment. The result shows that while the economic developing, the Economic Belt’s environment is improving. And some advice about further manufacturing development based on ecological development and internet in the end.
Research on the Impact of Environmental Regulation on Haze Pollution in China
Authors: Yang Yuanhua , Li Yingdi , Tang Dengli
Published: March 2020

Using spatial exploratory data analysis technology, this paper empirically analyzes the spatial evolution of haze pollution, and examines the impact of environmental regulation on haze pollution based on Spatial Durbin Model in China from 2004 to 2016. The results show that there is a significant spatial autocorrelation for haze pollution in China, and the spatial distribution forms high-haze pollution high-high(H-H) cluster regions and low-haze pollution low-low(L-L) cluster regions. The H-H cluster regions have experienced a change from the central region to the western region and then to the eastern region, and the L-L cluster regions have expanded and shifted to the east. Second, the direct effect of environmental regulation on haze pollution is negative but not significant, while the indirect effect and total effect of environmental regulation on haze pollution are significantly positive, which shows the current environmental regulation has not played a role in suppressing haze pollution. This is inconsistent with the original intention of the government to implement environmental regulation policies and there is indeed a “green paradox” in China. In addition, FDI and population size have aggravate the haze pollution in the region, and the improvement of the industrial structure is conducive to the improvement of haze pollution.
Temporal and Spatial Distribution Characteristics of Air Pollution and the influence of Energy Structure in Guangdong-Hong Kong-Macao Greater Bay Area
Authors: Tang Dengli , Lu Yinan , Cai Wenyi , Zhu Xinwei
Published: March 2020

Based on the panel data of 11 cities in GBA from 2010 to 2016, this paper uses spatial data analysis method to study the temporal and spatial distribution characteristics of air pollution, and the impact of energy structure on air pollution in GBA. The results show that the more serious air pollution is mainly distributed in Zhaoqing, Foshan, Jiangmen, etc. Air pollution has spatial correlation and obvious “path dependence” characteristics in spatial distribution. Secondly, the energy structure coefficient is positive, which means that the coal consumption increases 1%, the air pollution index will rise by 0.1381%. At the same time, a “U”-type relationship exists between per capita GDP and air pollution.
2008-2016 Water security status and short plate element screening in Shandong province
Authors: Li Xinying , Zhao Qiang , Gao Qian
Published: March 2020

In order to explore the applicability of the methods for protecting regional water resources, the water resources safety evaluation index system of Shandong Province was constructed, and the water resources safety relative closeness degree was used to characterize the water resources security situation of Shandong Province from 2008 to 2016; the matrix of water resources safety impact factors of Shandong Province was constructed. The factor analysis method is used to calculate three principal component factors, and the short board elements are identified. The paper concluded by comparing the development trend of water resources security in Shandong from the aspects of vertical (interannual) and horizontal (indicator). The results show that: (1) The water security system of Shandong Province was mildly unsafe in 2009. It was barely safe in 2015 and 2016, and the rest of the year was in an unsafe state. In 2008-2016, the state of water resources security in Shandong Province showed that the situation in the previous period was relatively tight and the later contradictions eased, but the overall security situation was still severe. (2) Factor analysis shows that the lack of water resources and high-intensity development and utilization are the main short-term factors affecting water resources security in Shandong Province.
Comparative study of soil erosion along the Middle Route of South-to-North Water Transfer Project based on RUSLE model
Authors: Fan Jian , Yu Yan , Li Zhen , Meng Wenqing , Ma Weilin
Published: March 2020

In order to probe the impact of the construction of the Middle Route of the South-to-North Water Transfer Project on soil erosion in its buffer area and to offer support on decision which improve the surrounding soil and water environment, this paper conducts a comparative study on soil erosion in 2010 and 2015 based on the RUSLE model. The results show that: 1) the soil erosion modulus in 2010 and 2015 are both at the level of micro-erosion;2) the effect of project on erosion becomes apparent in 200-500m buffer zone of the main canal, and the most severe buffer zone is in 200-300m; 3) with the increase of buffer distance, the soil erosion modulus in 2015 fluctuates as similarly as that does in 2010.
Analysis of spatio-temporal distribution characteristics and fog forming conditions of Zhejiang coast in recent ten years
Authors: Gao Xinxin , Yu Yun , Xu Lili , Qiu Ting , Zheng Xiaoqin
Published: March 2020

Based on the hydrometeorological observation data of Zhejiang coastal observation station from 2009 to 2018, the temporal and spatial distribution characteristics and fogging conditions of sea fog along the coast of Zhejiang Province were analyzed in this paper. The result shows that the average annual fog day along the coast of Zhejiang Province is 112 days according to the situation that the sea fog occurs as long as there is one station along the coast of Zhejiang Province. The fog season is from March to June and the sea fog occurs in the middle of the night and early in the morning. The spatial distribution of sea fog along the coast of Zhejiang Province is more in the middle of the two ends and the average annual fog days of each station are in the range of 19.2-82.0 days. Under the condition of fog, most of the relative humidity in Zhejiang coastal area is greater than or equal to 90%, the average temperature difference between gas and water is-0.5 - 2.1°C, and the direction of fog wind is mainly eastward. More than 93.6% of the sea fog occurs under the condition that the wind force is less than or equal to level 5. There are four main types of weather situation affecting the occurrence of sea fog in coastal areas of Zhejiang Province, including inverted trough type, low pressure sea exit type, weak cold air type and high-pressure sea entry type. When the continuous sea fog process occurs, the weather situation usually goes through the high-pressure sea entry type, the inverted trough type and the low pressure sea exit type. The wind direction will change with the variation of weather situation and the wind force will be less than or equal to 4 levels. When the wind is greater than level 5, the wind changes from west to southwest, and the sea fog tends to dissipate. Thick fog or strong fog occurs mainly in the middle of the night, early in the morning and around the evening.
Analysis of Soil Moisture Characteristics and Deficit Compensation of Forest Land in Nanxiaohegou Watershed
Authors: Zhang Ling , Song Xiaoyu , Fu Na , Li Lanjun , Zhang Zhixu , Li Huaiyou
Published: March 2020

Exploring the soil water characteristics of typical afforestation species Robinia pseudoacacia and Platycladus orientalis in the gully region of the Loess Plateau, and analyzing the compensation situation of soil water storage deficit before and after the rainy season, it provides reference for the selection of planting tree species in the process of water and soil conservation. The analysis results show that, the soil moisture content of different vegetations is different, and the soil moisture in different slope directions also shows differences. Soil water storage has the same change rule. Soil moisture continued to increase in the range of 0-30cm. it keeps decreasing in the range of 30-60cm, it fluctuates within 10% below 60 cm depth. DSW of robinia pseudoacacia forest was lower than that of platycladus orientalis, and CSW was higher than that of platycladus orientalis. The DSW of the shady slope is lower than the sunny slope, and the CSW is higher than the sunny slope.
Factor Influence on Energy Carbon Emissions: a Case of Upper Reaches of The Yangtze River of China
Authors: Rao Guangming , Han Xu , Zhu Yanping
Published: March 2020

This paper adopts STIRPAT model with ridge regression to estimate factor influence on energy carbon emissions with the case of the upper reaches of the Yangtze River of China. The result shows that seven factors have positive but different influence on energy carbon emissions, which impact coefficient of population is 5.559, and respectively is secondary industry value-added (1.054), CO2 emissions intensity (0.597), productivity (0.416), GDP per capita (0.352), urban employment (0.309) and urbanization (0.221). For improvement of factor influence on energy carbon emissions, it is urgent to promote industrial low carbon transition, encourage R&D of low carbon technologies for clean production and advocate low carbon urbanization and life.
Adsorption behavior of modified porous starch to methyl blue in aqueous solution
Authors: Zhao Zhipeng , Jiang Mengmeng , Mei Chentao , Huang Hui
Published: March 2020

Porous starch was prepared by replacing ice crystals in frozen starch gel with ethanol using a solvent exchange method. It was then modified by phosphoric acid and urea via solid-state reaction to produce modified porous starch. The modified starch was used to adsorb methyl blue in aqueous solution. Five adsorption kinetics and five adsorption isotherm were used to fit the experimental data, and the fitting effect was evaluated using seven error analysis methods to get the best model.
Effect of petroleum hydrocarbons on the carbon and nitrogen stable isotope composition of Nitzschia closterium
Authors: Li Na , Liu Yu , Liang Zhengyu , Liu Yuxin , Lou Yadi
Published: March 2020

The microalgae is an important test organism of Petroleum hydrocarbon pollution. The present study was selected the N. closterium under laboratory conditions, the acute toxicity test of 180# fuel oil CE-WAF was investigated. We found the main content of the PAHs of CE-WAF were C0-N, C2-N, C1-N and C0-P by GC-MS analysis, indicating the toxicity of PAHs could affect the growth and development of microalgae. The EA-IRMS was used to analyze the carbon and nitrogen stable isotope composition of N. closterium under the CE-WAF stress. More importantly, the value of δ13C increased with the culture time at the control group, but there was no significant difference in δ13C value with increased culture time at the high (5%, 7%, and 10%) CE-WAF concentrations. In addition, the δ15N value of microalgae was increased in the culture time at the same CE-WAF concentration. However, there was no significant difference in δ15N value with increasing CE-WAF concentration at the same culture time. This study illustrated that the toxic effects of PAHs could be detected by the δ13C value to reveal the impact on marine ecosystems, and provided basic data and related theoretical support for marine pollution detection systems.
Assessment of Heavy Metal Pollution in Soil Around a plastic metal factory in Jiaxing, China
Authors: Liu Ting-Ting , Hu Wen-Zhen , Wang Guo-Fang , Xue Jia-Ping
Published: March 2020

This study takes the soil around a plastic metal factory in Jiaxing as the research object, and measures the wind direction under the northwest wind in the autumn. The Hg, Cd, As, Ni in the soil samples at different horizontal distances and depths (0-30cm) The contents of seven elements of Pb, Cu and Cr were evaluated by the geoaccumulation index method, the Nemero pollution comprehensive index method and the potential ecological risk index evaluation method. The number of samples with severe pollution levels calculated by the Nemero pollution comprehensive index method accounted for 85.71% of the total. Using the potential ecological risk index evaluation method, it is concluded that the single ecological risk of Cd and Cr is very strong and above, and the samples account for 100% of the total sample. The soil accumulation index method was used to analyze the pollution of heavy metals: Cd>Hg>Ni>Cu>As, Cr>Pb. The results show that the ecological risk assessment results under the combined action of various heavy metals are not optimistic, and the potential ecological risks are extremely heavy.
Study on the contribution rate of urbanization and air-sea circulation factors to the increase of rainstorm in China
Authors: Feng Kong
Published: March 2020

More and more attention has been paid to the serious disasters caused by extreme precipitation events. The relationship between climate change and extreme precipitation has become the hottest science foreland issue. Based on the study of daily rainstorm observation records of 659 meteorological stations in China from 1951 to 2010, this paper shows that rapid urbanization may trigger a significant increase in large-scale rainstorm in China. The main conclusions are as follows: (1) In terms of time, China’s rainstorm rainfall, rainy days and rainfall intensity increased significantly, reaching 68.71%, 60.15% and 11.52% respectively. In space, the torrential rains in China gradually migrated from the southeastern coast to the spatial transition process of gradient expansion in Central, Southwest, North, and Northeast China. (2) The variance explanations of the rapid urbanization factors to the rainstorm rainfall, rainy days and rainfall intensity in China are 61.54%, 58.48% and 65.54% respectively, while the variance explanations of the climatic factors are only 24.30%, 26.23% and 21.92% respectively. Rapid urbanization factors are likely to trigger a significant increase in rainstorm rainfall in China. (3) The panel data of China’s county-level total population and the annual average of visibility days are significantly spatially correlated with rainstorm rainfall, rainy days and rainfall intensity. The correlation coefficient gradually increases with age, further indicating that rapid urbanization has triggered a significant increase in large-scale inter-decadal rainstorm in China.
Double exponential decay empirical model for indoor building materials TVOC emissions
Authors: Zhang Yan , Liu Yang , Wu Yongfa , Niu Yuru , Jiang Jinxia , Guan Hongyan
Published: March 2020

The double exponential decay model is proposed to simulate the total volatile organic compound emissions of indoor building materials. The simulation results are in better agreement with the experimental data than the classical model, and the release characteristic of volatile organic compounds is more accurately described.
Water and soil conservation technology of steep slope based on artificial vegetation restoration
Authors: Wang J , Liu G Q , Ma D L , Yang D F
Published: March 2020

The mountain steep slope is in serious soil erosion owing to the rain wash, and is prone to geological disasters. Restoring vegetation on steep slopes can effectively maintain water and soil, avoid disasters and protect the environment. The key point of restoring vegetation is to solve the difficulties of soil conservation on steep slopes and satisfy the basic needs of vegetation growth. Based on the design and discussion of vegetation species selection, growth hole design, substrate soil ratio and water and soil conservation facilities on steep slopes, a water and soil conservation technology based on artificial vegetation restoration is proposed. The results show that the soil with a certain thickness is successfully maintained on the steep slope and the artificial vegetation is restored.
Theoretical Study on Vegetation Restoration Ecology of Steep Slope
Authors: Chen Changbing , Ma Dongliang , Liu Guoquan , Yang Dafeng , Luo Wen
Published: March 2020

This paper applies the theory of ecology to discuss the effect of vegetation restoration on steep split slope by the vegetation form, the mechanical reinforcement of vegetation roots, the effect of vegetation root angle on soil stability of steep split slop, the effect of vegetation on erosion resisrance of steep split slope. The favorable condition of vegetation restoration for steep split slope is explained in principle, and it provides theoretical reference for vegetation restoration of steep split slope.
The comprehensive utilization technology of crop straw
Authors: Wang Wenhao , Cheng Zhichao , Cong Qu
Published: March 2020

the development of agriculture in our country is related to the economic development of our country, and agricultural development will produce a lot of crop straw. Crop straw is the name for the remains left after the crops are collected. In the north, corn is the most common one. A large number of crop straw burning causes a lot of pollution every year in the autumn harvest season, and damages the soil structure of the land. However, effective and reasonable return of crop straw can greatly increase the fertility of the land and effectively reduce the use of chemical fertilizer. Therefore, the comprehensive utilization of straw is under rapid research in order to effectively use the advantages of straw.
Nitrogen and Phosphorus Storage of Baiyangdian Wetland influences and Threats on the ecology factors
Authors: Li Rui Kang , Dai Qing Yun , Zhang Hong Mei
Published: March 2020

Baiyangdian is the north China plain, the largest and most typical freshwater lake wetland, has important effects on the ecological environment in north China, called the kidney of north China, therefore, strict protection of Baiyangdian wetland is of great practical significance. This Baiyangdian wetland’s study aims to understand the different ecological communities and wetland ecological health assessment in wetland system, and to analyze and study the water quality and biodiversity of Baiyangdian wetland. Then through analyses of nitrogen and phosphorus storage, advantages and disadvantages of Baiyangdian among the wetland are clarified. Finally, based on the successful experience of some other wetland, some suggestions on the future development of wetland are put forward for Baiyangdian .
Study on Establishing Early Warning Model of Soil Salinization Disaster
Authors: Li Wanwan , Jin Li , Li Qingguo
Published: March 2020

This paper introduced the selection of evaluation factors of soil salinization hazard warning model and the calculation of weight of various factors. We used the fuzzy optimal BP neural model to predict the development degree of future soil salinization, which can effectively reduce the impact on soil salinization disasters.
Research status and countermeasureson cold resistance and photosynthetic physiological response of flowers
Authors: Xie Pengyuan , Yang Shuhua , Qi Xiaoli
Published: March 2020

With the increasing attention to environmental protection and treatment, the winter heating mode in most areas is gradually changing from coal to gas or coal to electricity. Due to a variety of uncontrollable factors, there is a short period of temperature lower than the sub-low temperature, which often brings serious constraints and losses to the commercial production and ornamental utilization of flowers. Low temperature is one of the main abiotic stresses in the growth of potted flowers. The growth, development and physiological metabolism of potted flowers are directly affected by low temperature. Among them, photosynthesis is the most sensitive process to low temperature. Photosynthesis is the most important physiological and biochemical process on the earth, so the study of photosynthetic physiological response of potted flowers under low temperature stress is very important practical significance and application value in the production of potted flower varieties.
Analysis and Control Technology of blue Smoke in Coal-fired Power Plants
Authors: Guo Liqiang , Yan Hanbing , Li Yongxiang , Chen Xiufang , Liu Fengchun
Published: March 2020

The control of blue Smoke in coal-fired power plants is of great significance to the atmospheric environment. The emission of SO3 from coal-fired power plants is an important factor of blue Smoke production, which mainly comes from boiler combustion and selective catalytic reduction (SCR) denitration. When the content of SO3 in the flue gas is too high, it will cause problems such as dust accumulation, low-temperature acid corrosion, increased air preheater resistance, and degraded performance of the electric precipitator, which will affect the economical efficiency and safety of the unit. In this paper, the causes of blue Smoke in coal-fired power plants are analyzed, the conversion rate of SO3 is calculated and verified, and technical measures to control colored plumes are proposed.
Enzymatic Properties of Endopeptidase in Wheat Malt
Authors: Zhan Chao , Jin Yuhong , Zhao Zhengtao
Published: March 2020

Endopeptidase is the main enzyme in wheat malt. Besides, long chain proteins are broken down by endopeptidase into small protein molecules, or peptides, which can influence the beer quality. In this paper, enzymatic properties of endopeptidase in wheat malt were studied based on a more accurate method for the endopeptidase activity measurement. The activity of endopeptidase was determined by measuring the content of oligopeptides and polypeptides in the reaction system. It was found that the optimum temperature of wheat malt endopeptidase was 50°C. It was shown that endopeptidase was sensitive to temperature and the low temperature is more suitable for endopeptidase. Further increase of temperature to values higher than 50°C resulted in the decrease of enzyme activity. At 65°C, the enzyme activity was decreased to 7.47u±0.42, then the enzyme can be deactivated at temperatures higher than 70°C. The enzyme had optimal activity at pH 4.0. When the pH value was above 4, the enzyme activity cannot remain stable after incubation. The enzyme was inhibited by Ca2 +, Pb2 +, Zn2+, Cu2 +, EDTA.
Effect of Activation Condition on the Performance of Activated Sludge Carbon-Based Adsorbent in Diesel Desulfurization
Authors: Jin Mei , Hu Bao , Tang Xinnan , Zou Linling , Yu Guoxian
Published: March 2020

Sulfur compounds in diesel oil can be removed by the adsorption technology. Based on the urban sludge as the main raw materials, activated sludge carbon-based absorbents were prepared through the cothermalization of urban sludge and rice hull by adding ZnCl2 as the chemical activator under the different activation conditions. The obtained absorbents were characterized by nitrogen adsorption characterization and were investigated in the the dibenzothiophene adsorption capacity of n-octane model oil. The characterization and the adsorption performance results showed that the amount of the micropore volume and the ratio of the micropore volume to the total pore volume played the important effects on the dibenzothiophene adsorption capacity behavior. The adsorbent could be obtained a larger amount of micropore and a bigger specific surface area, micropore specific surface and micropore volume under the activation temperature of 600 °C and the activation time of 60 min, which resulted a better behavior on the dibenzothiophene adsorption capacity of 19.9 mg S/g. The application of urban sludge in the preparation of the desulfurization adsorbent can provide a new way for the harmless and resource recovery usage.
Effect of Zinc Chloride on the Sludge Carbon-Based Adsorbent in Diesel Desulfurization
Authors: Jin Mei , Hu Bao , Tang Xinnan , Zou Linling , Yu Guoxian
Published: March 2020

Sulfur compounds in diesel oil can be removed by adsorption technology. Based on urban sludge as the main raw materials, activated sludge carbon-based absorbent was prepared through the cothermalization of urban sludge and rice hull by adding ZnCl2 as the chemical activator. The obtained absorbent was characterized by nitrogen adsorption, elemental analysis, FT-IR characterization. The textural structure and pore distribution results showed that the amount of the micropore and the surface area played the important roles on the adsorption capacity. The elemental analysis results revealed that the percentage of C element was the key factor in the adsorption experimental. FT-IR characterization results illustrated that the oxygen-containing groups on the absorbent surface increased significantly with the addition of ZnCl2 activator, especially the amount of alcohol hydroxyl groups and quinone hydroxyl groups. ZnCl2 activated sludge carbon-based adsorbent was applied in the adsorption capacity of dibenzothiophene with model oil. As a result, the adsorption capacity was up to 19.9 mg S/g at ZnCl2 concentration of 50 wt %, which can provided a new way for harmless and resource recovery of urban sludge.
Study on the Effect of Porous Subsurface Flow Constructed Wetland on Sewage Purification
Authors: Zhou Xinyue , Han Yancheng , Wang Yuelei , Chu Pingping , Liang Mengyuan
Published: March 2020

In this paper, a new porous subsurface flow constructed wetland was developed to remove BOD, TN and TP from sewage. A water inlet is arranged at the front of the wetland 0.25m and 0.45m from the ground. The design has the characteristics of simple structure and uniform water distribution, which makes the wetland easy to construct and improve the removal effect of pollutants. The results showed that the average removal rates of BOD, TN and TP in the wetland system were 85.63%, 80.29% and 89.07%, respectively, when the average temperature was 26°C and the hydraulic retention time was 1.3d. The removal effect is good, which can play a certain ecological and social benefits.
Study on the optimization of the enzymatic hydrolysis of antimicrobial protein from Moringa oleifera Leaves by response surface method
Authors: Huang Zhilian , Kang Dandan , Li Jihua , Guo Changqing , Peng Shaodan
Published: March 2020

Moringa oleifera leaves contains antimicrobial protein, which is absent of optimized extraction and systematic analysis. The aim of this work is to provide a systematic research of its protein isolate hydrolysate on the optimized extraction via the response surface method and the functional properties. The isolated protein was obtained by alkali extraction and acid precipitation, which purity was 81.12%±0.03%. Through the response surface method, the result of the optimization obtained the enzymatic hydrolysis of antimicrobial protein was as follows, the substrate concentration of 5.09%, the Bromelain enzyme dosage of 3883.42 U/g, pH 7.0 and temperature of 55 °C for 3.64 h . And the protein hydrolysate was indicated that the purity was 88.59%±0.13%. Moreover, the ash, the crude fat and moisture were declined significantly compared with the protein isolate. This subject could provide basic theoretical basis for the application of M. oleifera leaves protein.
FDM based OA-ICOS for high accuracy 13C quantification in gaseous CO2
Authors: Jin Zehao , Külls Christoph
Published: March 2020

The wide-range applications of isotope analysis make isotope measurement approaches under attentive focus. Off-axis integrated cavity output spectroscopy technology (OA-ICOS) is the most advanced isotope analysis method; however, further studies are still needed to avoid signal noise and improve accuracy. Zero-phase low pass filtering multivariate Fourier Decomposition Method (FDM) was applied for data analysis in the present study, which has its unique advantage to fix up rapid but seasonal changes for nonlinear and non-stationary time series data. In the present study, δ13C content in gaseous CO2 sample were measured by OA-ICOS at ambient temperature. The experimental data treated by FDM showed less signal fluctuant and clearer value change tendency than what showed in raw data, whereas the data density kept same with that of raw data. In the meantime, the experimental results suggested that it is flexible to decide the variance explanation rate by simply change the order of an FDM filter. This approach meets up with the requirements of different practical application scenarios of isotope analysis, which enhances the feasibility for OA-ICOS application in real-time environmental monitoring field.
Research on ecological investigation and evaluation of highway area in mountainous area based on RS and GIS
Authors: Huang Cheng-Cen , Xu Guo-Ping , Yang Hua , Wei Ming , Jia Li-Qiang , Chen Liang , Hu Hao , Wang Zhao-Ming
Published: March 2020

With the development of economy, the road construction of our country gets a rapid progress. Especially in mountain roads, the influence of road construction on environment has increasingly been focused. The environmental problems of road construction on project are mostly embodied in those problems of water, air, and ecology. landscape, this paper is taking the Baise-Leye highway as the study area, using the remote sensing and GIS technique to investigate the eco-environment. With RS, GIS, from Remote sensing analysis and ecological degradation degree evaluation, comprehensive consideration of the ecological characteristics, economic and cultural development level, environmental pollution prevention, etc. Investigate and study the ecological status of roads before and after highway construction. Provide a basis for the rational presentation of ecological restoration measures, system of highway ecological landscape by using 3S technology and analytic hierarchy process.
Research of ecological landscape assessment system of highway based on 3D GIS
Authors: Huang Cheng-Cen , Xu Guo-Ping , Yang Hua , Wei Ming , Jia Li-Qiang , Chen Liang , Hu Hao , Wang Zhao-Ming
Published: March 2020

This paper is taking the Baise-Leye highway as the study area, using 3D technique to investigate the eco-environment. With the advancement of computer technology, especially the development of GIS technology, the paper is using the 3D GIS technique in the field of highway engineering will be more profound. The authors are taking the UAV image to extract 3D network and model, based on 3D model, the authors carry out highway environment simulation analysis. The authors also construct pollution assessment method to evaluate of road environment information.
Effects of root exudation on the accumulation of Cd by Chenopodium ambrosioides L. and maize in intercropping systems
Authors: Qin Li , Zhao Mimi , Li Bo , Li Yuan , Li Mingrui
Published: March 2020

Pot experiments were carried out to study the effects of intercropping by Chenopodium ambrosioides L. and maize on the root exudates of soluble sugar and amino acids, in order to understand the relationship between root exudates and cadmium accumulation in plants. The results showed that, compared with monoculture system: (1) after intercropping with maize, the content of soluble sugar in root exudates of C. ambrosioides increased by 106.54%, the content of amino acids increased by 52.73%, the available Cd content in rhizosphere soil increased by 12.09%, the root Cd content increased by 15.52%. (2) The content of soluble sugar in root exudates of maize increased by 40.41%, the content of amino acids increased by 70.59%, the available Cd content in rhizosphere soil increased by 29.35%, the shoot Cd content of maize increased by 208.26%. (3) There were significantly posotive correlations between the contents of soluble sugar and amino acids secreted by C. ambrosioides and maize roots and the available Cd content in soil. In addition, there was a significant positive correlation between the available Cd content in soil and the Cd contents in the shoots and roots of plants. The results showed that the increase of soluble sugar and amino acid content of root exudates under the intercropping system caused the change of the available Cd content in the rhizosphere soil, which eventually changed the accumulation of Cd in the shoot and root of C. ambrosioides and maize.
Air Quality and Local Government Governance in China
Authors: Liu Yan
Published: March 2020

China’s economy has been growing rapidly for decades. Despite the increasing GDP, its rapid development has caused a string of serious environmental problems, especially air pollution. With the frequent occurrence of serious and complex air pollution phenomena such as smog, China’s air quality problem has become a research focus of the international community, which poses severe challenges to the Chinese government to improve its environmental governance capability and governance methods. In spite of the central government’s continuous attention to air quality issues, local governments tend to choose economic growth over environmental protection. The law enforcement of local governments to control air pollution is a direct factor affecting regional air quality. China’s mode of environmental law enforcement has exposed many problems in the field of air quality control. Through direct leadership of the local Environmental Protection Bureau (EPB), the Chinese government has formed an old administrative mode and a one-sided guiding mechanism with economic development as an indicator. By analyzing the number of days with air quality on and above the Air Quality Level 2 in various regions in China, and by combining the analysis with the GDP of various regions in 2018, this study found that the number of days with air quality on or above Level 2 and the development of local GDP show a positive correlation. Therefore, in response to such management defects, China should focus on strengthening the response and implementation of local governments to environmental policies and form a management structure under the direct leadership of the Ministry of Ecology and Environment (MEE). Local governments should shift from the simple mode of “administrative supervision” to the comprehensive mode of “administrative supervision + coordination” to form a new mechanism of cooperative governance under the leadership of local governments and implemented by the Local EPB, to decompose the overall and stage tasks of air pollution control, and to specifically implement the governance tasks and objectives to specific local government departments and the local EPB. We need to improve the efficiency of regional air pollution control, and effectively curb the deterioration of air pollution.
Application and Research of High Salt Organic Liquid Wastes Incineration Equipment and Technology
Authors: Zhang Rong-Xiang , Wang Qing-Biao
Published: March 2020

High-salt organic liquid wastes treating were worldwide problem. It perplexes many chemical industries such as medicine, pesticide, metallurgy, papermaking, printing and dyeing. A new high temperature incineration technology is introduced. This is especially suitable for the treatment of organic waste liquid. At the same time, it is divided into a variety of segmentation technology routes. According to the type and amount of salt or different process routes, incineration technology can effectively transform organic waste liquid into harmless substances. At the same time, the process also recovers salt resources and generates steam, and the gas emission reaches the standard. In this paper, we will compare the different treatment methods for route selection. Through the summary of process optimization, it can provide strong support for innovation decision-making and application planning of liquid waste incineration technology.
Comparative Analysis of Adult and Adolescent Environmental Awareness and Intervention of Adolescent Environmental Awareness
Authors: Long Zhengxia , Wang Shuai , Gu Xiaoying , Sun Yan , Yu Jiawen , Yang Jinhua
Published: March 2020

This study investigated the contrast between the environmental awareness of adults and adolescents, which explained an intervention on the environmental awareness of adolescents. Questionnaire survey method was adopted, T test and variance analysis were used to obtain the results. In addition, relevant sample T test was conducted for the first and second post-test results of the experimental group to verify the durability of environmental education effect. Result shows that: (1) the environmental awareness of adults was slightly higher than that of adolescents; (2) short-term environmental education played an obvious role in improving young people’s environmental awareness in a short time. This study updated the conclusion that the environmental awareness of teenagers was higher than that of adults, indicating the achievement of environmental education in China over the past 20 years. It can be also concluded that the short-term environmental education had a certain effect on improving the environmental awareness of youth, but it couldn’t last long. Short-term environmental education can be regarded as a supplement in present environmental education curriculum. Moreover, environmental education should be continuously.
Air purification in confined spaces
Authors: Wu Mengjie , Liu Kun
Published: March 2020

How to provide clean, healthy and fresh indoor air in the process of controlling atmospheric pollution is one of the major challenges facing the present and the future. At present, people mostly use air purification technology to optimize indoor air quality. Air purification technology can effectively remove indoor pollutants and improve indoor air quality. By considering the types of pollutants, the improvement of air quality, the filtration performance of purifiers, the current research progress and advantages, limitations and challenges of air filtration technology are discussed, and the development trend of air purification technology is forecasted. This article reviews the synergy between different air purification technologies, air filtration theory and purification technology.
The effects of Enhanced UV-B Radiation on Root Morphology and Secretion Content of Rice (Oryza sativa Linn.)
Authors: Yang Jing , Li Ming-Rui , Qin Li , Feng Shu-Hua , Zhan Fang-Dong , Li Yuan , He Yong-Mei
Published: March 2020

A hydroponic experiment was carried out to study the effects of UV-B radiation (5.0kJ/m2) on root morphology and root exudates in the local rice variety Baijiaolaojing in a terraced field in the Yuanyang region of China. It was observed that UV-B radiation had the following impact on rice physicochemical properties (1) significant inhibition in both root biomass and the whole biomass of rice, (2) significant increase in the free amino acid and total phenol content secreted by roots on the 40th and 60th day of growth, (3) significant increase in the soluble sugar content in all three growth phases (4) significant increase in oxalic acid and succinic acid, (5) significant decrease in malic acid. The content of tartaric acid was not significantly impacted by the two treatments (natural light 0 kJ/m2, UV-B radiation (5.0kJ/m2). Therefore, UV-B enhancement significantly affects the content of low molecular organic acids in rice, which is closely related to its altered root morphology.
Study on Hydraulic Properties and Sediment Transport Law of Grassed Waterway
Authors: Lichao Zhang
Published: March 2020

Ecological grassed waterway not only has the function of drainage, but also has the ecological function of sediment, nitrogen and phosphorus and other materials transmission, filtering or blocking, material and energy source or convergence. Ecological grassed waterway plays an important role in preventing and controlling soil erosion and purifying water quality. As one of the ecological ditches, the ecological grassed waterway is widely used. As a new type of ecological restoration of soil and water conservation measures, the ecological grassed waterway has the characteristics of convenient construction and low cost. It is the effective combination of soil and water conservation measures, engineering measures and grassland. Ecological grassed waterway are composed of drainage ditches and the plants planted in them. Due to the existence of plants, the hydraulic characteristics and sediment transport rules of the ditches are changed. Therefore, based on the definition and significance of ditches and ecological grassed waterway, the study on hydraulic characteristics and sediment transport rules of ecological grassed waterway are summarized and analyzed, which is of important practical value for the technical development and scheme design of ecological grassed waterway, and can provide scientific reference for relevant research on ecological grassed waterway.
Mechanical Behavior Study of Bending and Compression of Pineapple Leaf Fiber
Authors: Zhuang Zhikai , Zhang Jin , Lian Wenwei , He Junyan , Huang Tao , Li Mingfu
Published: March 2020

This study aims to provide new-type textile raw materials for the textile industry with pineapple leaf fiber as an example. The bending of pineapple leaf fiber and compressibility of fiber assemblies were tested with JXW03 single fiber compression bending tester and KES-G5 minitype compression apparatus respectively, to study the change rule of bending property of pineapple leaf fiber and represent the compression characteristic curve of fiber assemblies. The results indicate that the values of EB and RB of fiber roots are 6.43GPa and 294.59E-5cN·cm2, and that of the middle segment of fiber are 2.82GPa and 118.17E-5cN·cm2; the mean values of Rc, ΔT and Lc of fiber roots are 57.73%, 4.33 mm and 0.46, and that of the middle segment of fiber are 62.20%, 4.65 mm and 0.43. Anova suggests that there exists highly significant difference in the sampling site in respect of equivalent bending modulus and flexural stiffness of fiber (P<0.01), no significant difference in respect of compressive mechanical indicators of fiber assemblies (P>0.05), the compression-restore curve of fiber roots and that of central assemblies are in the same shape, and they are similar in respect of compression recoverability, besides, the compression curve doesn’t coincide with restoration curve for fibers are of elasticity and viscosity concurrently.
Green Credit Risk Assessment under the Background of Water Ecological Civilization City Construction——Based on BP Neural Network Model
Authors: Fan Xiaohang , Li Qingguo , Xu Zhen
Published: March 2020

The construction of water ecological civilized cities requires a large amount of capital, but at the same time, the project itself has certain risks. Commercial banks are not only the main providers of credit funds, but also the main bearers of project risks. Strengthening the credit risk management of water ecological civilized urban construction projects and enhancing the financial support of commercial banks for water ecological civilized urban construction projects have become the key to further promoting the construction of water ecological civilized cities. At present, the credit risk assessment of commercial banks in China is based on traditional methods, and it is difficult to achieve the desired effect. This paper applies the AHP method to construct the credit risk index system of water conservancy projects, and establishes a credit risk assessment model through BP neural network technology. Finally, it combines 39 listed companies. The data is empirically analyzed for the model to verify the accuracy of the predictions.
Soil and Water Conservation Measures in mountain highway
Authors: Li Hongjun
Published: March 2020

More and more attention should be paid to the soil erosion in the process of highway construction in mountainous areas. According to the characteristics of highway construction in mountainous areas, the methods of combining permanent measures with temporary measures and combining engineering measures with plant measures are adopted to realize soil and water conservation. In the project construction, the establishment of a sound soil and Water Conservation Prevention and control system has achieved good results in the prevention and control of soil erosion.
Environmental impact and economic benefit evaluation of sewage sludge treatment technologies
Authors: Yang Xiyue , Mu Hailin , Zhao Heran , Xue Zhaoquan , Li Nan
Published: March 2020

In order to evaluate the environmental and economic performance of continuous thermal hydrolysis (CTH) of sludge disposal, we compare the CTH with three traditional technologies including anaerobic digestion, aerobic composting and dry-incineration. This study uses life cycle assessment (LCA) to assess their environmental impact of the above technologies, and selects ten characteristic indicators from e-Balance analysis software for quantification. We also adopt the cost-benefit ratio (B/C) to evaluate the technologies’ economic performances, and come to conclusion that the larger the value is, the more economically feasible it will be. The results show that, as a new sludge disposal technology, CTH has the best performance in both environmental and economic aspects, while dry-incineration and anaerobic digestion have the worst results in environmental and economic aspect respectively. Although sludge compost has a moderating effect on global warming, it could also be potentially toxic. Nevertheless, the use of raw materials and energy contributes significantly to the environmental impact of each scheme.
Rapid determination of bisphenol A in environmental water by solid phase extraction-ultra performance convergence chromatography
Authors: Li Genrong , Qiu Yue , Ruan Yan , Long Mei , Xia Zhining
Published: March 2020

A rapid method based on solid phase extraction-ultra performance convergence chromatography was established for the determination of bisphenol A (BPA) in environmental water. The chromatographic conditions and solid phase extraction conditions were investigated, and the rapid and effective analysis of BPA could be achieved in 4 min. The results showed that the method has a good linearity with BPA in the range of 0.20-100 mg/L with correlation coefficient (R2) of 0.9996. Furthermore, the limit of detection (LOD) was 0.01 mg/L. The spiked recovery (R) and relative standard deviation (RSD) were 89.7%∼109.2% and 2.78%∼4.66%, respectively. The method is rapid, simple, accurate and reliable, which can provide technical reference for the detection of BPA in environmental water.