cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7514930.v1
title: Seasonal evaluation of the quality of surface waters of the Amazon River on the waterfront of Macapá City, Amapá, Brazil

description: Water is essential to life on Earth and crucial for humanity, but multiple and complex human activities alter this resource. This study evaluated the physical-chemical and bacteriological water conditions of the Amazon River at the Macapa city waterfront in the State of Amapa. The study was conducted at three points in the section between the mouth of the Igarapé das Pedrinhas and the mouth of the Canal do Jandiá, considering the spatial and temporal variations in seasonal periods. Samples were collected for analysis of the following variables: turbidity, dissolved oxygen, pH, temperature, total phosphorus, nitrate, total solids, biochemical oxygen demand, fecal coliform, and total nitrogen. Descriptive statistical analysis was performed on the data, to include the nonparametric statistical method of Kruskal-Wallis and the coefficient of variation. The results were evaluated individually and compared with the limits established by Resolution 357/2005 of the National Council for the Environment (CONAMA) using "class 2 for fresh water" as a reference. The Biochemical oxygen demand (BOD) values and total phosphorus were not within the resolution threshold. The results of the Water Quality Index (WQI) indicated that during the less rainy and rainy period the water at the Macapa city waterfront was classified as "good" and "excellent", respectively, where the turbidity and BOD were predominant for the decrease in WQI during the less rainy season. It is concluded that in periods of low water flow the contribution of wastewater discharged near the water uptake station for public supply may deteriorate water quality and compromise the health of the population.
DOI: 10.6084/m9.figshare.7509017
title: Soil aggregation, organic carbon and CO2 emission in different land uses in Brazilian Savanna, Triangulo Mineiro region

description: Soil aggregation and carbon distribution are important indicators of soil quality. Moreover, these attributes are closely related to CO2 fluxes in the soil-atmosphere interface. We sought to evaluate soil aggregation, organic carbon distribution and CO2 evolution in different land uses of Minas Gerais Triangle. Four different land uses were selected: (1) Panicum maximum, (2) Panicum maximum Jacqvr. (Tanzânia), (3) sugarcane, and (4) native Cerrado (control). In each land-use type, soil samples from a 0-10 cm layer were collected. The samples were air-dried and sieved in order to obtain aggregates sized 4-2 mm. The samples were submitted to wet-sieving to evaluate stability and also to obtain aggregates of different sizes: 4-2 mm; 2-1 mm; 1-0.5 mm; and 0.5-0.25 mm. Total organic carbon, humic substances and texture were determined for each aggregate size fraction. The CO2 emission was measured in field and lab conditions, both by the capture in NaOH solution method. The native Cerrado and Panicum maximum Jacqvr. (Tanzânia) areas (mostly clay) showed the highest soil aggregation. The conventional soil tillage adopted in sugarcane areas contributed significantly to aggregate disruption. In all of the areas, the largest aggregates had higher organic carbon and humic substances. Organic carbon content and soil texture seem to be closely associated with CO2 emissions in the areas studied.
DOI: 10.6084/m9.figshare.7509017.v1
title: Soil aggregation, organic carbon and CO2 emission in different land uses in Brazilian Savanna, Triangulo Mineiro region

description: Soil aggregation and carbon distribution are important indicators of soil quality. Moreover, these attributes are closely related to CO2 fluxes in the soil-atmosphere interface. We sought to evaluate soil aggregation, organic carbon distribution and CO2 evolution in different land uses of Minas Gerais Triangle. Four different land uses were selected: (1) Panicum maximum, (2) Panicum maximum Jacqvr. (Tanzânia), (3) sugarcane, and (4) native Cerrado (control). In each land-use type, soil samples from a 0-10 cm layer were collected. The samples were air-dried and sieved in order to obtain aggregates sized 4-2 mm. The samples were submitted to wet-sieving to evaluate stability and also to obtain aggregates of different sizes: 4-2 mm; 2-1 mm; 1-0.5 mm; and 0.5-0.25 mm. Total organic carbon, humic substances and texture were determined for each aggregate size fraction. The CO2 emission was measured in field and lab conditions, both by the capture in NaOH solution method. The native Cerrado and Panicum maximum Jacqvr. (Tanzânia) areas (mostly clay) showed the highest soil aggregation. The conventional soil tillage adopted in sugarcane areas contributed significantly to aggregate disruption. In all of the areas, the largest aggregates had higher organic carbon and humic substances. Organic carbon content and soil texture seem to be closely associated with CO2 emissions in the areas studied.
DOI: 10.6084/m9.figshare.7508591
title: Morphopedological approach applied to construction in the urban perimeter of Várzea Grande watershed, MT

description: This paper is based on a morphological approach applied to construction in the urban perimeter of Várzea Grande-MT, where the new campus of the Federal University of Mato Grosso will be installed, with the objective of supporting the infrastructure construction project in order to minimize the impact on water resources. The development of an integrated diagnosis of the components of the physical environment allowed interpreting the water operation in the hillside and the dynamics of the processes associated with environmental impacts. The results, summarized in a map with five morphopedologic compartments, superimposed on the construction project of the campus, enabled us to detect potential environmental problems and to identify support actions necessary to minimize the impact on surface water resources.
DOI: 10.6084/m9.figshare.7508591.v1
title: Morphopedological approach applied to construction in the urban perimeter of Várzea Grande watershed, MT

description: This paper is based on a morphological approach applied to construction in the urban perimeter of Várzea Grande-MT, where the new campus of the Federal University of Mato Grosso will be installed, with the objective of supporting the infrastructure construction project in order to minimize the impact on water resources. The development of an integrated diagnosis of the components of the physical environment allowed interpreting the water operation in the hillside and the dynamics of the processes associated with environmental impacts. The results, summarized in a map with five morphopedologic compartments, superimposed on the construction project of the campus, enabled us to detect potential environmental problems and to identify support actions necessary to minimize the impact on surface water resources.
DOI: 10.6084/m9.figshare.7518251.v1
title: Effect of different dephts water and doses of nitrogen and potassium in production of Tanzania grass

description: The study of the interaction between nitrogen, potassium and water content are important in defining the optimum doses of these factors in order to optimize the production of fodder. Thus, it had as objective in this study was to evaluate the effects of applying different water depths and nitrogen and potassium, in the production of Tanzania grass in southern state of Tocantins. To study the influence of water levels and combinations of N and K2O in the grass, the dry and wet periods of the year, it was determined during the experiment forage production. The highest yield in the same period was 8706 kg ha-1, with the dose of 576.79 kg ha-1 N: 0.8 K2O and water depth of 116% ETc, resulting in an increase of 246%. During the rainy season, the lowest yield was 6815 kg ha-1, a dose of 100 kg ha-1 yr-1 N: 0.8 K2O in the absence of irrigation. The highest yield in the same period was 11,710 kg ha-1, with the estimated dose of 672.9 kg ha-1 yr-1 N: 0.8 K2O and applied water depth of 120% of ETc, resulting in a increase of 71.8%. It was therefore concluded that work that the maximum dry matter yield estimated to the adjusted model was 20,216 kg ha-1 yr-1 obtained with the applied water depth equal to 949 mm and with the application of 630 kg ha-1 year-1 of nitrogen and potassium mixture in the ratio of a nitrogen unit for 0.8 potassium units.
DOI: 10.6084/m9.figshare.7518251
title: Effect of different dephts water and doses of nitrogen and potassium in production of Tanzania grass

description: The study of the interaction between nitrogen, potassium and water content are important in defining the optimum doses of these factors in order to optimize the production of fodder. Thus, it had as objective in this study was to evaluate the effects of applying different water depths and nitrogen and potassium, in the production of Tanzania grass in southern state of Tocantins. To study the influence of water levels and combinations of N and K2O in the grass, the dry and wet periods of the year, it was determined during the experiment forage production. The highest yield in the same period was 8706 kg ha-1, with the dose of 576.79 kg ha-1 N: 0.8 K2O and water depth of 116% ETc, resulting in an increase of 246%. During the rainy season, the lowest yield was 6815 kg ha-1, a dose of 100 kg ha-1 yr-1 N: 0.8 K2O in the absence of irrigation. The highest yield in the same period was 11,710 kg ha-1, with the estimated dose of 672.9 kg ha-1 yr-1 N: 0.8 K2O and applied water depth of 120% of ETc, resulting in a increase of 71.8%. It was therefore concluded that work that the maximum dry matter yield estimated to the adjusted model was 20,216 kg ha-1 yr-1 obtained with the applied water depth equal to 949 mm and with the application of 630 kg ha-1 year-1 of nitrogen and potassium mixture in the ratio of a nitrogen unit for 0.8 potassium units.
DOI: 10.6084/m9.figshare.7511342
title: Indexes for water management and planning on the Paraopeba River Basin, Minas Gerais State

description: Knowledge of the true amount of officially granted use of water and the spatial distribution of water usage in a watershed has become indispensable for the appropriate management of water resources. In this process, the use of indexes allows for the identification of possible water use conflicts. The objective of this study was to evaluate the indexes of conflict regarding water use in the management (icg) and planning (icp) of water resources in the Paraopeba River Basin, focusing on identifying possible water resource conflicts and on providing supportive information for the water management agency in Minas Gerais State. Besides the Digital Elevation Model (DEM) for hydrological analyses to calculate the drainage area for every river segment, the official amount of granted water use and estimated river flows at watershed confluences was also needed. The results of the icg calculation demonstrated that in 22.7% of the analyzed river segments the use of water was higher than what is legally granted, and this indicates a potential conflict regarding water use. The icp analyses showed that in three river segments the use of water was higher than the long-term mean flow. The combined icg and icp analyses led us to conclude that in the water use conflict scenario the solution could be establishing an infrastructure that would allow a year-round increase in the availability of water to be granted.
DOI: 10.6084/m9.figshare.7511342.v1
title: Indexes for water management and planning on the Paraopeba River Basin, Minas Gerais State

description: Knowledge of the true amount of officially granted use of water and the spatial distribution of water usage in a watershed has become indispensable for the appropriate management of water resources. In this process, the use of indexes allows for the identification of possible water use conflicts. The objective of this study was to evaluate the indexes of conflict regarding water use in the management (icg) and planning (icp) of water resources in the Paraopeba River Basin, focusing on identifying possible water resource conflicts and on providing supportive information for the water management agency in Minas Gerais State. Besides the Digital Elevation Model (DEM) for hydrological analyses to calculate the drainage area for every river segment, the official amount of granted water use and estimated river flows at watershed confluences was also needed. The results of the icg calculation demonstrated that in 22.7% of the analyzed river segments the use of water was higher than what is legally granted, and this indicates a potential conflict regarding water use. The icp analyses showed that in three river segments the use of water was higher than the long-term mean flow. The combined icg and icp analyses led us to conclude that in the water use conflict scenario the solution could be establishing an infrastructure that would allow a year-round increase in the availability of water to be granted.
DOI: 10.6084/m9.figshare.7508942
title: Spatial and seasonal heterogeneity of limnological variables in Itupararanga reservoir associated with the land use in the Bacia do Alto Sorocaba-SP

description: Among the human activities around waterbodies, pollution by runoff of agrochemicals and sewage discharges into waterbodies can cause nutrient loading, which contributes to the eutrophication process and degradation of these ecosystems. This work aimed to determine spatial and seasonal heterogeneity in surface waters of the Itupararanga Reservoir and analyzed the influence of land use on the reservoir water quality. The reservoir is used for water public supply and is located in Ibiúna City, São Paulo, Brazil. Trophic State Index (TSI) and limnological variables were analyzed in both the wet and dry seasons in 2013. Data were compared with land use maps and with Brazilian environmental legislation - CONAMA n° 357/2005. The results indicated that total phosphorus was not in compliance with the CONAMA standard. The reservoir showed spatial and seasonal heterogeneity for TSI and also for limnological variables. Spatial heterogeneity was demonstrated using cluster analysis of water quality and land use data. The cluster analysis indicated that forest cover is an important factor in preventing solids from entering into the system. It also indicated that agriculture practices around the Itupararanga Reservoir are the main sources of nitrogen, whereas tributaries are responsible for the major phosphorus inputs. Since the Itupararanga Reservoir is socially and economically important to the region, conservation and preservation measures are recommended in order to mitigate harmful activities to the aquatic environment.
DOI: 10.6084/m9.figshare.7508942.v1
title: Spatial and seasonal heterogeneity of limnological variables in Itupararanga reservoir associated with the land use in the Bacia do Alto Sorocaba-SP

description: Among the human activities around waterbodies, pollution by runoff of agrochemicals and sewage discharges into waterbodies can cause nutrient loading, which contributes to the eutrophication process and degradation of these ecosystems. This work aimed to determine spatial and seasonal heterogeneity in surface waters of the Itupararanga Reservoir and analyzed the influence of land use on the reservoir water quality. The reservoir is used for water public supply and is located in Ibiúna City, São Paulo, Brazil. Trophic State Index (TSI) and limnological variables were analyzed in both the wet and dry seasons in 2013. Data were compared with land use maps and with Brazilian environmental legislation - CONAMA n° 357/2005. The results indicated that total phosphorus was not in compliance with the CONAMA standard. The reservoir showed spatial and seasonal heterogeneity for TSI and also for limnological variables. Spatial heterogeneity was demonstrated using cluster analysis of water quality and land use data. The cluster analysis indicated that forest cover is an important factor in preventing solids from entering into the system. It also indicated that agriculture practices around the Itupararanga Reservoir are the main sources of nitrogen, whereas tributaries are responsible for the major phosphorus inputs. Since the Itupararanga Reservoir is socially and economically important to the region, conservation and preservation measures are recommended in order to mitigate harmful activities to the aquatic environment.
DOI: 10.6084/m9.figshare.7516052
title: Surface water quality data by principal component analysis

description: This study used multivariate techniques for data analysis in order to determine the natural and anthropogenic factors that contribute to the spatial and temporal variations of water quality in urban watersheds of Caxias do Sul, Brazil. Principal Component Analysis (PCA) was used to analyze data collected at 30 points between September 2012 and January 2014. Monitoring was conducted bimonthly in six urban basins, where a total of 21 physical, chemical and biological parameters were analyzed. We found that PCA can explain 71.3% of the total variance in water quality, and that domestic and industrial pollution are the main contributors to the water quality variation in the region, especially from the galvanic manufacturing sector. Furthermore, we observed a trend of self-attenuation of pollutants in water downstream from urban areas and great anthropogenic influence as the pressure from urbanized areas decreases.
DOI: 10.6084/m9.figshare.7516052.v1
title: Surface water quality data by principal component analysis

description: This study used multivariate techniques for data analysis in order to determine the natural and anthropogenic factors that contribute to the spatial and temporal variations of water quality in urban watersheds of Caxias do Sul, Brazil. Principal Component Analysis (PCA) was used to analyze data collected at 30 points between September 2012 and January 2014. Monitoring was conducted bimonthly in six urban basins, where a total of 21 physical, chemical and biological parameters were analyzed. We found that PCA can explain 71.3% of the total variance in water quality, and that domestic and industrial pollution are the main contributors to the water quality variation in the region, especially from the galvanic manufacturing sector. Furthermore, we observed a trend of self-attenuation of pollutants in water downstream from urban areas and great anthropogenic influence as the pressure from urbanized areas decreases.
DOI: 10.17632/wjjtz3xm83.1
title: Investigating elephant-induced piosphere effects in a Zambezian Baikiaea woodland with a high density of artificial waterholes (research data)

description: Data from a study exploring the impacts of elephant browsing on woody vegetation in Zambezi National Park, Zimbabwe, with a focus on browsing in relation to pumped waterholes. Vegetation was sampled in plots set at different distances from waterholes in two vegetation types (Teak/Baikiaea and Terminalia woodlands). The dataset contains plot level averages of elephant browsing (in terms of % plant biomass removal) and measures of vegetation structure (e.g. canopy volume/ha).
DOI: 10.6084/m9.figshare.7509680
title: Lactate dehydrogenase and malate dehydrogenase of Astyanax bimaculatus (lambari) from Una River basin as biomarkers of environmental impact

description: Fish spend their whole life cycle in water and receive the influence of its physico-chemical and biological components over time. The activities of lactate dehydrogenase (LDH) and malate dehydrogenase (MDH) of aquatic organisms can be altered by pollutants in the water. The aim of this study was to determine whether the activities of LDH and MDH in the gills and liver of Astyanax bimaculatus (lambari do rabo amarelo or Two Spots Astyanax in English), can be used as biomarkers of environmental impact in the Una River (SP) Basin. The lambaris for these studies were collected from three water bodies of this basin designated as p1 (Itaim River), p2 (stream by the road to the Municipality of Remédios) and p3 (lake on the road to the Municipality of Dr. José Luiz Cembranelli). The gills and liver were homogenized and this material was then centrifuged and the supernatant was used for LDH and MDH activity assays using the spectrophotometric method, which determined oxidation rate of NADH. The activities of hepatic LDH and MDH and gill MDH were not statistically different in the lambaris collected at the three sites. In the gill tissue, LDH activity of lambaris from p3 was lower than that from p1.This inhibition of LDH in lambaris from p3, as well as the inferior quality of water there, suggest the occurrence of pollutants in this water. It is concluded that the LDH of lambari gills has potential for use as a biochemical marker of environmental impact in the Una River.
DOI: 10.6084/m9.figshare.7509680.v1
title: Lactate dehydrogenase and malate dehydrogenase of Astyanax bimaculatus (lambari) from Una River basin as biomarkers of environmental impact

description: Fish spend their whole life cycle in water and receive the influence of its physico-chemical and biological components over time. The activities of lactate dehydrogenase (LDH) and malate dehydrogenase (MDH) of aquatic organisms can be altered by pollutants in the water. The aim of this study was to determine whether the activities of LDH and MDH in the gills and liver of Astyanax bimaculatus (lambari do rabo amarelo or Two Spots Astyanax in English), can be used as biomarkers of environmental impact in the Una River (SP) Basin. The lambaris for these studies were collected from three water bodies of this basin designated as p1 (Itaim River), p2 (stream by the road to the Municipality of Remédios) and p3 (lake on the road to the Municipality of Dr. José Luiz Cembranelli). The gills and liver were homogenized and this material was then centrifuged and the supernatant was used for LDH and MDH activity assays using the spectrophotometric method, which determined oxidation rate of NADH. The activities of hepatic LDH and MDH and gill MDH were not statistically different in the lambaris collected at the three sites. In the gill tissue, LDH activity of lambaris from p3 was lower than that from p1.This inhibition of LDH in lambaris from p3, as well as the inferior quality of water there, suggest the occurrence of pollutants in this water. It is concluded that the LDH of lambari gills has potential for use as a biochemical marker of environmental impact in the Una River.