bluuebunny/crossref_metadata_2025_split huggingface dataset:
Land use directions based on the level of land conversion vulnerability in the Padang Watersheds, North Sumatera
Authors: Purba S A , Slamet B , Rauf A 
Published: December 2021

AbstractHazardous land conversion in the Padang watersheds harms the hydrological conditions of the watersheds. Land use without considering the capacity and carrying capacity of the land results in decreased land productivity and increased watershed damage. This study aims to recommend directions for land use and land management in the Padang watersheds in areas that have a high and very high level of land conversion vulnerability. Analysis of land conversion vulnerability obtained by spatial modeling using ArcGis 10.3 software. The land cover data used in this study are data from the Ministry of Environment and Forestry in 2000 and 2019. Directions for land use are carried out through literature review in scientific journals, activity reports from both government and non-government agencies. Recommendations for land management directions are differentiated for urban areas and non-urban areas. Shrub cover that is vulnerable to conversion so that reforestation or other productive land uses are carried out with attention to soil and water conservation. Secondary dryland forest cover that is very vulnerable to conversion for partnerships with communities through community forestry/agroforestry schemes, rehabilitation and reforestation, and ecotourism. Plantation cover that is vulnerable to conversion can adopt an intercropping pattern of garden crops and seasonal crops. Agricultural land cover of dry land with high conversion vulnerability can adopt perennial crops at the land boundary and apply soil and water conservation. Residential areas in rural areas can adopt tree planting and make infiltration wells. The management direction for residential land in urban areas is to apply water conservation techniques (infiltration wells and polders) and arrangement of residential areas.
Carbon stock and vegetation estimation the abandoned pond, Pulau Sembilan, North Sumatra, Indonesia
Authors: Basyuni M , Simanjutak E O , Eddy S , Amelia R 
Published: December 2021

Abstract
The purpose of the study was to determine the species vegetation and carbon stock assessment derived from abandoned aquaculture ponds. Analysis of plant (tree, sapling, and seedling) was performed at Pulau Sembilan, Langkat, North Sumatra, Indonesia. The stage of the seedlings, saplings, and trees was analyzed from four transects. Each transect contained 100 m in length. Each estimated plot of a total of four transects comprised of 30 plots. The abandoned pond was dominated by Rhizophora apiculata and Bruguiera parviflora, the lowest on the species of Morinda citrifolia and Rhizophora mucronata. The diversity index of Shannon-Weiner was 1.44-1.72. The total biomass in the pond was 4,557.43 k/ha with a carbon potential of 2.10 tons/ha.
A review: hybrid simulation in forestry supply chain
Authors: Sembiring N , Napitupulu H L , Sembiring M T , Ishak A , Irwany F 
Published: December 2021

Abstract
Changes in supply chain availability in the forestry sector can significantly change efficiency responsiveness. This forestry supply chain network involves various processes such as harvesting, energy generation, wood, paper and board production. Methods that can be used to perform supply chain optimization are hybrid modelling and simulation. Substructure techniques with experimental testing methods that target numerical component conductors with communication loop components as well as transfer systems to form an entire system commonly referred to as Hybrid Simulation. In this study, we aim to find solutions so that the supply chain network in the forestry sector is not cut off by using hybrid simulation method. Hybrid simulations used can take into account when the supply chain will run out and prevent excessive exploitation so as to repair damage and recycle the supply chain so that it is not disconnected until the time period is taken into account. Each scientific article is rigorously selected to obtain articles that align with the purpose of this research.
Characteristics of forage garden vegetation of the Sumatran elephant (Elephas maximus sumatranus) in Medan Zoo
Authors: Zahrah M , Batubara R , Ardi R , Maulana M I , Auliah N L , Berutu A S 
Published: December 2021

Abstract
Medan Zoo is an ex situ conservation area for several wildlife species, covering an area of approximately 30 hectares, most of which are green open space and provide a forage garden for Sumatran elephants. This study aims to determine the characteristics of vegetation and the diversity of natural food types for elephants available in the Medan Zoo. Data collection using purposive sampling method, carried out in the forage garden which located in several points of elephant free-range. Based on the calculation of the Shannon-Wienner index, the overall diversity of plant species at the research location is 3.7 which can be categorized as high. The dominant understorey plants in the elephant forage garden are species from the family of Poaceae, namely Paspalumconjugatum, Eragrotisamabilis, Ottochloanodosa. Meanwhile, for speciesof trees habitus, the dominance for each level of vegetation starting from the tree, poles and saplings were: Meliaazedarach, Hibiscus tiliaceus and Cassia sp. There are types of elephant feed plants, classified into 8 families.The dominant type of natural feed is from the family of Poaceae.
Release of nickel ion and surface microstructure of NiTi archwire after immersion in tomato and orange juice
Authors: Lubis H F , Purba Y A 
Published: December 2021

Abstract
One of wires commonly used in orthodontic treatment is nickel-titanium (NiTi) archwire. NiTi archwire has the potential to release ions that can cause allergic and cytotoxic reactions. This study aimed to specify the difference in the amount of nickel ion release and surface microstructure of NiTi archwires after immersing in tomato and orange juice. NiTi archwire with a diameter of 0.016 inches and a length of 5 cm was used as the sample, which was immersed in 15 ml of solution and then stored at 37°C in an incubator for 24 hours. The samples were divided into two tretment groups (immersed in tomato and orange juice), each with nine samples. The immersion solution was tested for ion release using an Inductively Coupled Plasma–Mass Spectrometer. The microstructure of the wire surface was examined using a scanning electron microscope (SEM). The results revealed that group 1 has higher average amount of nickel ion release than group 2 and control. SEM result showed that the surface microstructure of the NiTi archwire in group 1 is roughest. There was a significant difference between the amount of nickel ion released and surface microstructure on NiTi archwire after being immersed in tomato and orange juice.
Physical and mechanical properties of four wood species from community forests in Binjai Regency, North Sumatra
Authors: Herawati E , Hartono R , Sinaga H M M 
Published: December 2021

AbstractThe fundamental properties of wood are significant to determine the purposes of wood used. This study aims to determine the physical and mechanical properties of four wood species namely terap (Artocarpus odoratissimus), durian (Durio zibethinus), mindi (Melia azedarachL.), and karet or rubber wood (Hevea brasiliensisMuell. Arg) from community forests in the Binjai Regency, North Sumatra. The physical properties were determined as described in ASTM D4442 and ASTM D2395 while the mechanical properties were conducted according to ASTM D143 and BS 373. The results showed the moisture contents of four wood species ranged 12.66– 15.28%, densities 0.35–0.59 gcm-3, and specific gravities (SG) 0.33–0.55. The compression, tensile and shear strengths parallel to the grain, hardness, modulus of elasticity (MOE), and modulus of rupture (MOR) ranged 20–35 MPa, 36–80 MPa, 6.5–9.7 MPa, 1713–3226 N, 5463– 7497 MPa and 43–71 MPa, respectively. Based on the SG and MOR values, the terap wood is included in strength class IV, while the other woods are in strength class III. Meanwhile, based on the compression strength values, the terap wood is included in strength class V, durian and mindi wood are in strength class IV, while karet wood is in strength class III.
Identification of land cover changes before and after forest and land fires in conservation areas of North Sumatra, Indonesia
Authors: Thoha A S , Sulistiyono N , Saraswita N , Wiranata D , Sirait S M , Inaldi R 
Published: December 2021

Abstract
Damage to conservation areas in North Sumatra can be mitigated by understanding the pattern of land cover change, which can be performed by detecting hotspots and their temporal and spatial patterns. This study aimed to explore land cover spatially and temporally before and after forest fires in the conservation areas in North Sumatra. Data on the hotspots, satellite imagery, land cover maps, and field verification were used to see the transition of land cover changes before and after forest and land fires. Temporal and spatial analysis was employed to see the trend of land cover changes of the land before and after the fires. Field verification was conducted through observations and interviews related to land cover conditions in the field caused by forest and land fires. This study found three conservation areas with the highest number of hotspots in 2014 in the period 2001-2019, including Gunung Leuser National Park (GLNP), Dolok Surungan Wildlife Reserve, and Barumun Wildlife Reserve during the 2001-2019 period. In 2010 and 2014 there were strong indications of a large area of land burning in three conservation areas. The burned land was near the outer boundary of the conservation areas and continued to expand into the areas over time. The area of the non-forest cover was relatively stable between periods prior to the discovery of several hotspots. Changes in forest cover to non-forest have become more widespread after the highest number of hotspots were detected in 2010. Conservation area management and various parties need to prevent the expansion of forest clearing considering the strategic role especially in GNLP as a world heritage.
Isolation and amplification of mangrove plants using DNA barcode in Percut Sei Tuan, North Sumatra, Indonesia
Authors: Syahbana R , Basyuni M , Siregar L A M 
Published: December 2021

Abstract
Mangroves are a collection of several species of trees or shrubs that distribute around the coastline and can survive in high salinity environments. Around 60% of mangrove forests in North Sumatra are reported to have been damaged, the main factors of this damage being the mangrove forests conversion into ponds and the expansion of oil palm plantations. Identification of mangrove species is very important in protecting and applying the biodiversity of mangrove forests. Identification of living things has evolved from morphological charcetrization to molecular identification. This study aims to explain the DNA isolation and PCR methods to identify mangrove species in North Sumatra. The results suggested that the rbcL primer used can detect mangrove species that were visualized in the form of DNA bands. The length of DNA fragments of mangrove species Acrosticum aureum ranged 632.0-619.6 bp, species Rhizophora apiculata 619.6-585.8 bp, species Nypa fruticans 600- 592.9 bp, species Avicennia alba 549.1-533.5 bp, species Hibiscus tiliaceus was not detected, and mangrove species Acanthus ilicifolius 480.3 bp.
The phenotypic of durian plant (Durio zibethinus Murr.) in Tapanuli Tengah Regency, North Sumatra, Indonesia
Authors: Sihaloho M A , Basyuni M , Hanafiah D S , Julianti E 
Published: December 2021

Abstract
Durian is a plant that is prone to genetic erosion. Exploration and characterization must be carried out to protect the local durian germplasm in Tapanuli Tengah Regency. This study aims to characterize the morphology of durian plants and determine the genetic relationship between the accessions of local durians in Tapanuli Tengah Regency. The research was done at Tukka, Sitahuis, and Kolang districts from December 2018 to February 2019 with a survey method using durian descriptor of IPGRI. Sampling techniques using purposive sampling with location judgment and morphological observation data were processed using NTSYS-pc 2.02 software and genetic relationship using the IBM SPSS (Statistical Package for the Social Sciences) program version 2.02 with cluster analysis. The result of the research showed that in Tukka, Sitahuis and Kolang district there were 75 accessions of durian been identified. The closest relationship is obtained on A61 and G71 originating from Kolang District with a similarity value of 7,345. The furthest relationship was obtained from A1 and A25 from Tukka district with the similarity value of 94,097.
Polyisoprenoid composition in chengham (Scyphiphora hydrophyllacea, Gaertn. f., Rubiaceae)
Authors: Basyuni M , Susilowati A , Susetya I E , Desrita  , Bimantara Y , Kajita T 
Published: December 2021

Abstract
Chengham (Scphyphora hydrophyllacea Gaertn. f., Rubiaceae) is a mangrove shrub or tree commonly in landward mangrove zones having some biological activities. All parts of S. hydrophyllacea have shown some components benefits to biological and pharmaceutical properties. This present study aimed to analyze the distribution and composition of polyisorenoid in senesnece leaves, fruits and branches of S. hydrophyllacea. Polyisoprenid patter was evaluated by two-dimensional thin layer chromatography (2D-TLC) approach. The total lipid (TL) content of five samples ranged from 5.7 mg/g in branches to 10.0 mg/g in the old leaves. Additionally, the percentage of polyprenol of senescence leaves slightly abundance compare to dolichol in the polyisoprenoid presence. Overall, polyprenol was found in higher content than dolichol in the yellow leaves. Results of this study found the type-II of S. hydrophyllacea fruits was in line with earlier reports on the plant fruits. The present study provided the occurrence of polyprenols and dolichols in S. hydrophyllacea tested organs.
Management of agricultural tools and machinery of SERASI program to improve food self-sufficiency in Banyuasin District of South Sumatra Province
Authors: Hasbil  , Hersyamsi  , Hananita Dauratri Ghirana 
Published: December 2021

Abstract
This study was carried out to find out the impact of utilized and without agricultural tools and machinery (alsintan) on farmers’ income in the SERASI program to achieve its optimal goal in Banyuasin District. This research was conducted from December 2020 to March 2021 at the Food Crops and Horticulture Department, BPP (Balai Penyuluhan Pertanian-Agricultural Extension Center) Muara Telang, Tanjung Lago and Rambutan Subdistricts. The descriptive method was used in this study with the tabulated presentation. The parameters used in this study were the comparison of mechanization and conventional use, the number of available tools and machines, and the impacts of using and without using alsintan on farmers’ income. The results showed that the average income of rice farming with alsintan in three study subdistrict were IDR 22,355,500, IDR 15,400,000 and. IDR 13,250,000 and without alsintan were IDR 7,830,000, IDR 6,950,000 and. IDR 6,528,000/ha per planting season. The SERASI program increased the Crop Index (IP 300) in Muara Telang Subdistrict, and IP 200 in Tanjung Lago and Rambutan Subdistricts. This showed that the Alsintan utilizing in agricultural processing from the soil processing until the harvesting was more effective compared to the process without alsintan.
Diversity of undergrowth understorey in Sibolangit Nature Park, Deli Serdang Regency, North Sumatra, Indonesia
Authors: Rambey R , Sitio A , Susilowati A , Rangkuti A B , Onrizal  
Published: December 2021

Abstract
The Sibolangit Nature Park area is one of the Nature Parks in North Sumatra which has various types of diverse plants ranging from understorey, epiphytes and various endemic tree species. The purpose of this study was to see the diversity of understorey species found in the Sibolangit Nature Park and its benefits. The results showed that there were 27 types of understorey plants from 18 families. Based on the family, the most commonly found were the Araceae family, namely 6 species (22.22%) and Zingiberaceae (11.11%). The understorey has the potential for medicinal plants, ornamental plants, poisonous plants, etc. The results showed that there were 15 species (55.5%) which were included in the category of ornamental plants, 7 species (25.92%) were included in medicinal plants, 1 species of poisonous plants (3.70%), 1 species of spice plants (3,70%), and 1 species (3.70%) protected plants and 2 species (7.40%) could not be explained scientifically. A protected and endangered plant species is Amorphophallus titanum
Instant porridge from natural local resources (orange sweet potato, carrot, and red bean) with highly nutritious as an alternative food source
Authors: Putra A , Nurminah M , Ginting S 
Published: December 2021

Abstract
Instant porridge is one of the food product that does not require a long time to serve. Instant porridge is usually made from rice flour. Food diversification is needed to make instant porridge more nutritious, one of which is making instant porridge from natural local ingredients such as orange sweet potato, carrot, and red bean. We made the composite flour that use to make instant porridge from mixture of orange sweet potato, carrot and red bean (orange sweet potato flour : carrot flour : red bean flour), namely P1 = 80% : 15% : 5%; P2 = 70% : 20% : 10%; P3 = 60% : 25% : 15%; P4 = 50% : 30% : 20%; P5 = 40% : 35% : 25%; P6 = 30% : 40% : 30%; P7 = 20% : 45% : 35%. The finalt result showed that the formulation composite flour in P7 = 20% orange sweet potato flour : 45% carrot flour: 35% bean flour was the best formulation and produce a good instant porridge by de-Garmo method.
Study of reduction of iron (Fe), copper (Cu) and lead (Pb) concents in leachate using electrocoagulation method with aluminum (Al) electrode
Authors: Herlina N , Siregar R L , Kurnati A S 
Published: December 2021

Abstract
Leachate can be defined as the liquid resulting from the decomposition of waste and infiltration of rainwater in the landfill. Leachate has unique characteristics, it has a high content of organic, metals, acids, dissolved salts and microorganisms and due to the complex leachate content it requires processing in treating leachate. Electrocoagulation is one of technology that can be applied to remove organic and heavy metal content in leachate. In this study, it was seen how the effect of voltage and contact time using aluminum electrodes on decreasing the concentration of Fe, Cu and Pb in leachate then calculating the reduction efficiency of Fe, Cu and Pb. The treatment of electric voltages given in this study were 4, 8 and 12 volts with a contact time of 15, 30 and 45 minutes. The results showed metal removal reached 0.030 mg/L, 0.007 mg/L and 0.010 mg/L and with efficiencies of 99.476%, 99.364% and 98.214% for Fe, Cu and Pb parameters. The decrease in metal content by 21.8% is influenced by voltage and 3.74% is influenced by the contact time when tested using the Pearson Correlation Test. These results indicate that the leachate treatment process with electrocoagulation processing has great efficiency.
DNA extraction and pattern of crab and macrobentos from North Sumatran mangrove forest, Indonesia
Authors: Harahap A M , Basyuni M , Susetya I E 
Published: December 2021

Abstract
Mangrove forest ecosystem is one of the most productive and unique ecosystems that serves to protect coastal areas from various disturbances, as well as provide habitat for various animal species. The large number of crab species and macrobentos in mangrove ecosystems results in frequent errors in the naming of species that have similarities in morphological features. This problem can be solved through a comprehensive approach by combining morphological analysis with genetic analysi.This study aims to report a DNA extraction and PCR amplification prior was used for the identification of crab and macrozoobentos from mangrove forest, North Sumatra. Primer 16S has a conserved area so it is appropriately used in Polymerase Chain Reaction (PCR) and sequencing analysis to determine taxonomy, phylogeny and diversity between specie. Visualization of PCR amplification results with primer16S from crab samples and macrobentos resulting a low DNA band with a size of 206 bp and a high of 678bp
Economic value analysis of Simarjarunjung Nature Tourism Area, Simalungun Regency, North Sumatera
Authors: Purwoko A , Latifah S , Siahaan C 
Published: December 2021

Abstract
Indonesia’s natural potential is very diverse, one of which is the natural tourism potential of the provinces in Indonesia. Sumatra, especially North Sumatra, is currently developing its natural potential, namely the Simarjarunjung Nature Tourism Area. This area is a magnet for tourists, because the hill is one of the ideal locations to see the landscape of Lake Toba. This study is aimed to analyze the total economic value with the travel method (Travel Cost Method) and the factors that influence tourists’ visits to the Simarjarunjung Natural Tourism Area. The method used to estimate the economic potential of tourism activities in the Simarjarunjung Nature Tourism Area is the individual travel cost method, while to determine the factors that affect the intensity of tourist visits to the Simarjarunjung Nature Tourism Area, it is determined by multiple linear regression analysis. The research data were obtained by asking questions on the questionnaire to the visitors. The results showed that the economic potential of the Simarjarunjung Nature Tourism Area reached IDR. 6,207,894,000/year, and the variables that had a significant effect on the intensity of tourists’ visits to the Simarjarunjung Nature Tourism Area were travel costs, age, and distance variables.
Morphological identification of phosphate solubilizing and cellulolytic fungi from mangrove soil under Rhizophora stylosa stands
Authors: Elfiati D , Delvian  , Susilowati A , Rizki N W Y , Harahap A F M , Hidayat A 
Published: December 2021

AbstractMangrove forest is one of the forest ecosystems that can be found in tidal areas. Mangrove forest have ecological, socio-economic benefits for organisms that live in the sea. One of the microorganism that live in mangrove forest is fungus. Therefore, this study aimed to isolate and identify phosphate solubilizing and cellulolytic fungi from mangrove soil. Soil samples were collected from a stands ofRhizophora stylosain Lubuk Kertang Village, West Brandan District, Langkat Regency, North Sumatra. Soil samples were taken randomly with a dept of 0-20 cm. Isolation of phosphate solubilizing fungi was carried out using Pikovskaya medium and cellulolytic fungi using carboxyl methyl cellulose (CMC) medium. To determine the effectiveness of fungi qualitatively, the phosphate solubility and cellulolytic index were calculated. All isolates obtained were identified morphologically by observing colonies macroscopically and microscopically. This study obtained 12 isolates of phosphate solubilizing and 8 isolates of cellulolytic fungi. Phosphate solubility index ranging from 2.06-2.87 and cellulolytic index of 0.33-3.00. Morphological identifications showed that all isolates of phosphate solubilizing fungi belonged to the genusAspergillus, while all isolates of cellulolytic fungi belonged to the genusChaetomium.