Pub Date : 2023-04-11DOI: 10.32526/ennrj/21/202200244
The prevalence of microplastics (MPs) in the environment has had a significant impact on ecosystems and posed a major threat to human health. This study investigated the distribution and characteristics of MPs in the Nhue - Day River basin in Vietnam, which is a critical source of biodiversity and used to support the economic growth of about 12 million people. The effect of seasonal variation and anthropogenic activities on the MP abundance was assessed. The findings revealed that the MPs abundance was significant in this study area. The average abundance of MPs in the dry season (754 items/m3) was insignificantly higher than that in the rainy season (706 items/m3) with n=9. The range in the abundance of MPs in the dry and rainy seasons was 49-2,827 and 400-1,133 items/m3, respectively. Microplastics in fiber forms were dominant in both seasons. The majority of the collected MPs were in the 0.5-2.0 mm size range, varying from 71% to 100% of the total MPs depend on sampling point. The total percentage of MPs size 0.3-0.5 mm in the dry season was 56.97% compared to 119.85% in the rainy season, indicating that the MPs were broken into smaller pieces due to UV exposure and weather conditions. Colored items occupied the majority of the MPs. This study can be used to gain a better knowledge of MP pollution in Vietnam’s river water.
{"title":"Distribution and Characteristics of Microplastics in Nhue - Day River Basin, Vietnam","authors":"","doi":"10.32526/ennrj/21/202200244","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200244","url":null,"abstract":"The prevalence of microplastics (MPs) in the environment has had a significant impact on ecosystems and posed a major threat to human health. This study investigated the distribution and characteristics of MPs in the Nhue - Day River basin in Vietnam, which is a critical source of biodiversity and used to support the economic growth of about 12 million people. The effect of seasonal variation and anthropogenic activities on the MP abundance was assessed. The findings revealed that the MPs abundance was significant in this study area. The average abundance of MPs in the dry season (754 items/m3) was insignificantly higher than that in the rainy season (706 items/m3) with n=9. The range in the abundance of MPs in the dry and rainy seasons was 49-2,827 and 400-1,133 items/m3, respectively. Microplastics in fiber forms were dominant in both seasons. The majority of the collected MPs were in the 0.5-2.0 mm size range, varying from 71% to 100% of the total MPs depend on sampling point. The total percentage of MPs size 0.3-0.5 mm in the dry season was 56.97% compared to 119.85% in the rainy season, indicating that the MPs were broken into smaller pieces due to UV exposure and weather conditions. Colored items occupied the majority of the MPs. This study can be used to gain a better knowledge of MP pollution in Vietnam’s river water.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44592307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-10DOI: 10.32526/ennrj/21/202200258
D. Amalia, D. Rachmawati
Salinity stress is a form of abiotic stress that threatens the sustainability of agriculture in almost all countries in the world. It has an impact in reducing plant productivity. Red amaranth (Amaranthus tricolor L.) is a vegetable crop that has high nutritional value, but extensive saline land area can cause red amaranth yields to decline. Osmopriming is a seed priming method in which seeds are immersed in a solution that has a high osmotic potential, such as PEG (polyethylene glycol) in order to increase germination under unfavorable conditions. This study determined the effect of osmopriming on germination, physiological, and root anatomical attributes of red amaranth roots under salinity stress conditions. The research design used a completely randomized design with two types of treatment, namely, osmopriming and salinity stress. Each treatment used three concentrations, seed osmopriming with 0%, 5%, and 10% of PEG and salinity stress of 0 mM, 50 mM, and 100 mM of NaCl. The measured parameters were germination, growth, physiological, and root anatomical characters. Osmopriming of seeds with 10% PEG increased germination as indicated by the germination percentage, time, and rate reaching 95.55%, 1.393 day, and 71.98%/day, respectively. Red amaranth plants that had been osmoprimed with 10% PEG grew faster when exposed to salinity stress. Application of PEG 5% and 10% increased total chlorophyll levels while decreasing proline levels and Ca-oxalate crystal density. Under salinity stress conditions, PEG application improved the root anatomical characters of red amaranth as shown by increased epidermis thickness, cortex thickness, and stele diameter. Priming application with 10% PEG has the potential to increase the tolerance of red amaranth to salinity stress.
{"title":"Seed Osmopriming Improves Germination, Physiological, and Root Anatomical Attributes of Red Amaranth (Amaranthus tricolor L.) in Salinity Stress Condition","authors":"D. Amalia, D. Rachmawati","doi":"10.32526/ennrj/21/202200258","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200258","url":null,"abstract":"Salinity stress is a form of abiotic stress that threatens the sustainability of agriculture in almost all countries in the world. It has an impact in reducing plant productivity. Red amaranth (Amaranthus tricolor L.) is a vegetable crop that has high nutritional value, but extensive saline land area can cause red amaranth yields to decline. Osmopriming is a seed priming method in which seeds are immersed in a solution that has a high osmotic potential, such as PEG (polyethylene glycol) in order to increase germination under unfavorable conditions. This study determined the effect of osmopriming on germination, physiological, and root anatomical attributes of red amaranth roots under salinity stress conditions. The research design used a completely randomized design with two types of treatment, namely, osmopriming and salinity stress. Each treatment used three concentrations, seed osmopriming with 0%, 5%, and 10% of PEG and salinity stress of 0 mM, 50 mM, and 100 mM of NaCl. The measured parameters were germination, growth, physiological, and root anatomical characters. Osmopriming of seeds with 10% PEG increased germination as indicated by the germination percentage, time, and rate reaching 95.55%, 1.393 day, and 71.98%/day, respectively. Red amaranth plants that had been osmoprimed with 10% PEG grew faster when exposed to salinity stress. Application of PEG 5% and 10% increased total chlorophyll levels while decreasing proline levels and Ca-oxalate crystal density. Under salinity stress conditions, PEG application improved the root anatomical characters of red amaranth as shown by increased epidermis thickness, cortex thickness, and stele diameter. Priming application with 10% PEG has the potential to increase the tolerance of red amaranth to salinity stress.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48165997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-16DOI: 10.32526/ennrj/21/202200259
S. Gautam, S. Timilsina, M. Shrestha, Bina Adhikari, Binay Bahadur Adhikari Khatri, J. Timsina
Nepalese community forests are globally recognized for sustainable forest management and improving the livelihoods of forest-dependent communities, but their contribution to carbon sequestration in trees and soil is rarely studied. This study was performed to understand the effect of management practices on carbon stock of two community forests (CFs) - Taldanda (managed) and Dangdunge (unmanaged) - dominated by Sal (Shorea robusta) in the mid-hills of Nepal. Twenty-one concentric sample plots, each of 250 m2, were laid out in each forest to estimate different carbon pools and a stratified random sampling intensity of 0.5% used to collect data. Results showed significant (p<0.05) differences in above and below-ground biomass and carbon sequestration potential between the two CFs. The managed and unmanaged forests had total carbon stock of 269.3±27.4 and 150.0±22.7 ton/ha, respectively, demonstrating 1.79 times higher carbon stock in the former than the latter. The managed forest had significantly (p<0.05) greater mean soil organic carbon (SOC) stock than the unmanaged forest. The SOC was highest in the upper soil layer (0-10 cm), with a steady decrease as the soil depth increased. All other measured carbon pools values were higher in managed compared to unmanaged forest. The difference in carbon stock was due to the manipulation of different forest management activities, including thinning, timber extraction, fire control, grazing, and fuel wood/fodder extraction. The study suggests that the implementation of proper forest management would be necessary for enhancing carbon stock in forest trees and soils.
尼泊尔社区森林在可持续森林管理和改善依赖森林的社区生计方面得到全球认可，但它们对树木和土壤中碳固存的贡献却很少得到研究。本研究旨在了解管理措施对尼泊尔中部以萨尔(Shorea robusta)为主的两个群落林(Taldanda)(有管理)和当当格(Dangdunge)(无管理)的碳储量的影响。在每个森林内设置21个同心样地，每个样地面积为250 m2，以估计不同的碳库，并采用0.5%的分层随机抽样强度收集数据。结果表明，两种碳源地上、地下生物量和固碳潜力差异显著(p<0.05)。人工林和非人工林的总碳储量分别为269.3±27.4和150.0±22.7 t /ha，前者是后者的1.79倍。人工林土壤有机碳储量显著高于非人工林(p<0.05)。土壤有机碳在表层(0 ~ 10 cm)最高，随土层深度的增加而逐渐降低。所有其他测量的碳库值在有管理的森林中高于未管理的森林。碳储量的差异是由于不同森林管理活动的操纵，包括间伐、木材提取、火灾控制、放牧和燃料木材/饲料提取。该研究表明，实施适当的森林管理对于增加森林树木和土壤的碳储量是必要的。
{"title":"Do Managed Hill Sal (Shorea robusta) Community Forests of Nepal Sequester and Conserve More Carbon than Unmanaged Ones?","authors":"S. Gautam, S. Timilsina, M. Shrestha, Bina Adhikari, Binay Bahadur Adhikari Khatri, J. Timsina","doi":"10.32526/ennrj/21/202200259","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200259","url":null,"abstract":"Nepalese community forests are globally recognized for sustainable forest management and improving the livelihoods of forest-dependent communities, but their contribution to carbon sequestration in trees and soil is rarely studied. This study was performed to understand the effect of management practices on carbon stock of two community forests (CFs) - Taldanda (managed) and Dangdunge (unmanaged) - dominated by Sal (Shorea robusta) in the mid-hills of Nepal. Twenty-one concentric sample plots, each of 250 m2, were laid out in each forest to estimate different carbon pools and a stratified random sampling intensity of 0.5% used to collect data. Results showed significant (p<0.05) differences in above and below-ground biomass and carbon sequestration potential between the two CFs. The managed and unmanaged forests had total carbon stock of 269.3±27.4 and 150.0±22.7 ton/ha, respectively, demonstrating 1.79 times higher carbon stock in the former than the latter. The managed forest had significantly (p<0.05) greater mean soil organic carbon (SOC) stock than the unmanaged forest. The SOC was highest in the upper soil layer (0-10 cm), with a steady decrease as the soil depth increased. All other measured carbon pools values were higher in managed compared to unmanaged forest. The difference in carbon stock was due to the manipulation of different forest management activities, including thinning, timber extraction, fire control, grazing, and fuel wood/fodder extraction. The study suggests that the implementation of proper forest management would be necessary for enhancing carbon stock in forest trees and soils.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46723940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article describes a combination of the driver-pressure-state-impact-response (DPSIR) framework and the logical framework approach (LFA) to develop water management strategies for a lagoon floodplain in Thailand. The DPSIR framework identified the cause-effect relationship between water and anthropogenic activities. LFA developed management strategies based on a systematic and logical approach. DPSIR analysis for the issue of water shortages for irrigated areas revealed the need for income from agriculture is a major driver, as indicated by agricultural development policy. The driver exerted pressure on increasing irrigation water demand, which increased the risk of a water shortage. The impact of water shortage was indicated by loss of farmer income. Existing responses led to inadequate problem-solving, for example, the promotion of mixed farming. Using data captured from DPSIR analysis for LFA analysis, proposed strategies to address the root causes of “ineffective irrigation water allocation” focused on improving (1) the performance of rotating irrigation systems; (2) monitoring water allocation; and (3) water use efficiency. The strategies developed using the combined DPSIR framework and LFA are effective because: (1) this method provides insight into complex water systems; (2) the strategies are developed logically to solve the problem at its root cause; and (3) there is intensive stakeholder participation and in-depth study of the area. This method is a helpful tool for developing a management strategy for a complex water system and is suitable for application by decision-makers. Stakeholder verification is required for future research to ensure that the strategies are appropriate and capable of being implemented.
{"title":"A Combined DPSIR Framework and Logical Framework Approach for Sustainable Water Resources Management in the Lagoon Floodplain","authors":"Benchawan Teerakul, Chaiwat Rongsayamanont, Rotchanatch Darnsawasdi, Peerapat Kosolsaksakul","doi":"10.32526/ennrj/21/202200170","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200170","url":null,"abstract":"This article describes a combination of the driver-pressure-state-impact-response (DPSIR) framework and the logical framework approach (LFA) to develop water management strategies for a lagoon floodplain in Thailand. The DPSIR framework identified the cause-effect relationship between water and anthropogenic activities. LFA developed management strategies based on a systematic and logical approach. DPSIR analysis for the issue of water shortages for irrigated areas revealed the need for income from agriculture is a major driver, as indicated by agricultural development policy. The driver exerted pressure on increasing irrigation water demand, which increased the risk of a water shortage. The impact of water shortage was indicated by loss of farmer income. Existing responses led to inadequate problem-solving, for example, the promotion of mixed farming. Using data captured from DPSIR analysis for LFA analysis, proposed strategies to address the root causes of “ineffective irrigation water allocation” focused on improving (1) the performance of rotating irrigation systems; (2) monitoring water allocation; and (3) water use efficiency. The strategies developed using the combined DPSIR framework and LFA are effective because: (1) this method provides insight into complex water systems; (2) the strategies are developed logically to solve the problem at its root cause; and (3) there is intensive stakeholder participation and in-depth study of the area. This method is a helpful tool for developing a management strategy for a complex water system and is suitable for application by decision-makers. Stakeholder verification is required for future research to ensure that the strategies are appropriate and capable of being implemented.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45629682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-13DOI: 10.32526/ennrj/21/202200257
Natraj Vaddadi, C. Vansarochana, Venkatesh Raghavan
With dwindling supply of surface water, Ground water is increasingly being used as a source of fresh water in many cities across the world. Consequently, there is an increasing need to evaluate groundwater potential of an area. Over the past few decades, Remote Sensing and GIS have been used for systematic investigations on potential recharge of aquifers. As in major cities of the world, the demand for water in Pune City is also increasing every year and demand outstrips the supply of surface water. This study delineated potential zones for artificial recharge across Pune City by using Multi-criteria analysis and the Analytical Hierarchy Process (AHP) techniques. Artificial recharge techniques especially the use of rainwater harvesting (RWH) are being deployed globally to augment supply of fresh water. Ground-water recharge is directly influenced by surface characteristics such as rainfall, geology, soil types, Land Use/Land Cover (LULC), drainage, lineaments/fractures, etc. Hence, six such parameters, namely, LULC, Slope, Soil texture, Rainfall, Drainage density, and Geology were considered to generate a groundwater recharge potential map. Based on the analysis, the study area was zoned into five classes, namely, low, moderate, good, very good and high groundwater potentials. About 45% of the city shows good to high potential for recharge. The results reveal that the high and good potential recharge zones lie to the western part of the city, whereas the central part (inner city) and the eastern part show medium to low potential for recharge. The results can help to identify areas for recharge and formulate a framework for systematic recharge of the existing aquifers in the area under study.
{"title":"Identification of Potential Groundwater Recharge Zones Using GIS Based Multi-Criteria and AHP Technique: A Case Study of Pune City, Western Maharashtra","authors":"Natraj Vaddadi, C. Vansarochana, Venkatesh Raghavan","doi":"10.32526/ennrj/21/202200257","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200257","url":null,"abstract":"With dwindling supply of surface water, Ground water is increasingly being used as a source of fresh water in many cities across the world. Consequently, there is an increasing need to evaluate groundwater potential of an area. Over the past few decades, Remote Sensing and GIS have been used for systematic investigations on potential recharge of aquifers. As in major cities of the world, the demand for water in Pune City is also increasing every year and demand outstrips the supply of surface water. This study delineated potential zones for artificial recharge across Pune City by using Multi-criteria analysis and the Analytical Hierarchy Process (AHP) techniques. Artificial recharge techniques especially the use of rainwater harvesting (RWH) are being deployed globally to augment supply of fresh water. Ground-water recharge is directly influenced by surface characteristics such as rainfall, geology, soil types, Land Use/Land Cover (LULC), drainage, lineaments/fractures, etc. Hence, six such parameters, namely, LULC, Slope, Soil texture, Rainfall, Drainage density, and Geology were considered to generate a groundwater recharge potential map. Based on the analysis, the study area was zoned into five classes, namely, low, moderate, good, very good and high groundwater potentials. About 45% of the city shows good to high potential for recharge. The results reveal that the high and good potential recharge zones lie to the western part of the city, whereas the central part (inner city) and the eastern part show medium to low potential for recharge. The results can help to identify areas for recharge and formulate a framework for systematic recharge of the existing aquifers in the area under study.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44919943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-22DOI: 10.32526/ennrj/21/202200195
B. K. Kafle, Chhatra Mani Sharma, S. Gurung, N. Raut, K. R. Kafle, R. Bhatta, Lekhendra Tripathee, Rukumesh Paudyal, Jun-ming Guo, Shi-chang Kang, Bed Mani Dahal
The concentration and composition of different salts in natural water bodies determine the water quality for various purposes. This study assesses the water quality of two mid-mountain lentic water bodies, Lake Phewa and Kulekhani Reservoir. For this purpose, selected physico-chemical parameters along with major ions such as HCO3-, SO42-, PO43-, NO3-, Cl-, Ca2+, Mg2+, Na+, K+, and NH4+ were analyzed. Major ions were analyzed using ion chromatography, anions by DX-600 and cations by Dionex ISC-2500 ion chromatographs. The sources of major ions were determined by using the Gibbs diagram, Piper plot, and Scatter plots. Dissolved oxygen, ammonia and phosphate showed seasonal variations in both lakes. The concentrations of cations are in the order of Ca2+ > Na+ > Mg2+ > K+ in both water bodies. However the trend of anions had small variations for Cl- and SO42- in Lake Phewa (HCO3- > Cl- > SO42- > NO3-) and Kulekhani Reservoir (HCO3- > SO42- > Cl- > NO3-). The Piper plot and equiline plots indicated that the water chemistry is dominantly controlled by the dissolution of carbonate minerals and to a limited extent by weathering of silicate minerals. This is further supported by the Gibbs plot showing bedrock geology as the main source of major ions. The overall study indicates that the hydrogeochemistry of these water bodies is controlled by local geology and is suitable for irrigation purposes.
{"title":"Hydrogeochemistry of Two Major Mid-hill Lentic Water Bodies for Irrigation of the Central Himalaya, Nepal","authors":"B. K. Kafle, Chhatra Mani Sharma, S. Gurung, N. Raut, K. R. Kafle, R. Bhatta, Lekhendra Tripathee, Rukumesh Paudyal, Jun-ming Guo, Shi-chang Kang, Bed Mani Dahal","doi":"10.32526/ennrj/21/202200195","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200195","url":null,"abstract":"The concentration and composition of different salts in natural water bodies determine the water quality for various purposes. This study assesses the water quality of two mid-mountain lentic water bodies, Lake Phewa and Kulekhani Reservoir. For this purpose, selected physico-chemical parameters along with major ions such as HCO3-, SO42-, PO43-, NO3-, Cl-, Ca2+, Mg2+, Na+, K+, and NH4+ were analyzed. Major ions were analyzed using ion chromatography, anions by DX-600 and cations by Dionex ISC-2500 ion chromatographs. The sources of major ions were determined by using the Gibbs diagram, Piper plot, and Scatter plots. Dissolved oxygen, ammonia and phosphate showed seasonal variations in both lakes. The concentrations of cations are in the order of Ca2+ > Na+ > Mg2+ > K+ in both water bodies. However the trend of anions had small variations for Cl- and SO42- in Lake Phewa (HCO3- > Cl- > SO42- > NO3-) and Kulekhani Reservoir (HCO3- > SO42- > Cl- > NO3-). The Piper plot and equiline plots indicated that the water chemistry is dominantly controlled by the dissolution of carbonate minerals and to a limited extent by weathering of silicate minerals. This is further supported by the Gibbs plot showing bedrock geology as the main source of major ions. The overall study indicates that the hydrogeochemistry of these water bodies is controlled by local geology and is suitable for irrigation purposes.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47600469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-16DOI: 10.32526/ennrj/21/202200200
Jiratiwan Kruasilp, Sura Pattanakiat, T. Phutthai, P. Vardhanabindu, Pisut Nakmuenwai
Land use and land cover (LULC) conversion has become a chronic problem in Nan province. The primary factors of changes are lacking arable land, agricultural practices, and agriculture expansion. This study evaluated the usefulness of multi-sensor Landsat-5 (LS5), Landsat-8 (LS8), Sentinel-1 (S1), and Sentinel-2 (S2) satellite data for monitoring changes in LULC in Nan province, Thailand during a 30-year period (1990-2019), using a random forest (RF) model and the cloud-based Google Earth Engine (GEE) platform. Information of established land management policies was also used to describe the LULC changes. The median composite of the input variables selection from multi-sensor data were used to generate datasets. A total of 36 datasets showed the overall accuracy (OA) ranged from 51.70% to 96.95%. Sentinel-2 satellite images combined with the Modified Soil-Adjusted Vegetation Index (MSAVI) and topographic variables provided the highest OA (96.95%). Combination of optical (i.e., S2 and LS8) and S1 Synthetic Aperture Radar (SAR) data expressed better classification accuracy than individual S1 data. Forest cover decreased continuously during five consecutive periods. Coverage of maize and Pará rubber trees rapidly expanded in 2010-2014. These changes indicate an adverse consequence of the established economic development promoted by industrial and export agriculture. The findings strongly support the use of the RF technique, GEE platform and multi-sensor satellite data to enhance LULC classification accuracy in mountainous area. This study recommended that certain informative and science-based evidence will encourage local policymakers to identify priority areas for land management and natural resource conservation.
{"title":"Evaluation of Land Use Land Cover Changes in Nan Province, Thailand, Using Multi-Sensor Satellite Data and Google Earth Engine","authors":"Jiratiwan Kruasilp, Sura Pattanakiat, T. Phutthai, P. Vardhanabindu, Pisut Nakmuenwai","doi":"10.32526/ennrj/21/202200200","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200200","url":null,"abstract":"Land use and land cover (LULC) conversion has become a chronic problem in Nan province. The primary factors of changes are lacking arable land, agricultural practices, and agriculture expansion. This study evaluated the usefulness of multi-sensor Landsat-5 (LS5), Landsat-8 (LS8), Sentinel-1 (S1), and Sentinel-2 (S2) satellite data for monitoring changes in LULC in Nan province, Thailand during a 30-year period (1990-2019), using a random forest (RF) model and the cloud-based Google Earth Engine (GEE) platform. Information of established land management policies was also used to describe the LULC changes. The median composite of the input variables selection from multi-sensor data were used to generate datasets. A total of 36 datasets showed the overall accuracy (OA) ranged from 51.70% to 96.95%. Sentinel-2 satellite images combined with the Modified Soil-Adjusted Vegetation Index (MSAVI) and topographic variables provided the highest OA (96.95%). Combination of optical (i.e., S2 and LS8) and S1 Synthetic Aperture Radar (SAR) data expressed better classification accuracy than individual S1 data. Forest cover decreased continuously during five consecutive periods. Coverage of maize and Pará rubber trees rapidly expanded in 2010-2014. These changes indicate an adverse consequence of the established economic development promoted by industrial and export agriculture. The findings strongly support the use of the RF technique, GEE platform and multi-sensor satellite data to enhance LULC classification accuracy in mountainous area. This study recommended that certain informative and science-based evidence will encourage local policymakers to identify priority areas for land management and natural resource conservation.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49286217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-14DOI: 10.32526/ennrj/21/202200207
R. Putri, B. Retnoaji, A. P. Nugroho
River flow to the sea is regarded as a pathway for the dispersion and pollution of microplastics. The hydrodynamics of the coastal water of Baru and Trisik Beaches may increase microplastic concentrations in this estuarine-marine area. This research evaluated the microplastic concentration in surface seawater and microplastic accumulation in consumed marine fish and performed histological analysis on the demersal marine fish intestine under natural exposure. Sample collection was carried out at 12 stations with three replications. The microplastics analysis was performed on marine fish (dorsal muscle, gills, and gastrointestinal tract) and seawater, and microplastic characterization was based on physical and chemical characteristics. Environmental parameters for statistical analysis included air and water temperature, pH, dissolved oxygen, and salinity of seawater. Histological analysis of the intestine was performed on fish from three stations with two demersal fish species. The latter analysis included the length of the villi, the depth of the crypt cells, epithelial denudation with hematoxylin-eosin staining, and the number of goblet cells with periodic acid Schiff alcian blue staining. The results showed that the microplastic concentration was distributed throughout the fish sample for each of the stations. Microplastic concentrations for surface seawater showed the same pattern as marine fish. Microplastic accumulation in marine fish indicated the transfer of microplastic particles to various organs in the fish’s body. The histological analysis indicated, microplastic internalization in the intestine tissue, damaging intestinal structures. Further research is needed as consuming marine fish contaminated by microplastics may present increasing health risks.
{"title":"Accumulation of Microplastics and Histological Analysis on Marine Fish from Coastal Waters of Baru and Trisik Beaches, Special Region of Yogyakarta","authors":"R. Putri, B. Retnoaji, A. P. Nugroho","doi":"10.32526/ennrj/21/202200207","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200207","url":null,"abstract":"River flow to the sea is regarded as a pathway for the dispersion and pollution of microplastics. The hydrodynamics of the coastal water of Baru and Trisik Beaches may increase microplastic concentrations in this estuarine-marine area. This research evaluated the microplastic concentration in surface seawater and microplastic accumulation in consumed marine fish and performed histological analysis on the demersal marine fish intestine under natural exposure. Sample collection was carried out at 12 stations with three replications. The microplastics analysis was performed on marine fish (dorsal muscle, gills, and gastrointestinal tract) and seawater, and microplastic characterization was based on physical and chemical characteristics. Environmental parameters for statistical analysis included air and water temperature, pH, dissolved oxygen, and salinity of seawater. Histological analysis of the intestine was performed on fish from three stations with two demersal fish species. The latter analysis included the length of the villi, the depth of the crypt cells, epithelial denudation with hematoxylin-eosin staining, and the number of goblet cells with periodic acid Schiff alcian blue staining. The results showed that the microplastic concentration was distributed throughout the fish sample for each of the stations. Microplastic concentrations for surface seawater showed the same pattern as marine fish. Microplastic accumulation in marine fish indicated the transfer of microplastic particles to various organs in the fish’s body. The histological analysis indicated, microplastic internalization in the intestine tissue, damaging intestinal structures. Further research is needed as consuming marine fish contaminated by microplastics may present increasing health risks.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42646806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-13DOI: 10.32526/ennrj/21/202200179
M. Dirgawati, M. R. Sururi
Dissolved organic matter (DOM) is the most important natural organic matter (NOM) fraction which reacts with chlorine to form harmful trihalomethanes (THMs) in water bodies. The characteristics of DOM could be affected by land use in the catchment, hence comprehensive study to understand DOM in the water body is important. This study was conducted in two watersheds with different upper stream land use to determine: (1) water characteristics, total organic matter (TOM), and DOM quality and quantity based on optical and absorption properties; (2) fluorescence dissolved organic matter (FDOM) compounds; (3) TOM and DOM relationships; and (4) THMs forming potential (THMFP) in both watersheds. Samples were collected from the upper Cimahi and Cijanggel Rivers which are dominated by settlements and plantations, respectively. Water characteristics were determined by pH, electroconductivity (EC), nitrite, and nitrate in unfiltered and filtered samples. TOM and DOM were characterized by chemical oxygen demand (COD) and chromophoric DOM (CDOM) parameters (A254, A355, A3/4), and organic compounds were determined as FDOM compounds. The measured pH, nitrate, and nitrite in the settlements-impacted watershed were greater than those in the plantations-impacted watershed. The main FDOM compounds in the settlement-impacted river were tryptophan microbial byproduct (T1) and tryptophan aromatic protein (T2), fulvic acid (A), and humic acid (C). Meanwhile, in the plantations-impacted river were T1, A, and C. THMFP was detected in both rivers which were greater in the plantations-impacted watershed than the settlements-impacted watershed.
{"title":"Characteristics of Dissolved Organic Matter and Trihalomethane Forming Potential Occurrence in Watersheds with Different Upstream Land Use","authors":"M. Dirgawati, M. R. Sururi","doi":"10.32526/ennrj/21/202200179","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200179","url":null,"abstract":"Dissolved organic matter (DOM) is the most important natural organic matter (NOM) fraction which reacts with chlorine to form harmful trihalomethanes (THMs) in water bodies. The characteristics of DOM could be affected by land use in the catchment, hence comprehensive study to understand DOM in the water body is important. This study was conducted in two watersheds with different upper stream land use to determine: (1) water characteristics, total organic matter (TOM), and DOM quality and quantity based on optical and absorption properties; (2) fluorescence dissolved organic matter (FDOM) compounds; (3) TOM and DOM relationships; and (4) THMs forming potential (THMFP) in both watersheds. Samples were collected from the upper Cimahi and Cijanggel Rivers which are dominated by settlements and plantations, respectively. Water characteristics were determined by pH, electroconductivity (EC), nitrite, and nitrate in unfiltered and filtered samples. TOM and DOM were characterized by chemical oxygen demand (COD) and chromophoric DOM (CDOM) parameters (A254, A355, A3/4), and organic compounds were determined as FDOM compounds. The measured pH, nitrate, and nitrite in the settlements-impacted watershed were greater than those in the plantations-impacted watershed. The main FDOM compounds in the settlement-impacted river were tryptophan microbial byproduct (T1) and tryptophan aromatic protein (T2), fulvic acid (A), and humic acid (C). Meanwhile, in the plantations-impacted river were T1, A, and C. THMFP was detected in both rivers which were greater in the plantations-impacted watershed than the settlements-impacted watershed.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47011628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-31DOI: 10.32526/ennrj/21/202200213
Wanida Pimpeach, W. Patthanaissaranukool, C. Polprasert, S. Polprasert, Suwisa Mahasandana, B. Panyapinyopol
In this study, chemical extraction using different acid concentrations, solids concentrations, and reaction time with subsequent interactions mechanism were carried out to evaluate the potential of phosphorus (P) recovery from primary settled-nightsoil sludge (PSNS). The response surface methodology (RSM) with Box-Behnken experimental design and one-way ANOVA analysis were also employed to establish optimal P leaching conditions. The extraction efficiency relied mainly on acid and solids concentration. The second-order polynomial model was successfully developed for extracting process designs. Approximately 93% of P could effectively be extracted from PSNS of 20,000 mg/L with 0.5 M of H2SO4 at reaction time of 45 min (optimum condition). Kinetic studies showed that the pseudo-second order was fit to describe leaching of P and metals. Moreover, the rate of kinetic constants (k2) of the P, Fe, Mg, and Ca under optimum condition were found to be 0.1607, 0.1099, 0.0317, and 0.0053 g/mg·min, respectively. The 99% leaching of maximum extracted P concentration at the equilibrium (9.6673 mg/g) took place in less than one hour. The findings of a suitable simple and low-cost method P dissolution from PSNS not only provides understanding of leaching kinetics, but also helps to pave a way of recovering P from a renewable resource in the field of waste utilization.
{"title":"Optimization and Kinetic Study of Phosphorus Dissolution from Primary Settled-Nightsoil Sludge","authors":"Wanida Pimpeach, W. Patthanaissaranukool, C. Polprasert, S. Polprasert, Suwisa Mahasandana, B. Panyapinyopol","doi":"10.32526/ennrj/21/202200213","DOIUrl":"https://doi.org/10.32526/ennrj/21/202200213","url":null,"abstract":"In this study, chemical extraction using different acid concentrations, solids concentrations, and reaction time with subsequent interactions mechanism were carried out to evaluate the potential of phosphorus (P) recovery from primary settled-nightsoil sludge (PSNS). The response surface methodology (RSM) with Box-Behnken experimental design and one-way ANOVA analysis were also employed to establish optimal P leaching conditions. The extraction efficiency relied mainly on acid and solids concentration. The second-order polynomial model was successfully developed for extracting process designs. Approximately 93% of P could effectively be extracted from PSNS of 20,000 mg/L with 0.5 M of H2SO4 at reaction time of 45 min (optimum condition). Kinetic studies showed that the pseudo-second order was fit to describe leaching of P and metals. Moreover, the rate of kinetic constants (k2) of the P, Fe, Mg, and Ca under optimum condition were found to be 0.1607, 0.1099, 0.0317, and 0.0053 g/mg·min, respectively. The 99% leaching of maximum extracted P concentration at the equilibrium (9.6673 mg/g) took place in less than one hour. The findings of a suitable simple and low-cost method P dissolution from PSNS not only provides understanding of leaching kinetics, but also helps to pave a way of recovering P from a renewable resource in the field of waste utilization.","PeriodicalId":11784,"journal":{"name":"Environment and Natural Resources Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44346966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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