The Toraja Highlands,encompassing Tana Toraja and North Toraja,form the strategic upper reaches of the Saddang Watershed in South Sulawesi,where steep terrain,active land-cover change,and high ecological sensitivity c...The Toraja Highlands,encompassing Tana Toraja and North Toraja,form the strategic upper reaches of the Saddang Watershed in South Sulawesi,where steep terrain,active land-cover change,and high ecological sensitivity converge.This study addresses the need for an objective and validated ecological sensitivity map to support sustainable mountain watershed management.We construct an ecological sensitivity index based on principal component analysis using four key indicators:land cover,vegetation density(NDVI),slope,and rainfall,and evaluate its reliability through multi-source validation.Inputs integrate national elevation models,Landsat 8 imagery,and satellite-derived rainfall.Rainfall represents a multi-year climatology for 2015–2024,whereas land cover and NDVI reflect recent surface conditions derived from a cloud-free 2024 composite.The resulting sensitivity zonation indicates that 41.10%of Tana Toraja and 67.11%of North Toraja fall into the very high sensitivity class,concentrated on steep slopes and intensively converted landscapes.Eventbased spatial cross-validation against independent landslide records yields overall accuracies of 67.65%and 66.67%,while field verification produces Kappa values of 0.847 and 0.871.Stakeholder appraisal further corroborates the mapped patterns.Together,these convergent lines of evidence identify priority areas for reforestation,soil conservation,slope stabilization,and sustainable watershed management.The transparent and reproducible workflow supports evidence-based risk reduction and resilience building in the upper reaches of the Saddang Watershed.展开更多
[Objective] The aim was to study ecological sensitivity in Jinjie mining area. [Method] Taking Jinjie mining area as study object, based on RS and GIS technology, ecological sensitivity in Jinjie mining area was asses...[Objective] The aim was to study ecological sensitivity in Jinjie mining area. [Method] Taking Jinjie mining area as study object, based on RS and GIS technology, ecological sensitivity in Jinjie mining area was assessed comprehensively from the aspects of soil erosion, desertification and geological disaster by means of multivariate weighted stack method. [Result] Most of Jinjie mining area belonged to extremely high sensitive or high sensitive area which accounted for 73.35% of total area, with little moderate sensitive (19.50%), low sensitive (0.96%) and non-sensitive area (6.19%); the unreasonable development of mineral resources would damage its ecological environment severely. [Conclusion] The study could provide theoretical foundation for the protection of ecological environment in mining area.展开更多
Since the 17th National Congress of the Communist Party of China, ecological civilization has been the key construction goal in China, which has a profound impact on the process of urbanization. In recent years, with ...Since the 17th National Congress of the Communist Party of China, ecological civilization has been the key construction goal in China, which has a profound impact on the process of urbanization. In recent years, with the rapid development of urbanization and unreasonable land development and utilization, the ecological environment has deteriorated sharply, and the stability of ecological environment has always been a difficult problem in the process of regional development. The spatial division of urban ecological function can be divided into different types of spatial utilization according to the fragile state of ecological environment, which not only guarantees urban construction but also maintains the ecological environment health, and has great economic benefits and ecological value in formulating regional development strategies and ecological protection. In this paper, from four perspectives of “land, water, human and forest”, eight factors affecting ecological sensitivity were selected, and GIS spatial superposition method was used to conduct qualitative and quantitative analysis on the ecological sensitivity of Baoji City, and the evaluation results of single factor ecological sensitivity and comprehensive ecological sensitivity were obtained. The areas with different ecological sensitivity are divided into extremely sensitive areas, highly sensitive areas, moderately sensitive areas, slightly sensitive areas and non-sensitive areas. The research shows that the proportion of extreme, high, moderate, mild and insensitive areas in Baoji City is 7.32%, 10.57%, 22.25%, 42.91% and 16.95% respectively. Finally, the areas with different sensitivity grades are identified as three types of urban ecological function areas: ecological conservation area, ecological coordinated moderate utilization area and ecological suitable construction area, so as to provide scientific theoretical basis for urban construction and land use optimization in Baoji City.展开更多
The effective identification and protection of ecological spaces is a fundamental cornerstone for achieving sustainable development and promoting a green society.It plays an indispensable role in ecological protection...The effective identification and protection of ecological spaces is a fundamental cornerstone for achieving sustainable development and promoting a green society.It plays an indispensable role in ecological protection,resource management,and environmental governance,and is of great significance for the sustainable development of human society.Rapid and scientific identification of ecological spaces provides a scientific foundation for regional ecological protection planning.In this study,we used survey data from the planning and design of forest resources alongside 2017 Landsat 8 OLI remote sensing image to comprehensively analyze forest ecological service functions and ecological sensitivity using the layer-cake model to identify ecological spaces in Nanjing City.The results show that the area of extremely important forest ecological service function zones in Nanjing was 288.57 km^(2),accounting for 3.47%of the total area of Nanjing.The area of highly sensitive zones in Nanjing was 464.39 km^(2),accounting for 7.05%.Considering both forest ecological service functions and sensitivity,the area of core ecological spaces in Nanjing was 692.86 km^(2),accounting for 10.52%of the total area,and the main land use types were woodland and waters.The area of transitional ecological space in Nanjing was the largest,reaching 3150.29 km^(2),accounting for 47.83%of Nanjing s total area.This study provides valuable insights for optimizing the layout of ecological spaces and serves as a reference for related research efforts.展开更多
Functional zoning is an important guarantee for regulating the land use intensity of national parks and maintaining the integrity and stability of natural ecosystem.In this paper,we tease out of the functional zoning ...Functional zoning is an important guarantee for regulating the land use intensity of national parks and maintaining the integrity and stability of natural ecosystem.In this paper,we tease out of the functional zoning models and methods based on the empirical analysis of the world national parks,and then take the Qianjiangyuan National Park(QNP)as an example,study the functional zoning method based on ecological sensitivity.Results show that,the goal of national park construction in the world is changing from enhancing national cohesion to displaying the national image,from the pure natural protection and recreation use to protection of the comprehensive function of natural ecosystem integrity protection,recreation,environmental education,etc.The establishment of QNP is to protect the natural ecosystem of sub-tropical lowland broad-leaved evergreen forest,also to meet the community development and recreational consume of large population in Eastern China.So this paper establishes an evaluation index system based on ecological sensitivity,combining ecosystem services,potential habitats of important species,and development opportunities.Based on the analysis result,the functional zoning of QNP can be divided into strict protection area,ecological conservation area,traditional using area and recreational area.In this way,it can make the functional partition reflect system controls thought in area difference and space layout,and take the corresponding management measures in different functional areas,to promote the sustainable evolution of the natural ecological system in national park.展开更多
This paper took the Nyingchi area in southeastern Xizang Autonomous Region of China as the research area,and selected five indicators of elevation,slope,slope direction,normalized difference vegetation index(NDVI)and ...This paper took the Nyingchi area in southeastern Xizang Autonomous Region of China as the research area,and selected five indicators of elevation,slope,slope direction,normalized difference vegetation index(NDVI)and water body as the evaluation system based on the current situation of domestic and foreign research and field investigation.The indicators were analyzed by the AHP method for weighting,and then an ArcGIS overlay analysis was applied.The results show that the ecological sensitivity of the Nyingchi region is generally increasing from the south of Nyingchi to the north of Nyingchi.The northern,western and southwestern parts of Nyingchi are extremely sensitive or highly sensitive,while the southern part is mostly insensitive or mildly sensitive ecologically.The proportions of areas for each sensitivity level are:not sensitive 54.81%,light sensitive 11.97%,moderately sensitive 10.34%,highly sensitive 8.65%,and extremely sensitive 14.23%.The results indicate that the overall ecological sensitivity of the Nyingchi region is low and this region is performing well with respect to ecological environmental protection.This study can provide some suggestions for targeted improvements of the ecological environmental protection in the Nyingchi region and even in the Tibetan Plateau region.展开更多
Against the background of accelerated urbanization in China, the expansion of urban land uses, especially the construction of development zones have incorporated urban development land uses, and more ecological spaces...Against the background of accelerated urbanization in China, the expansion of urban land uses, especially the construction of development zones have incorporated urban development land uses, and more ecological spaces have been invaded by construction activities. However, the maintenance of urban ecological security, scientificity, integrality and continuity of ecosystem, as well as scientificity of the defining methods and the effective supervision of the basic ecological control line have become bones of contention. This paper, from the perspective of "anti-planning", synthesized the theories and methods such as urban-rural planning, ecology and GIS, coupled ecological sensitivity assessment and ecological security pattern to define the basic ecological control lines of the planning area in Anqing City. The basic ecological control line area includes ecological baseline area and ecological development area. Management and control strategies of basic ecological control line were elaborated from the following aspects: implementation of the basic ecological control line, protection and utilization of ecological resources within the lines, solutions to existing construction land within the lines, adjustment mechanism and implementation guarantee mechanism of basic ecological control line.展开更多
Coordinating urban development with the protection of water resources is a serious global challenge faced by countries worldwide.This study constructed the coupled Water Ecological Security Pattern-Future Land Use Sim...Coordinating urban development with the protection of water resources is a serious global challenge faced by countries worldwide.This study constructed the coupled Water Ecological Security Pattern-Future Land Use Simulation(WESP-FLUS) model by integrating methods for identifying water–ecological sensitive areas and simulating land use type changes.Taking the Lanzhou-Baiyin metropolitan area in arid region of northwestern China as a case study,this research simulated land use patterns in 2030 under four development scenarios(natural development,urban economic optimization,ecological conservation priority,and urban-water coordinated development scenarios).The results identified 109.81 km^(2) of water–ecological source areas and 43 water–ecological corridors with a total length of 1255.4 km.Predicted land use patterns for 2030 displayed diverse trends,constrained by water–ecological sensitive areas across different scenarios,with urban built-up land mainly expanding radially around the central urban axis.The urban-water coordinated development scenario was the optimal solution that meets both urban development needs and water–ecological protection objectives.The urban built-up land could reach 546.68 km2 in 2030,representing a 91.39 km^(2) increase compared to 2020.This study aims to improve spatial planning methods under the “determining cities by water” concept,scientifically supporting territorial spatial planning and providing theoretical support for the coupling of urban development and natural environment in water-scarce arid regions.展开更多
Urbanization in small-and medium-sized cities has often been overlooked in urban studies.Research on urbanization has predominantly focused on large metropolitan cities;however,urbanization in small-and medium-sized c...Urbanization in small-and medium-sized cities has often been overlooked in urban studies.Research on urbanization has predominantly focused on large metropolitan cities;however,urbanization in small-and medium-sized cities also contributes to the acceleration of urban sprawl.Urban growth boundary(UGB)is an ecological approach designed to limit urban development.This study aimedto analyze environmental protection priority zonesby combining ecological quality and sensitivity indices to identify the areas suitable for UGB implementation.Tegal City and its surrounding areas(including Tegal and Brebes regencies)of Indonesia were selected as the study area.The ecological quality index was calculated using the normalized difference vegetation index,humidity index,land surface temperature,and normalized difference bare soil index.These indices were subsequently subjected to principal component analysis(PCA)to extract orthogonal factors,which were summed to derive the final index value.In parallel,we mapped and evaluated ecological sensitivity based on spatial planning policies and regulations.The results revealed that ecological quality in Tegal and Brebes regencies was predominantly categorized as good and very good ecological quality,whereas TegalCity exhibited moderate and poor ecological quality.Additionally,over 45.00%of the area in Tegal and Brebes regencies demonstrated very high ecological sensitivity.Consequently,more than 50.00%of the area in Tegal and Brebes regencies,along with 27.00%of Tegal City,were classified as ecological constraint zone,making them potential regionsfor UGB development.The UGB is expected to curtail urban expansion,promote compact city planning,and preserve ecosystem services to achieve urban sustainability.This study implies that planningsmall-and medium-sized cities is important to prevent urban sprawl and maintain environmental health.Designing UGB to limit urban expansion should be enhanced by better knowledge about its ecological functions in supporting urban sustainability.展开更多
Traditional aquatic ecological risk assessments are often constrained by a heavy reliance on extensive toxicological data and a limited consideration of interspecies interactions.To address these limitations,this stud...Traditional aquatic ecological risk assessments are often constrained by a heavy reliance on extensive toxicological data and a limited consideration of interspecies interactions.To address these limitations,this study proposes a novel framework:the“ecological node-food web”method.This approach establishes dose-response relationships between pollutants and ecosystem-level toxicity endpoints by integrating toxicological data from key“ecological node”species with food web modeling.Results demonstrate that data from a few key nodes can effectively mimic ecosystem-wide responses to pollutants.Compared to conventional methods,this approach reduces the need for extensive datasets,enhances cost-effectiveness,and elucidates risk mechanisms through changes in community structure.The method ultimately enables the derivation of scientifically robust ecological risk thresholds.展开更多
Ecosystem services can be enhanced through ecological restoration,industrial structure adjustment,land-use optimization,and agricultural and forestry ecosystem transformation.The ecosystem services in hilly and mounta...Ecosystem services can be enhanced through ecological restoration,industrial structure adjustment,land-use optimization,and agricultural and forestry ecosystem transformation.The ecosystem services in hilly and mountainous areas of southern China are crucially needed to be enhanced since these regions are important ecological functional zones in China.However,due to its large area,it is not possible to simultaneously upgrade the ecosystem services for all areas,and therefore,priority areas need to be selected to individually upgrade the ecosystem service function.In this study,via an approach of combining remote sensing,geographic information system,and spatial statistics,we identify the priority areas that need to be upgraded based on the analysis of ecological sensitivity,importance of ecosystem service function,and decreased degree in ecosystem services.For five counties in hilly and mountainous areas of southern China,only less than 2% of the total area was identified as the first priority area;its land-use compositions were analyzed and recommendations on how to enhance ecosystem service were suggested.This approach overcomes the conflict and contradiction issues associated with identifying priority areas in previous studies and solves the problems of high cost or difficult implementation of priority areas.展开更多
[Objective]This study aimed to assess the vulnerability of ecological environment in Hebei Province.[Method]Based on ArcGIS,by using the dominant factor and maximum limits factor method,we established the sensitivity-...[Objective]This study aimed to assess the vulnerability of ecological environment in Hebei Province.[Method]Based on ArcGIS,by using the dominant factor and maximum limits factor method,we established the sensitivity-reality indicator system and assessment model of the eco-environment vulnerability in Hebei Province to quantitatively evaluate its eco-environment vulnerability,and analyzed its spatial distribution.[Result]The status quo of environmental degradation was inconsistent with the sensitivity of eco-environment in Hebei Province.The area of severely vulnerable region accounted for only 4.1%of total area in Hebei Province,mainly distributed in nine counties or districts of Baxia region,Zhangjiakou,northwestern Hebei,which was covered with mountains and basins,showing bands,which resulted from the vulnerability of soil erosion and land desertification.In addition,the moderately vulnerable region made up 38.4%,having the largest proportion,and mainly distributed in the mountain and basin region in northwestern Hebei,Yanshan Mountain and the most regions of Taihang Mountain,due to the vulnerability of soil erosion.At the same time,there were also large patches of moderately vulnerable region in Bashang and Baxia of Zhangjiakou,owning to the vulnerability of land desertification.Besides,most plains were mildly vulnerable and slightly vulnerable regions,and their areas accounted for 25.1%and 32.4%respectively of total area.[Conclusion]The research could provide scientific references for safeguarding the ecological security and main functional district planing of Hebei Province.展开更多
基金funded by the Ministry of Higher Education,Science and Technology,Republic of Indonesia through the Indonesia Collaborative Research(Riset Kolaborasi Indonesia)grant(Number:01319/UN4.22/PT.01.03/2025)。
文摘The Toraja Highlands,encompassing Tana Toraja and North Toraja,form the strategic upper reaches of the Saddang Watershed in South Sulawesi,where steep terrain,active land-cover change,and high ecological sensitivity converge.This study addresses the need for an objective and validated ecological sensitivity map to support sustainable mountain watershed management.We construct an ecological sensitivity index based on principal component analysis using four key indicators:land cover,vegetation density(NDVI),slope,and rainfall,and evaluate its reliability through multi-source validation.Inputs integrate national elevation models,Landsat 8 imagery,and satellite-derived rainfall.Rainfall represents a multi-year climatology for 2015–2024,whereas land cover and NDVI reflect recent surface conditions derived from a cloud-free 2024 composite.The resulting sensitivity zonation indicates that 41.10%of Tana Toraja and 67.11%of North Toraja fall into the very high sensitivity class,concentrated on steep slopes and intensively converted landscapes.Eventbased spatial cross-validation against independent landslide records yields overall accuracies of 67.65%and 66.67%,while field verification produces Kappa values of 0.847 and 0.871.Stakeholder appraisal further corroborates the mapped patterns.Together,these convergent lines of evidence identify priority areas for reforestation,soil conservation,slope stabilization,and sustainable watershed management.The transparent and reproducible workflow supports evidence-based risk reduction and resilience building in the upper reaches of the Saddang Watershed.
文摘[Objective] The aim was to study ecological sensitivity in Jinjie mining area. [Method] Taking Jinjie mining area as study object, based on RS and GIS technology, ecological sensitivity in Jinjie mining area was assessed comprehensively from the aspects of soil erosion, desertification and geological disaster by means of multivariate weighted stack method. [Result] Most of Jinjie mining area belonged to extremely high sensitive or high sensitive area which accounted for 73.35% of total area, with little moderate sensitive (19.50%), low sensitive (0.96%) and non-sensitive area (6.19%); the unreasonable development of mineral resources would damage its ecological environment severely. [Conclusion] The study could provide theoretical foundation for the protection of ecological environment in mining area.
文摘Since the 17th National Congress of the Communist Party of China, ecological civilization has been the key construction goal in China, which has a profound impact on the process of urbanization. In recent years, with the rapid development of urbanization and unreasonable land development and utilization, the ecological environment has deteriorated sharply, and the stability of ecological environment has always been a difficult problem in the process of regional development. The spatial division of urban ecological function can be divided into different types of spatial utilization according to the fragile state of ecological environment, which not only guarantees urban construction but also maintains the ecological environment health, and has great economic benefits and ecological value in formulating regional development strategies and ecological protection. In this paper, from four perspectives of “land, water, human and forest”, eight factors affecting ecological sensitivity were selected, and GIS spatial superposition method was used to conduct qualitative and quantitative analysis on the ecological sensitivity of Baoji City, and the evaluation results of single factor ecological sensitivity and comprehensive ecological sensitivity were obtained. The areas with different ecological sensitivity are divided into extremely sensitive areas, highly sensitive areas, moderately sensitive areas, slightly sensitive areas and non-sensitive areas. The research shows that the proportion of extreme, high, moderate, mild and insensitive areas in Baoji City is 7.32%, 10.57%, 22.25%, 42.91% and 16.95% respectively. Finally, the areas with different sensitivity grades are identified as three types of urban ecological function areas: ecological conservation area, ecological coordinated moderate utilization area and ecological suitable construction area, so as to provide scientific theoretical basis for urban construction and land use optimization in Baoji City.
文摘The effective identification and protection of ecological spaces is a fundamental cornerstone for achieving sustainable development and promoting a green society.It plays an indispensable role in ecological protection,resource management,and environmental governance,and is of great significance for the sustainable development of human society.Rapid and scientific identification of ecological spaces provides a scientific foundation for regional ecological protection planning.In this study,we used survey data from the planning and design of forest resources alongside 2017 Landsat 8 OLI remote sensing image to comprehensively analyze forest ecological service functions and ecological sensitivity using the layer-cake model to identify ecological spaces in Nanjing City.The results show that the area of extremely important forest ecological service function zones in Nanjing was 288.57 km^(2),accounting for 3.47%of the total area of Nanjing.The area of highly sensitive zones in Nanjing was 464.39 km^(2),accounting for 7.05%.Considering both forest ecological service functions and sensitivity,the area of core ecological spaces in Nanjing was 692.86 km^(2),accounting for 10.52%of the total area,and the main land use types were woodland and waters.The area of transitional ecological space in Nanjing was the largest,reaching 3150.29 km^(2),accounting for 47.83%of Nanjing s total area.This study provides valuable insights for optimizing the layout of ecological spaces and serves as a reference for related research efforts.
基金The National Key Research and Development Program(2017YFC0506401)The Soft Science Research Program of Henan Province(182400410130)。
文摘Functional zoning is an important guarantee for regulating the land use intensity of national parks and maintaining the integrity and stability of natural ecosystem.In this paper,we tease out of the functional zoning models and methods based on the empirical analysis of the world national parks,and then take the Qianjiangyuan National Park(QNP)as an example,study the functional zoning method based on ecological sensitivity.Results show that,the goal of national park construction in the world is changing from enhancing national cohesion to displaying the national image,from the pure natural protection and recreation use to protection of the comprehensive function of natural ecosystem integrity protection,recreation,environmental education,etc.The establishment of QNP is to protect the natural ecosystem of sub-tropical lowland broad-leaved evergreen forest,also to meet the community development and recreational consume of large population in Eastern China.So this paper establishes an evaluation index system based on ecological sensitivity,combining ecosystem services,potential habitats of important species,and development opportunities.Based on the analysis result,the functional zoning of QNP can be divided into strict protection area,ecological conservation area,traditional using area and recreational area.In this way,it can make the functional partition reflect system controls thought in area difference and space layout,and take the corresponding management measures in different functional areas,to promote the sustainable evolution of the natural ecological system in national park.
基金The National Natural Science Foundation of China(32060370)The Science Foundation of Ministry of Education of The People’s Republic of China(18YJC850004)。
文摘This paper took the Nyingchi area in southeastern Xizang Autonomous Region of China as the research area,and selected five indicators of elevation,slope,slope direction,normalized difference vegetation index(NDVI)and water body as the evaluation system based on the current situation of domestic and foreign research and field investigation.The indicators were analyzed by the AHP method for weighting,and then an ArcGIS overlay analysis was applied.The results show that the ecological sensitivity of the Nyingchi region is generally increasing from the south of Nyingchi to the north of Nyingchi.The northern,western and southwestern parts of Nyingchi are extremely sensitive or highly sensitive,while the southern part is mostly insensitive or mildly sensitive ecologically.The proportions of areas for each sensitivity level are:not sensitive 54.81%,light sensitive 11.97%,moderately sensitive 10.34%,highly sensitive 8.65%,and extremely sensitive 14.23%.The results indicate that the overall ecological sensitivity of the Nyingchi region is low and this region is performing well with respect to ecological environmental protection.This study can provide some suggestions for targeted improvements of the ecological environmental protection in the Nyingchi region and even in the Tibetan Plateau region.
基金Sponsored by National Natural Science Foundation of China(4110156)National Science and Technology Support Program(2012BAJ08B01-1)
文摘Against the background of accelerated urbanization in China, the expansion of urban land uses, especially the construction of development zones have incorporated urban development land uses, and more ecological spaces have been invaded by construction activities. However, the maintenance of urban ecological security, scientificity, integrality and continuity of ecosystem, as well as scientificity of the defining methods and the effective supervision of the basic ecological control line have become bones of contention. This paper, from the perspective of "anti-planning", synthesized the theories and methods such as urban-rural planning, ecology and GIS, coupled ecological sensitivity assessment and ecological security pattern to define the basic ecological control lines of the planning area in Anqing City. The basic ecological control line area includes ecological baseline area and ecological development area. Management and control strategies of basic ecological control line were elaborated from the following aspects: implementation of the basic ecological control line, protection and utilization of ecological resources within the lines, solutions to existing construction land within the lines, adjustment mechanism and implementation guarantee mechanism of basic ecological control line.
基金supported by the National Natural Science Foundation of China (42471230)。
文摘Coordinating urban development with the protection of water resources is a serious global challenge faced by countries worldwide.This study constructed the coupled Water Ecological Security Pattern-Future Land Use Simulation(WESP-FLUS) model by integrating methods for identifying water–ecological sensitive areas and simulating land use type changes.Taking the Lanzhou-Baiyin metropolitan area in arid region of northwestern China as a case study,this research simulated land use patterns in 2030 under four development scenarios(natural development,urban economic optimization,ecological conservation priority,and urban-water coordinated development scenarios).The results identified 109.81 km^(2) of water–ecological source areas and 43 water–ecological corridors with a total length of 1255.4 km.Predicted land use patterns for 2030 displayed diverse trends,constrained by water–ecological sensitive areas across different scenarios,with urban built-up land mainly expanding radially around the central urban axis.The urban-water coordinated development scenario was the optimal solution that meets both urban development needs and water–ecological protection objectives.The urban built-up land could reach 546.68 km2 in 2030,representing a 91.39 km^(2) increase compared to 2020.This study aims to improve spatial planning methods under the “determining cities by water” concept,scientifically supporting territorial spatial planning and providing theoretical support for the coupling of urban development and natural environment in water-scarce arid regions.
基金funded by the Directorate of Research and Community Service, Ministry of Education, Culture, Research, and Technology, Indonesia (027/E5/PG.02.00.PL/2024)Bogor Agricultural University for their invaluable support and resources that made this research possibleDirectorate of Research and Community Service, Ministry of Education, Culture, Research, and Technology, Indonesia, for their financial and administrative support
文摘Urbanization in small-and medium-sized cities has often been overlooked in urban studies.Research on urbanization has predominantly focused on large metropolitan cities;however,urbanization in small-and medium-sized cities also contributes to the acceleration of urban sprawl.Urban growth boundary(UGB)is an ecological approach designed to limit urban development.This study aimedto analyze environmental protection priority zonesby combining ecological quality and sensitivity indices to identify the areas suitable for UGB implementation.Tegal City and its surrounding areas(including Tegal and Brebes regencies)of Indonesia were selected as the study area.The ecological quality index was calculated using the normalized difference vegetation index,humidity index,land surface temperature,and normalized difference bare soil index.These indices were subsequently subjected to principal component analysis(PCA)to extract orthogonal factors,which were summed to derive the final index value.In parallel,we mapped and evaluated ecological sensitivity based on spatial planning policies and regulations.The results revealed that ecological quality in Tegal and Brebes regencies was predominantly categorized as good and very good ecological quality,whereas TegalCity exhibited moderate and poor ecological quality.Additionally,over 45.00%of the area in Tegal and Brebes regencies demonstrated very high ecological sensitivity.Consequently,more than 50.00%of the area in Tegal and Brebes regencies,along with 27.00%of Tegal City,were classified as ecological constraint zone,making them potential regionsfor UGB development.The UGB is expected to curtail urban expansion,promote compact city planning,and preserve ecosystem services to achieve urban sustainability.This study implies that planningsmall-and medium-sized cities is important to prevent urban sprawl and maintain environmental health.Designing UGB to limit urban expansion should be enhanced by better knowledge about its ecological functions in supporting urban sustainability.
基金supported by the Major Program of National Natural Science Foundation of China(52293440,52293442).
文摘Traditional aquatic ecological risk assessments are often constrained by a heavy reliance on extensive toxicological data and a limited consideration of interspecies interactions.To address these limitations,this study proposes a novel framework:the“ecological node-food web”method.This approach establishes dose-response relationships between pollutants and ecosystem-level toxicity endpoints by integrating toxicological data from key“ecological node”species with food web modeling.Results demonstrate that data from a few key nodes can effectively mimic ecosystem-wide responses to pollutants.Compared to conventional methods,this approach reduces the need for extensive datasets,enhances cost-effectiveness,and elucidates risk mechanisms through changes in community structure.The method ultimately enables the derivation of scientifically robust ecological risk thresholds.
基金financially supported by the National Key Research and Development Program of China(2017YFC0505606)the Top Discipline and First-class University Construction Project(ydzxxk201618)of Minzu University of China。
文摘Ecosystem services can be enhanced through ecological restoration,industrial structure adjustment,land-use optimization,and agricultural and forestry ecosystem transformation.The ecosystem services in hilly and mountainous areas of southern China are crucially needed to be enhanced since these regions are important ecological functional zones in China.However,due to its large area,it is not possible to simultaneously upgrade the ecosystem services for all areas,and therefore,priority areas need to be selected to individually upgrade the ecosystem service function.In this study,via an approach of combining remote sensing,geographic information system,and spatial statistics,we identify the priority areas that need to be upgraded based on the analysis of ecological sensitivity,importance of ecosystem service function,and decreased degree in ecosystem services.For five counties in hilly and mountainous areas of southern China,only less than 2% of the total area was identified as the first priority area;its land-use compositions were analyzed and recommendations on how to enhance ecosystem service were suggested.This approach overcomes the conflict and contradiction issues associated with identifying priority areas in previous studies and solves the problems of high cost or difficult implementation of priority areas.
基金Supported by Science and Technology Planning Project of Hebei Academy of Sciences(11128)Major Science and Technology Planning Project of Hebei Academy of Sciences(11104)
文摘[Objective]This study aimed to assess the vulnerability of ecological environment in Hebei Province.[Method]Based on ArcGIS,by using the dominant factor and maximum limits factor method,we established the sensitivity-reality indicator system and assessment model of the eco-environment vulnerability in Hebei Province to quantitatively evaluate its eco-environment vulnerability,and analyzed its spatial distribution.[Result]The status quo of environmental degradation was inconsistent with the sensitivity of eco-environment in Hebei Province.The area of severely vulnerable region accounted for only 4.1%of total area in Hebei Province,mainly distributed in nine counties or districts of Baxia region,Zhangjiakou,northwestern Hebei,which was covered with mountains and basins,showing bands,which resulted from the vulnerability of soil erosion and land desertification.In addition,the moderately vulnerable region made up 38.4%,having the largest proportion,and mainly distributed in the mountain and basin region in northwestern Hebei,Yanshan Mountain and the most regions of Taihang Mountain,due to the vulnerability of soil erosion.At the same time,there were also large patches of moderately vulnerable region in Bashang and Baxia of Zhangjiakou,owning to the vulnerability of land desertification.Besides,most plains were mildly vulnerable and slightly vulnerable regions,and their areas accounted for 25.1%and 32.4%respectively of total area.[Conclusion]The research could provide scientific references for safeguarding the ecological security and main functional district planing of Hebei Province.
