针对云贵高原岩溶生态脆弱区域内农户生计安全分析和研究的不足,选取马关县为研究区,基于英国国际发展署(UK Department for International Development,DFID)提出的可持续生计分析框架(Sustainable Livelihood Framework,SLF)的核心—...针对云贵高原岩溶生态脆弱区域内农户生计安全分析和研究的不足,选取马关县为研究区,基于英国国际发展署(UK Department for International Development,DFID)提出的可持续生计分析框架(Sustainable Livelihood Framework,SLF)的核心——生计资本,选取了包括人均耕地面积、人均纯收入等14个生计资本评价因子,建立研究区农户生计资本安全评价指标体系,测算得到研究区的农户生计安全指数。基于GIS空间显示功能及空间分析功能,对评价结果进行空间分异分析,划分农户生计安全等级,并针对不同生计安全等级的具体情况,提出建设性发展建议,为研究区内生计发展的可持续提供理论依据。研究结果表明:各生计安全等级在全县分布都较分散,需要根据各村的实际情况做出政策调整和发展规划。展开更多
In karst regions,the spatial heterogeneity of soil mineral oxides and environmental variables is still not clear.We investigated the spatial heterogeneity of SiO2,Al2O3,Fe2O3,CaO,MgO,P2O5,K2O,and MnO contents in the s...In karst regions,the spatial heterogeneity of soil mineral oxides and environmental variables is still not clear.We investigated the spatial heterogeneity of SiO2,Al2O3,Fe2O3,CaO,MgO,P2O5,K2O,and MnO contents in the soils of slope land,plantation forest,secondary forest,and primary forest,as well as their relationships with environmental variables in a karst region of Southwest China.Geostatistics,principal component analysis(PCA),and canonical correlation analysis(CCA)were applied to analyze the field data.The results show that SiO2was the predominant mineral in the soils(45.02%–67.33%),followed by Al2O3and Fe2O3.Most soil mineral oxide components had a strong spatial dependence,except for CaO,MgO,and P2O5in the plantation forest,MgO and P2O5in the secondary forest,and CaO in the slope land.Dimensionality reduction in PCA was not appropriate due to the strong spatial heterogeneity in the ecosystems.Soil mineral oxide components,the main factors in all ecosystems,had greater influences on vegetation than those of conventional soil properties.There were close relationships between soil mineral oxide components and vegetation,topography,and conventional soil properties.Mineral oxide components affected species diversity,organic matter and nitrogen levels.展开更多
文摘针对云贵高原岩溶生态脆弱区域内农户生计安全分析和研究的不足,选取马关县为研究区,基于英国国际发展署(UK Department for International Development,DFID)提出的可持续生计分析框架(Sustainable Livelihood Framework,SLF)的核心——生计资本,选取了包括人均耕地面积、人均纯收入等14个生计资本评价因子,建立研究区农户生计资本安全评价指标体系,测算得到研究区的农户生计安全指数。基于GIS空间显示功能及空间分析功能,对评价结果进行空间分异分析,划分农户生计安全等级,并针对不同生计安全等级的具体情况,提出建设性发展建议,为研究区内生计发展的可持续提供理论依据。研究结果表明:各生计安全等级在全县分布都较分散,需要根据各村的实际情况做出政策调整和发展规划。
基金Under the auspices of Chinese Academy Sciences Action Plan for the Development of Western China(No.KZCX2-XB3-10)Major State Basic Research Development Program of China(No.2011BAC09B02)+2 种基金Strategic Priority Research Program-Climate Change:Carbon Budget and Related Issues'of Chinese Academy of Sciences(No.XDA05070404,XDA05050205)National Natural Science Foundation of China(No.31070425,31000224,U1033004)Guangxi Provincial Program of Distinguished Expert in China
文摘In karst regions,the spatial heterogeneity of soil mineral oxides and environmental variables is still not clear.We investigated the spatial heterogeneity of SiO2,Al2O3,Fe2O3,CaO,MgO,P2O5,K2O,and MnO contents in the soils of slope land,plantation forest,secondary forest,and primary forest,as well as their relationships with environmental variables in a karst region of Southwest China.Geostatistics,principal component analysis(PCA),and canonical correlation analysis(CCA)were applied to analyze the field data.The results show that SiO2was the predominant mineral in the soils(45.02%–67.33%),followed by Al2O3and Fe2O3.Most soil mineral oxide components had a strong spatial dependence,except for CaO,MgO,and P2O5in the plantation forest,MgO and P2O5in the secondary forest,and CaO in the slope land.Dimensionality reduction in PCA was not appropriate due to the strong spatial heterogeneity in the ecosystems.Soil mineral oxide components,the main factors in all ecosystems,had greater influences on vegetation than those of conventional soil properties.There were close relationships between soil mineral oxide components and vegetation,topography,and conventional soil properties.Mineral oxide components affected species diversity,organic matter and nitrogen levels.
