As an abstract study conception,most researches of ecological security generally are macro-scale theoretical study with a regional,national or global perspective.Micro-scale research mainly concentrates on ecological ...As an abstract study conception,most researches of ecological security generally are macro-scale theoretical study with a regional,national or global perspective.Micro-scale research mainly concentrates on ecological risk,ecosystem health and ecosystem safety.In order to assess regional ecological security and to accomplish the transition from micro-scale to macro-scale research,a Driving-Function-State-Output-Respond model framework(DFSOR model) is put forward in this paper according to the analyses on regional population,society,economy,re-sources,environment and ecological risks.In empirical research an index system is set out to evaluate ecological se-curity of land use.The DFSOR model comprises f ive group of indicators:(1) driving indicators,which include social population pressure and economic pressure;(2) function indicators,which include human function,hydrodynamic function,wind function and gravity function;(3) state indicators,which include soil resources,water resources and land use/land cover;(4) output indicators,which include production output and ecological risk output;(5) response indicators,which are composed of all sorts of policies and measures for improving production of ecosystem.The method and procedure for ecological security evaluation is put forward based on DFSOR model as well.In the case study,Yanchi,the ecotone between agriculture and animal husbandry,is chosen for the study.An index system is built to evaluate ecological security based on the evaluation of regional ecological risks which including sandif ica-tion,water erosion,soil salinization,soil pollution and shortage of water.The comprehensive evaluation result shows the regional ecological security index of land use in the research area increase obviously.But it is still in the state of low-graded danger.展开更多
Environmental risks pertaining to contaminated soils have been well studied,while little attention has been paid to the risks of the soils after remediation. In this study,a concept model developed based on fuzzy set ...Environmental risks pertaining to contaminated soils have been well studied,while little attention has been paid to the risks of the soils after remediation. In this study,a concept model developed based on fuzzy set theory was applied to evaluate the uncertainties of three risk indicators,namely,plant growth,groundwater safety and human health,of a restored site that had been previously polluted by heavy metals. The concept model classified the grade and importance of risk factors by an 11-level ranking system and was able to yield a comprehensive risk result rather than multi-risk results for complex risk indicators. Modeling results showed that the risks to the three indicators were effectively reduced after the remediation. Moreover,great sensitivity of the risks was found related to the weight distribution among the three risk indicators. In general,the risks of both polluted and restored soils to the environment were in the order of groundwater safety > plant growth > human health. The model was proved to solve the problems of multi-risk results due to complex risk indicators that previously encountered by other researchers,which made it helpful in decision-making and management of restored soils.展开更多
基金supported by the National Key Technologies R&D Program of China during the 10th Five-Year Plan Period (Grant No. 2002BA517A114)National Key Technologies R&D Program (Grant No. 2007BAB23C03).
文摘As an abstract study conception,most researches of ecological security generally are macro-scale theoretical study with a regional,national or global perspective.Micro-scale research mainly concentrates on ecological risk,ecosystem health and ecosystem safety.In order to assess regional ecological security and to accomplish the transition from micro-scale to macro-scale research,a Driving-Function-State-Output-Respond model framework(DFSOR model) is put forward in this paper according to the analyses on regional population,society,economy,re-sources,environment and ecological risks.In empirical research an index system is set out to evaluate ecological se-curity of land use.The DFSOR model comprises f ive group of indicators:(1) driving indicators,which include social population pressure and economic pressure;(2) function indicators,which include human function,hydrodynamic function,wind function and gravity function;(3) state indicators,which include soil resources,water resources and land use/land cover;(4) output indicators,which include production output and ecological risk output;(5) response indicators,which are composed of all sorts of policies and measures for improving production of ecosystem.The method and procedure for ecological security evaluation is put forward based on DFSOR model as well.In the case study,Yanchi,the ecotone between agriculture and animal husbandry,is chosen for the study.An index system is built to evaluate ecological security based on the evaluation of regional ecological risks which including sandif ica-tion,water erosion,soil salinization,soil pollution and shortage of water.The comprehensive evaluation result shows the regional ecological security index of land use in the research area increase obviously.But it is still in the state of low-graded danger.
基金Supported by the National Natural Science Foundation of China(Nos.41171374 and 41101483)the Fundamental Research Funds for the Central Universities of China(No.101gzd10)+1 种基金the National Science Foundation for Distinguished Young Scholars of China(No.41225004)the National High Technology Research and Development Program of China(No.2012-AA-06A202)
文摘Environmental risks pertaining to contaminated soils have been well studied,while little attention has been paid to the risks of the soils after remediation. In this study,a concept model developed based on fuzzy set theory was applied to evaluate the uncertainties of three risk indicators,namely,plant growth,groundwater safety and human health,of a restored site that had been previously polluted by heavy metals. The concept model classified the grade and importance of risk factors by an 11-level ranking system and was able to yield a comprehensive risk result rather than multi-risk results for complex risk indicators. Modeling results showed that the risks to the three indicators were effectively reduced after the remediation. Moreover,great sensitivity of the risks was found related to the weight distribution among the three risk indicators. In general,the risks of both polluted and restored soils to the environment were in the order of groundwater safety > plant growth > human health. The model was proved to solve the problems of multi-risk results due to complex risk indicators that previously encountered by other researchers,which made it helpful in decision-making and management of restored soils.
