生态不安全指数

生态不安全指数

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Initial contribute: 2018-12-04

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岳天祥编著
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yue@lreis.ac.cn
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生态不安全指数

      Xi(i=1,2,3,…,n)为第i评价指标的指标值,P(Ci)Ci为指标号)为第i指标的不安全指数,0PCi)≤1XSi为评价指标的指标值,则:

(1) 对于越大越安全的指标:

        若以安全值为指标值:如XiXSi,则PCi=0;如Xi<XSi,则P(Ci)=1-XSi/Xi×100%;②若以不安全值为指标值:XiXSi,则P(Ci)=1;如Xi>XSi,则P(Ci)=Xi/XSi×100%

(2) 对于越小越安全的指标:

  若以安全值为指标值:如XiXSi,则PCi=0;如Xi>XSi,则P(Ci)=1-XSi/Xi×100%;②若以不安全值为指标值:XiXSi,则P(Ci)=1;如Xi<XSi,则P(Ci)=Xi/XSi×100%

(3) 嘉兴市生态不安全指数计算公式:

                 

参考文献:

     吴国庆:区域农业可持续发展的生态安全及其评价研究。自然资源学报,2001,163

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《资源环境数学模型手册》 (2018). 生态不安全指数, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/fda2f8fb-8a38-4d1d-817d-9829b6ec9366
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tingxin
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Initial contribute : 2018-12-04

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Authorship

:  
岳天祥编著
:  
yue@lreis.ac.cn
:  
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Last modifier
tingxin
Last modify time
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