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Table 5

Health evaluations of the Zhangweinan River ecosystem calculated by the improved interval TOPSIS method

Evaluation period1991– 19951996–20002001–20052006–20102011–2015
 0.137 0.145 0.146 0.140 0.146 
 0.085 0.080 0.076 0.083 0.077 
REHI 0.384 0.355 0.343 0.373 0.346 
Evaluation result General–poor Poor–very poor Poor–very poor Poor–very poor Poor–very poor 
Evaluation period1991– 19951996–20002001–20052006–20102011–2015
 0.137 0.145 0.146 0.140 0.146 
 0.085 0.080 0.076 0.083 0.077 
REHI 0.384 0.355 0.343 0.373 0.346 
Evaluation result General–poor Poor–very poor Poor–very poor Poor–very poor Poor–very poor 
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