A kind of method and its application for urban ecosystem health assessment

Set Pair Analysis Method(SPAM) was employed to assess the health of urban ecosystems. This assessment method led to dialectic and actual results because it objectively treats and systematically estimates the uncertainty of urban system. Multiple health indexes of urban ecosystems can be combined to form a relative-close-degree of urban ecosystem health to the optimal evaluation set, through SPAM. The urban ecosystem health of Beijing, Dalian, Shanghai, Wuhan, Xiamen and Guangzhou from 1995 to 2003 were evaluated by using SPAM. It can be concluded that the urban ecosystem health of Xiamen and Guangzhou city was the best, while the order of the rest cities' ecosystem health often changed with time. Moreover, the change of Beijing's urban ecosystem health from 1992 to 2003 was analyzed. It showed that Beijing urban ecosystem health had increased in the period.