Abstract
Seasonal investigations on water environment and plankton were carried out from July 2007 to May 2008 in the four selected regions of Danjiangkou Reservoir(Regions Danjiang,Hanjiang,Qushuikou and Wuqing).Ecosystem health index(EHI) and trophic state index(TSI) were used to assess the ecosystem health state of the reservoir.The results showed that,the health state of the whole reservoir was at medium eutrophication level during the study periods and displayed a decreasing trend spatially as follows: Danjiang,Qushuikou,Hanjiang and Wuqing regions.Besides,the health state of some regions displayed seasonal varitations: It was at medium eutrophication level in the regions of Danjiang and Qushuikou in the whole year;it became worse in Hanjiang region in summer,but medium in other seasons;the state of the Wuqing region was worst or worse in the whole year.Moreover,the comparison of assessment results from the two methods concluded that Danjiangkou Reservoir belonged to response ecosystems,and EHI method was suitable for the assessment of its ecosystem health state.
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