太湖不同湖区生态系统健康评价方法研究

Approaches to ecosystem health assessment of Taihu Lake

摘要: 基于长期的监测资料,计算了表征湖泊生态系统健康的系统能(Ex)、系统能结构(Exst)和生态缓冲容量(|β|)指标,以及湖泊营养状态指数(Its)。结果表明,太湖不同湖区生态系统健康状况差异明显,1998—2001年太湖典型湖区健康状况由好到差的相对顺序为:东太湖、贡湖和湖心区、梅梁湾、五里湖。在此基础上,提出了富营养化浅水湖泊生态系统健康指标阈值和湖泊系统能量健康指数(IEx)及其健康状况分级。经2002、2003年太湖不同湖区实测检验表明,所提出的湖泊系统能量健康指数及其健康状况分级适用于评价太湖不同湖区生态系统健康的区域分异状况。

Abstract: An attempt to apply exergy（Ex）,structural exergy(Ex_st),ecological buffer capacity（（|β|））and trophic state index(I_ts)to the assessment of lake ecosystem health was presented.It was obvious that there were different ecosystem health conditions in different areas of the Taihu Lake.A standard and a comprehensive health index(I_Ex)for evaluating ecosystem health of a shallow eutrophic lake were given.This method were tested in the Taihu Lake from 2002 to 2003.The results indicate that the comprehensive health index and criteria were applicable to evaluating ecosystem health in different areas of the Taihu Lake.