长江口及毗邻海域生态系统健康评价研究

Ecosystem health assessment for the Changjiang River Estuary and its adjacent sea area

借鉴压力-状态-响应指标结构模型,构建了长江口及毗邻海域的由年径流量波动比、年泥沙量波动比、入海段面CODMn、DO超标率、COD超标率、DIN超标率、DIP超标率、底栖动物多样性指数、浮游动物桡足类密度比例、浮游植物甲藻种类比例、类大肠菌群超标率等22个敏感指标组成的评价指标体系,并采用5级评价标准,建立了基于最大熵的河口生态系统健康模糊评价模型。运用该模型对长江口生态系统健康的现状、变化趋势进行评价分析,结果表明,目前长江口处于亚健康状态。本文可为长江口综合整治及其他河口同类生态建设工程提供参考。

Referring to the pressure-state-response （PSR） indicator structure model developed by the OECD and UNEP, the ecosystem health assessment for the Changjiang Estuary was carried out. The assessment index system involved 22 indicators, such as annual run-off fluctuation rate, annual sediment fluctuation rate, CODMo of sea surface, DO over standard rate, COD over standard rate, DIN over standard rate, DIP over standard rate, benthic diversity index, zooplankton copepods density ratio, and phytoplankton species of algae and fecal coliforms over the standard rates, etc. Five levels of assessment criteria were suggested. The ecosystem health status and developing trend of the Changjiang River estuary and its adjacent sea area were analyzed by using the FAME model which is established based on maximum entropy. The re- sults show that the ecosystem is in the sub-healthy state.