湖库富营养化敏感分级概念及指标体系研究

Study of Concept and Indicators System on Eutrophication Sensitivity Classification of Lake and Reservoirs

依据水体富营养化的危害程度与地理位置、流动条件等因素有关的概念,在一个较小的尺度上提出了水体富营养化敏感分级的概念,将富营养化的控制级别从河流-湖泊2级扩展到多级,并提出了分级采用的指标体系的一般概念。同时与美国环境保护局的大尺度分区(分级)方法进行了比较分析,发现美国14个生态分区河流与湖库的富营养化基准存在不协调之处,认为以该统计方法分别进行河流与湖库富营养化基准制定,可能产生河流基准的控制指标严于湖泊基准的不合理情况。

Based on the concept that the damaging degrees of eutrophication are related to the geological locations, hydrodynamic status and other conditions, a new concept of eutrophication sensitivity classification at small scale is proposed, which extends the control hierarchy of eutrophication from river-lake two-hierarchy to multi-hierarchy classification system. Meanwhile, the general concepts concerning the indicators system adopted in this hierarchy method are put forward. This method is compared with the large scale hierarchy method given by USEPA. It is pointed out that the nutrient criterions for the rivers ＆ streams and lakes ＆ reservoirs used in the fourteen nutrient ecoregions by USEPA are disharmonious, and the application of the USEPA hierarchy method to establish the nutrient criterions for rivers ＆ streams and lakes ＆ reservoirs will result in unreasonable results probably, that is, the controlling indicators for rivers ＆ streams criterions will be more stricter than those for lakes ＆ reservoirs ones in same ecoregions.