基于水质与浮游生物调查的汉石桥湿地富营养化评价

基于水质与浮游生物的综合调查与评价,可准确判断湿地的富营养化状况.本文以汉石桥湿地为研究对象,设置7个采样点,开展了水质、浮游植物、浮游动物分类监测与调查,并利用营养状态指数法、浮游植物评价法和浮游动物评价法3种方法,评价了水体富营养化状态,比较了各种方法的结果差异.结果表明,3种评价方法的评价结果在时空变化上具有较高的一致性,均显示非核心区富营养化程度较低,核心区富营养化水平较高;各月份相比,10月湿地的富营养化程度较低,6—8月富营养化程度较高.浮游植物和浮游动物评价法所得湿地富营养化程度较营养状态指数法略高,主要表现在4、10月的非核心区评价中.综合水质、浮游植物与浮游动物进行富营养化评价,可得到更为准确的评价结果.

Evaluation of eutrophication for the Hanshiqiao wetland based on water quality and plankton data

Based on the comprehensive survey of water quality and plankton, the eutrophication status of wetlands can be accurately assessed. In the paper, the Hanshiqiao wetland was chosen as the study case, where 7 sampling sites were selected, and the water quality, phytoplankton and zooplankton were monitored and surveyed. Three methods, i.e., trophic-state-index based method, phytoplankton based method, and zooplankton based method, were adopted for eutrophication evaluation of the wetland, and the results were compared under the three methods. The following results were obtained. The eutrophication evaluation results under the three methods were highly consistent both spatially and temporally. Spatially, the eutrophication level in the non-core area was lower than that in the core area. Temporally, the wetland was at high eutrophication level during June, July and August while it was at low eutrophication level during October. In addition, the eutrophication levels given by the phytoplankton/zooplankton based methods were a little higher than that given by the trophic-state-index based method, especially for the non-corn area during April and October. The case of Hanshiqiao wetland indicated that the comprehensive results given by the three methods can offer more accurate evaluation of eutrophication of wetlands.