南湾水库浮游植物群落干扰响应初步研究

Studies on stress response of phytoplankton community in Nanwan Reservoir based on ABC curves

为了更好地研究浮游植物群落对环境扰动的响应,2016年3月、5月和9月在淮河流域南湾水库先后开展了3次浮游植物调查,并同步开展了总氮、总磷、高锰酸盐指数等水质指标监测。通过采用相关性分析、浮游植物丰度-生物量曲线法等方法研究了南湾水库水生态受到的干扰响应过程。结果显示:南湾水库水化学指标和浮游植物种群数量随季节变化显著。除总氮外,大部分指标在3月和9月较低,能达到Ⅱ类或Ⅲ类水质标准。ABC曲线分析则进一步显示浮游植物群落5月受到较大的环境污染扰动,从而导致了9月份处于污染较重阶段。水质指标与浮游植物丰度等参数的相关性分析表明,ABC曲线的变化与高锰酸盐指数、可溶性总磷变化有关,这可能与南湾水库同期库周较强的农业生产活动密切相关。

Three investigations of phytoplankton were carried out in Nanwan Reservoir in Mar.,May and Sept.,2016.Phytoplankton and water samples were collected simultaneously.The common water quality indicators such as total nitrogen,total phosphorus and the permanganate index were analyzed.The stress response was analyzed based on phytoplankton abundance-biomass curves and the relations between water quality and phytoplankton community.The results showed that the water quality indicators changed significantly.Except permanganate index in May,most of the indicators were lower and can meet with Ⅱ or Ⅲ water quality standards.The abundance-biomass curve based on phytoplankton showed that the water body was subjected to a large environmental disturbance in May and reduced to a heavy pollution stage in Sept..Further analysis of the relationship between water quality factors and phytoplankton community showed that organic pollution(permanganate index) is the main pollution factor which was related to the intense agricultural production activities in spring.