淮河流域(河南段)水库型水源地富营养化风险评价及藻华限制性因素分析

Eutrophication risk analysis and limiting factors on algal bloom for water resource reservoirs of the Huaihe River Basin in Henan Section

分别于2012年和2013年夏季对河南省省辖淮河流域13座水库水生态系统状况进行了2年的连续调查,采用富营养化评价模型及广义加性模型等方法,基于淮河流域(河南段)水库型水源地的理化及生物调查数据,进行了水库型饮用水源地的富营养化风险评价和藻华限制性因素分析。结果表明,淮河流域(河南段)水库2012年平均处于轻度富营养化状态,2013年则整体处于中营养状态,总磷浓度降低是富营养化状态改善的关键原因。淮河流域(河南段)水库浮游植物藻类生长主要受磷限制,磷浓度的升高提高藻华发生的风险,因此应重点降低水库磷营养盐的输入量,从而降低水库富营养化风险,保障饮用水安全。

In this paper,based on the physical,chemical and biological field data in water resource reservoirs collected in 2012 and 2013,the research assessed the eutrophication risk and analyzed the influence factors on algal blooms in Huaihe River Basin(Henan section)with the eutrophication risk model and generalized additive model.Results showed that the reservoirs were generally at light eutrophic state in 2012,while at mesotrophic state in 2013,which was possibly caused by the reduced total phosphorus concentration.Algae phytoplankton growth was mainly restricted by total phosphorus and increased total phosphorus concentration would raise the risk of algal blooms.To reduce the risk of the reservoir eutrophication and ensure the safety of drinking water resources in these regions,the input amount of total phosphorus nutrient to the reservoirs should be controlled first.