摘要
2000—2020年,对淀山湖12个断面开展水体富营养化监测。主要指标高锰酸盐指数、总氮、总磷等呈现先恶化后好转趋势,高锰酸盐指数全湖均值在2004年达到最高,总氮、总磷在2005年达到最高,分别达到7.4、5.3、0.23 mg/L,由最初的《地表水环境质量标准》(GB 3838—2002)Ⅳ类、劣Ⅴ类、Ⅴ类分别提升至Ⅱ类、Ⅴ类、Ⅳ类。2007—2020年,随着高锰酸盐指数、总氮、总磷浓度降低,水体富营养化总体呈减轻态势,但7—9月仍是水华高发期。针对当前淀山湖总氮、总磷不能稳定达标的现状,建议结合年内变化趋势,加强区域合作,进一步削减氮、磷的入湖总量,同时开展长期的生态修复,促进生态良性循环。
12 sampling sections were selected to monitor the eutrophication of Dianshan Lake from 2000 to 2020.The main parameters of water quality improved after an initial deterioration,such as permanganate index,total nitrogen and total phosphorus.The maximum average concentration of permanganate index reached 7.4 mg/L in 2004,while total nitrogen and total phosphorus reached 5.3 and 0.23 mg/L,respectively in 2005.The quality standard of permanganate index improved fromⅣtoⅡ,total nitrogen from belowⅤtoⅤ,and total phosphorus fromⅤtoⅣaccording to“Environmental quality standards for surface water”(GB 3838-2002).Due to the concentrations of permanganate index,total nitrogen and total phosphorus decreasing,the eutrophication level of the lake decreased,but the algal blooms were still severe in July,August and September from 2007 to 2020.It was suggested to strengthen the regional cooperation to reduce the discharge of nitrogen and phosphorus according to the variation within the year since total nitrogen and total phosphorus could not reach aim stably.In the long run,ecological restoration measures should be taken to improve the ecological environment cycle.
作者
伦凤霞
肖群
李强
LUN Fengxia;XIAO Qun;LI Qiang(Shanghai Hydrology Administration,Shanghai 200232)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2023年第6期805-809,816,共6页
Environmental Pollution & Control
基金
上海市水务局科研项目(沪水科2021-10)。
关键词
淀山湖
富营养化
叶绿素A
生态修复
Dianshan Lake
eutrophication
chlorophyll a
ecological resoration
