摘要
调研结果显示 ,密云水库的营养特征为浮游藻类响应型。浮游藻类的群落结构是绿藻 (Chlorophyta)—硅藻(Bacillariophyta)型。库区水体TN 0 86mg/L ,TP 0 .0 2 2mg/L ,浮游藻类的细胞密度 4 0 5 2 3× 10 4/L。 4项指标 (Tr、TP、CODmn、chla)的TSIM 值 4 0 1— 4 9 6 ,水体为中营养。但TN、TP和浮游藻类细胞密度增长较快 ,水体向富营养发展的趋势明显。主要制约因素是面源、点源和内源对水体的污染。北京市水资源紧缺 ,密云水库是主要饮用水源地。保护流域生态环境 ,治理污染 ,涵养水源 。
Beijng City is short of fresh water seriously.Water resources of every person is about 300m 3.Miyun Reservoir is the chief drinking water resources in Beijing,which influenced people's lives and economic development greatly. In order to know the trophic state and limitative factors on Miyun Reservoir,water quality of the reservoir and the valley's economic situation were investigated.Eight sits(fixed position by GPS)and twelve determinable items were selected in the reservoir and they were water holding capacity,water depth,water temperature,transparency,pH,TN,TP,CODmn,BOD 5,DO,Chlorophyll a and phytoplankton.Two investigations were finished,one in May 2001(dry season)and the other in September 2001(season for rain plenty). The research results indicates that nutrition characteristic of Miyun Reservoir belongs to responding type of phytoplankton.Community structure of phytoplankton belongs to green algae-diatom type. Total nitrogen in water is 0.86mg/L and total phosphorus is 0.022mg/L.The cells density of phytoplankton is 405.23×10 4/L.TSI M of four targets(Tr?TP?CODmn?chla) are from 35.8.to 49.6,water body of the lake has reached mesotrophy.But the TN?TP and cells density of phytoplankton are on the increase,water body tend to be of eutrophication. Primary factors are water and soil erosion in upper reaches of two rivers and pollution of the water body.Miyun Reservoir is principal drinking headwater for Beijing.It is very essential to protect ecological environment of the valley and to harness pollution.
出处
《水生生物学报》
CAS
CSCD
北大核心
2004年第2期191-196,共6页
Acta Hydrobiologica Sinica
基金
国家重点基础研究发展规划项目 (项目编号 :G19990 45 70 5 )资助
关键词
密云水库
浮游藻类
中营养
水源保护
Miyun Reservoir
Phytoplankton
Mesotrophy
Headwater protection
