摘要
在沿海水资源短缺地区,小型抽水型和非抽水型水库在城市和农村供水中发挥着重要的作用。为了解这些水库的富营养化特征,于2006年4、8、12月对3座抽水水库和3座非抽水水库进行采样分析。结果表明,抽水型水库的总磷、总氮和叶绿素a的浓度的平均值均高于非抽水型水库,而透明度低于非抽水型水库。抽水型水库总磷、总氮和叶绿素a的浓度在冬春季高于夏季,而在非抽型水库中其动态相反。抽水型水库浮游植物生物量略高于非抽水型水库。此外,2类水库间的浮游植物组成存在差异:蓝藻门的假鱼腥藻(Pseudanabaene sp.)、铜绿微囊藻(Microcystis aeruginosa)和硅藻门的颗粒直链藻(Aulacosei-ra granulate)是抽水型水库中的优势种属,甲藻(Peridinium sp.)是非抽水型水库的优势种类。抽水型水库的富营养化指数高于非抽水型水库,主成分分析表明,营养盐浓度是影响抽水型水库富营养化状态的主要因子,而温度是影响非抽水型水库的富营养化状态的主要因子。由于抽水入库改变了水体中营养盐浓度和水动力学过程,导致抽水型水库和非抽水型水库的富营养化程度有明显差别,同时表现出不同的季节特征。
In coastal areas short of fresh water resources, pumped- and non-pumped type reservoirs play an important role in both urban and rural drinking water supply. In order to understand the eutrophication characteristics of these reservoirs, three pumped type reservoirs and three nonpumped type reservoirs were investigated in April, August, and December 2006. In pumped type reservoirs, the mean concentrations of total nitrogen, total phosphorus, and chlorophyll a were higher than those in non-pumped type reservoirs, but the mean Secchi disk depth was lower than that in non-pumped type reservoirs. In pumped type reservoirs, the concentrations of total nitrogen, total phosphorus, and chlorophyll a were higher in winter and spring than summer; while in non-pumped type reservoirs, they were in adverse. The phytoplankton biomass was slightly higher in pumped than in non-pumped type reservoirs. The seasonal dynamics of the dominant phytoplankton species were different in the two types of reservoirs. Pseudanabaene sp. , Microcystis aeruginosa, and Aulacoseira granulate were dominant in pumped type reservoirs, while Peridini- um sp. dominated in non-pumped type reservoirs. The eutrophication index of pumped type reservoirs was higher than that of non-pumped type reservoirs. PCA showed that nutrient was the dominating factor affecting the eutrophication in pumped type reservoirs, while temperature was the dominating factor in non-pumped type reservoirs. Pumping water into reservoirs modified the nutrients concentration and hydrologic process in pumped type reservoirs, leading to a significant difference in the eutrophication degree between pumped and non-pumped type reservoirs, and also, different seasonal patterns of eutrophication.
出处
《生态学杂志》
CAS
CSCD
北大核心
2008年第11期1960-1965,共6页
Chinese Journal of Ecology
基金
珠海市科技局重大项目(PC20052040)
国家自然科学基金重点资助项目(U0733007)
关键词
富营养化
小型水库
抽水水库
南亚热带
eutrophication
small reservoir
pumped type reservoir
south subtropics
