| 摘要: |
| 契爷石水库是广东省东莞市的一座中型供水水库，为富营养化水体．为改善该水库水质，2002年10月开始从东江调水，以满足供水的水量和水质要求．在调水后的两年期间，对水文、水质和浮游植物种类和数量进行了调查．本文将调查结果与以往(2000年)调查数据进行了对比，分析了调水后该水库水质和浮游植物的特点和调水对水质的影响．调水直接导致TP浓度显著下降，丰水期的TN浓度有一定下降，但调水并没显著降低枯水期TN的浓度．调水后，丰水期水体的叶绿素a浓度有明显的增加，枯水期叶绿素a浓度大大低于调水前．与调水前相比，调水后浮游植物种类数有明显增加，特别是绿藻种类，蓝藻中的假鱼腥藻和针状蓝纤维藻仍为浮游植物优势种，但硅藻中的短小曲壳藻和针杆藻等成为新的优势种，裸藻的数量大为减少． |
| 关键词: 调水 水质 浮游植物群落 契爷石水库 |
| DOI：10.18307/2007.0215 |
| 分类号: |
| 基金项目:教育部骨干教师基金;广东省水文局重点项目 |
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| Water quality and phytoplankton community in the Qiyeshi Reservoir after water diversion from Dongjiang River |
|
OUYANG Hao, HAN Boping
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Institute of Hydrobiology, Jinan University, Guangzhou 510632, P.R.China
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| Abstract: |
| The Qiyeshi Reservoir, located in Dongguan City, Guangdong Province, is a medium sized reservoir for drinking-water supply. To meet the demand in water quantity and water quality, the water was diverged from Dongjiang River to the reservoir in October 2002. In order to understand the ecological effect of this water diversion, the hydrologic conditions, water quality and the distribution of phytoplankton assemblage were surveyed from 2003 to 2004. The results showed that the Total phosphorus (TP) concentration was remarkably diluted by water flushing, however, total nitrogen concentration (TN) only decreased in the flood seasons. In flood seasons, the improvement of light condition in water favored phytoplankton growth, leading to the increase in phytoplankton abundance and biomass. In dry seasons, phytoplankton abundance decreased largely due to the dilution by huge amount of transported water into the reservoir. The water diversion also had an impact on species composition of phytoplankton. The species number increased notably, especially for chlorophyta. Pseudoanabaena sp. and Dactylococcopsis continued to be the dominated species, however, Achnanthaceae and Synedra sp. became one of the dominated species, and the abundance of Phacus stokesi and Trachelomonas sp. decreased remarkably. |
| Key words: Water diversion water quality phytoplankton community Qiyeshi Reservoir |
