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| Effects on the CODCr, NH3-N and TP capacities in the Xiaojiang River after the impoundment of the Three Gorges Reservoir |
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Abstract After the impoundment of The Three Gorges Reservoir the hydrological condition has been greatly affected in the Xiaojiang backwater, also the water velocity has slowed down significantly. Moreover, water from the Yangtze River pouring into the backwater changed the water pollutant concentration of the background, causing water environment parameters to be greatly different from those in the natural river. Eventually water environmental capacity will be affected greatly. The Xiaojiang area was studied through based on the data from the Water Functional Division and water quality control target, the water total environmental capacity of chemical oxygen demand (CODCr), ammonia nitrogen (NH3-N), total phosphorus (TP) and their monthly values were computed. Monthly water environmental capacity was affected by water discharge, water velocity,water level and water quality target. After the impoundment of the Three Gorges Reservoir, the water environmental capacities of CODCr, NH3-N and TP have reduced approximately 20.59%, 22.22% and 23.08% respectively.The reduction of water environmental capacity is one of the important factors of water eutrophication in the Xiaojiang backwater.
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Received: 25 June 2011
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PENG Cheng-Rong, CHEN Lei, BI Yong-Hong, XIA Chun-Xiang, LEI Yong-Mei, YANG Yi, JIAN Tie-Zhu, HU Zheng-Yu. Effects of flood regulation on phytoplankton community structure in the Xiangxi River, a tributary of the Three Gorges Reservoir[J]. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1863-1871. |
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