关键词: 水生态环境, 空间特征, 三峡水库, 富营养化

Abstract: Based on the preliminary investigation in Three Gorges Reservoir (TGR) from 12th to 17th of Oct. 2003 and 17th to 21th of Apr. 2004, this paper studied the aquatic environmental characters at early reserving stage of TGR. The results showed that the exchanging capacity of water body is weakened, organic pollution is relatively light, the concentrations of TN and TP are both quite high which met well enough to algae bloom in TGR and the integrative trophic state of reservoir is medium. According to the variation of the aquatic environmental characters, the water body of TGR could be divided into three kinds of reaches, namely the water fields before the dam, the mainstream reach in the middle reservoir, and the tributary reaches of reservoir. In account of the high concentrations of TP and TN, the authors justified that both water temperature and water velocity are the main causal factors in influencing the characters of river reaches in all 3 aspects. Considering the sensitivity of eutrophication of 3 different reaches, the authors found evidently that it is sensitive in both the water fields before the dam and the tributary reaches of reservoir, but relatively low sensitive in the mainstream reach in the middle reservoir because of the relatively high water velocity.

Key words: aquatic environment, spatial characteristic, Three Gorges Reservoir (TGR), eutrophication