中文摘要：

在三峡水库试验性蓄水后的2010年3—12月，对其支流小江沿岸的水质进行了监测，分析了总氮、总磷、化学需氧量和叶绿素a等水质因子的时空变化规律以及叶绿素a与水质因子之间的相关关系，评价了水体营养状态。结果表明，总氮、总磷、化学需氧量和叶绿素a含量分别为（1．980±0．119）mg／L、（0．114±0．018）mg／L、（9．520±1．748）mg／L和（23．342±8．810）mg／L，小江沿岸水质达到中度富营养化水平。各水质因子在不同月份存在较大的差异，随沿程采样站点也有所不同，说明沿岸带水质变化不仅仅受时间的影响，与沿岸土壤对营养盐的吸附和析出也存在较为密切的关系；叶绿素a含量与温度、pH、溶解氧、亚硝酸氮和化学需氧量极显著正相关（P〈0．01），与总氮、总磷不具有显著相关性，说明小江沿岸水体有机质的含量是影响水体叶绿素a含量的主要因子。

英文摘要：

The water quality along the Xiaojiang River was monitored from March to December in 2010 after experi- mental impoundment of the Three Gorges Reservoir. The paper anayzed the temporal-spatial variation rules of the water quality factors, including total nitrogen （ TN）, total phosphorus （ TP）, chemical oxygen demand （COD） and chlorophyll a, and the correlation between chlorophyll a and other water quality factors. And it also evaluated the level of eutrophication. The contents of TN, TP, COD and chlorophyll a were （1. 980 ±0. 119） rag/L, （0. 114 ±0.018） mg/L, （9. 520 ±1. 748） mg/L and （23. 342 ±8. 810） mg/L, respectively, indicating that the water quality along the Xiaojiang River was at middle eutrophicated level. The contents of coastal water quality factors were different among different sampling months and sites, which suggested that the coastal water quality was affect- ed not only by seasonal changes but also soil adsorption and precipitation in nutritive salt. The content of chloro- phyll a was significantly positive correlated with water temperature, pH, dissolved oxygen （DO）, nitrite nitrogen （ NO2- -N） and COD, and was not significant correlated with TN or TP, which suggested that the main factors could influence the chlorophyll a was the organic content in water body along the Xiaojing River.