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中文摘要：
根据三峡库区2003年10月和2004年4月、7月的水质监测资料，对影响水体富营养化的水质指标以及各指标之间的相关关系进行了分析。结果表明，三峡库区水体中，营养盐指标总体来说处在一种高含量水平，其中上游由泥沙携带输入的污染物质贡献较大。2003年10月，浮游植物数量介于2.02×10^4～31.6×10^4个·L^-1之间，与蓄水前相比无明显变化;2004年4月，浮游植物种类与数量发生了较大变化，部分断面浮游植物数量显著增加，总体介于3.18×10^4～16288×10^4个·L^-1，而总磷、总氮的质量浓度平均值分别为0.080和1.35mg·L^-1，已超过了国际上确定的爆发水华的临界值，偏高的营养盐水平则为浮游植物的生长创造了有利条件。利用2004年7月的水质监测资料，运用相关加权综合营养状态指数法对库区水体营养化状况进行了评价，对各断面的评价结果比较接近。
英文摘要：
Based on water quality monitoring data of the Three Gorges Reservoir in October 2003, in April and July 2004, the water quality indexes affecting eutrophication of water body and the correlation of these indexes, were studied. The results indicated： in general, the nutritious salt in the Three Gorges Reservoir was in high level, which mainly attributed to the contamination by the sediment in the upper stream. In October 2003, the quantities of phytoplankton were between 2.02×10^4 and 31.6×10^4·L^-1. Comparing with before impounding, the quantities did not change obviously. In April 2004, the quantities of phytoplankton increased obviously, being 3.18×10^4-16-288×10^4·L^-1. The mean concentrations of total phosphorus and total nitrogen were about 0.080 and 1.35 mg·L^-1 respectively, and surpassed the critical value of algal bloom internationally. The high nutritious salt provided advantageous conditions for phytoplankton＇ s growth. By analyzing water quality monitoring data in July 2004, using correlation weighted comprehensive nutritional index, the nutritional quality of water body was evaluated, and the results are comparatively close.
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