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中文摘要：
在大量调查数据的基础上，分析了太湖水质的时空分异特征，探讨了太湖不同湖区、不同季节水质差异的原因。研究结果显示：北部的入湖河口区、几个湖湾、湖心区、西南湖区、东部湖区水体的透明度、高锰酸盐指数、氮、磷、叶绿素等富营养化指标差异显著。入湖河口区的高锰酸盐指数和营养盐含量高于南部湖区数倍，也明显高于北部湖湾区，这反映出太湖西北部人湖河道污染对太湖影响显著。不同季节太湖水质指标也差异显著，冬春期（12～次年5月份）水体的氮含量高于夏秋季（6～11月份）近1倍。水质季节性的显著差异进一步说明了外源输入对太湖水质的影响。研究表明太湖水质的时空异质性既受太湖湖泊形态特征本身的影响，也更多受到外源污染的影响，解决太湖的蓝藻水华问题，首先要在太湖的外源污染控制方面取得突破。
英文摘要：
To clarify the pollution sources and the influence on algae bloom（cyanobacterial blooms）in Lake Taihu,the third largest fresh water lake of China,the spatio-temporal pattern of water environmental indicators of the lake, such as transparency, permanganate index, nitrogen and phosphorus concentrations, and chlorophyll concentration,was analyzed based on the monthly investigating data in 32 sample sites during 2005 to 2007. The spatial different among different areas of the lake was significant. The inflow mouths of several rivers in the northwest of the lake contented a lot of nutrients, which the permanganate index was several times higher than the east part of the lake. This reflected the strong influence of external pollution on the lake eutrophication and northwest catchments were the main contributor of nutrients of Taihu. The water quality of the lake was also highly varied seasonally. Total nitrogen concentrations, for instance, were averagely doubled in winter and spring than those in summer and autumn, however, total phosphorus and chlorophyll showed significantly high values during May to September. During summer, chlorophyll concentration showed a significant positive relationship with total nitrogen, total phosphorus concentration and with permanganate index, which suggested that the nutrients and organic pollution during summer have promoting influence on cyanobacterial bloom. The research suggested that both the morphological characteristics（for example, large surface area combined with extreme shallowness, the distribution of inflow rivers）and the external input from northwest of the lake were the main reasons of the spatio-temporal eu- trophic pattern of Lake Taihu. It also indicated that external pollution still was the main reason for the development of cyanobacterial blooms in Taihu. Strictly control and efficiently decrease the external pollution was the first step and the only choice for bloom control. And,to solve the cyanobacterial bloom of the lake, the external pollution from north
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