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中文摘要：
通过长江中下游45个湖泊不同季节水体占δ^18O分析，对湖泊水体演化过程进行了研究。结果表明，湖泊水体δ^18O主要反映了湖泊水源变化及湖泊水体与长江洪水期／枯水期交替演变的特征关系。受江湖关系随季节变化影响，处于长江中下游中段安徽省境内的巢湖、石塘湖等湖泊各季节水体δ^18O都相对较高，处于上段和下段的鄱阳湖群和太湖湖群湖泊水体δ^18O相对较低。因此，长江中下游上段和下段湖泊水体交换受长江影响较大，中段较小。对不同季节湖泊水体δ^18O比较分析表明，长江对湖泊水体的影响主要在夏季，秋、冬季节湖泊水体稳定。黄盖湖、大冶湖等湖泊夏、秋两季水体δ^18O大幅度变化与长江的水位波动直接有关，在长江洪水期，湖泊与长江相连;在长江枯水期，湖泊与长江分离。玄武湖水体δ^18O的大变幅是人为捷水造成的。
英文摘要：
Pollution and eutrophication are the severe environmental problems lakes along the mid-lower reaches of the Yangtze River are faced with. Recently oxygen isotope of the water bodies has been widely applied to tracing the evolution and sources of the water bodies, transformation among precipitation, surface water and ground water and sources of pollutions. Based on the analysis of δ^18O in 45 lakes along the mid-lower reaches of the Yangtze River, the evolution process of lake waters was studied. The results show that δ^18O shifts in lake waters reflect the variations of water sources of the lakes, and the relations of alternative evolution between lake waters during flood season and dry season of the Yangtze River. δ^18O values for Chaohu Lake and Shitang Lake in AnhUi Province, which lie in the middle mid-lower reaches of the Yangtze River are relatively high, whereas those of Poyang and Taihu Lakes that respectively lie in the upper and lower reaches are much lower due to the influence of water changes in seasons. Therefore, the Yangtze River has much greater effect on the lake water exchanges in the upper and lower reaches than in the middle. By the comparison of δ^18O values in lakes, we conclude that the influence of the Yangtze River on the lakes is obvious during summer months, but lake waters are stable during autumn and winter months. The broad range of δ^18O shifts of Huanggai Lake and Daye Lake during summer and autumn is directly related to the fluctuation of water level of the Yangtze River. The lakes are connected to the Yangtze River during its flood season, whereas they are separated from the river during dry season. Moreover, the great transformation of δ^18Oin Xuanwu Lake is caused by artificial water exchange.
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