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中文摘要：
真光层是浮游植物进行光合作用的水层，真光层反演有利于初级生产力的进一步估算．利用2007-01—07和2006—08—01两期陆地卫星TM数据与同步水质参数数据，建立太湖水体非色素颗粒物浓度和叶绿素a浓度的反演模型，反演出太湖冬、夏两季的非色素颗粒物、叶绿素a浓度．然后根据在太湖建立的真光层深度与非色素颗粒物、叶绿素a浓度之间的关系模型，计算得到太湖冬、夏两季真光层深度空间分布．结果表明，就整个湖区而言，冬季真光层深度变化范围为0．27—2．28m，均值为0．56±0．22m，夏季真光层深度变化范围为0．21—2．03m，均值为0．98±0．24m．从空间上看，冬季时真光层深度的变化规律为：南太湖〈西部沿岸〈湖心区〈胥口湾〈贡湖湾〈梅梁湾〈东太湖〈竺山湾；夏季时的变化规律为：西部沿岸〈梅梁湾〈东太湖〈湖心区〈贡湖湾〈竺山湾〈南太湖〈胥口湾．从季节上看，夏季真光层深度显著大于冬季，但不同湖区真光层深度季节变化也存在一定差异，其中梅梁湾、贡湖湾、西部沿岸、湖心区、胥口湾、南太湖夏季真光层深度大于冬季，而竺山湾和东太湖夏冬变化则不是很明显．
英文摘要：
The euphotic zone is defined as the layer where net phytoplankton production is positive. Therefore, determination of the euphotic depth is useful for estimating primary production. The TM data on 2007-01-07 and 2006-08-01, accompanied by real-time water quality parameters including concentrations of tripton and chlorophyll-a （Chl.a） in Lake Taihu, were used to develop quantitative retrieval models of tripton and Chl.a. Euphotic depth was calculated using the model developed in Lake Taihu based on the concentrations of tripton and Chl.a. The euphoric depth ranged from 0.27 to 2.28m （mean 0.56 ± 0.22m） in winter depth from 0.21 to 2.03m （mean 0.98 ± 0.24m） in the summer. In the winter, the euphotic depths showed spatial distributions which were ordered as ： the south of Lake Taihu 〈 the west coast of Lake Taihu 〈 the lake center 〈 Xukou Bay 〈 Gonghu Bay 〈 Meiliang Bay 〈 East Lake Taihu 〈 Zhushan Bay. In summer, the order changed as follows： the west coast of Lake Taihu 〈Meiliang Bay 〈 East Lake Taihu 〈 the lake center 〈 Gonghu Bay 〈 Zhushan Bay 〈 the south of Lake Taihu. Seasonally, the euphotic depth was significantly shallower in summer than in winter; however, seasonal variation differed among areas of the lake. Euphotic depths in Meiliang Bay, Gonghu Bay, the west coast of Lake Taihu, the lake center, Xukou Bay and the south of Lake Taihu were higher in the summer than in the winter, but no marked seasonal variations were found in Zhushan Bay and East Lake Taihu.
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