中文摘要：

通过对2007年9月底和10月初湖北东湖、梁子湖、洪湖水体中悬浮颗粒物的吸收系数进行研究,系统分析了3个湖泊水体中颗粒物吸收系数变化规律及影响因素。结果表明：总颗粒物吸收表现出明显浮游植物吸收特征,反映颗粒物中浮游植物贡献比较高;东湖和梁子湖吸收系数显著大于洪湖,表明东湖和梁子湖水下光场条件不如洪湖。武汉东湖各点颗粒物吸收系数变化不大,而梁子湖和洪湖各点则存在较大空间差异。3个湖泊非藻类颗粒物吸收光谱谱型一致,随波长增加大致按指数规律衰减。武汉东湖、梁子湖、洪湖指数函数斜率平均值分别为12.31±0.32μm-1、11.96±0.84μm-1、11.98±1.68μm-1。浮游植物特征波长的吸收系数与浮游植物色素浓度具有显著性正相关,可以通过色素浓度测定反推浮游植物吸收系数。总颗粒物、非藻类颗粒物吸收系数与总悬浮物、有机颗粒物、无机颗粒物均存在显著性正相关。浮游植物吸收系数与有机颗粒物也有很好的线性相关,证明有机颗粒物主要以浮游植物为主。

英文摘要：

The spectral absorption coefficients of particulate matter in Lake Donghu,Lake Liangzihu and Lake Honghu were studied based on the data collected on 27 September and 1~3 October 2007.The absorption spectra of total particulates were similar to those of phytoplankton,suggesting that phytoplankton accounted for a large contribution of particulate matter.Significant higher absorption coefficients were recorded in Lake Donghu and Lake Liangzihu than in Lake Honghu,indicating that the underwater climate was better in Lake Honghu than in Lake Donghu and Lake Liangzihu.Larger spatial differences of particulate matter absorption coefficients were found in Lake Liangzihu and in Lake Honghu than in Lake Donghu.The absorption spectra of nonalgal particles of the three lakes showed the same pattern,following an exponential increase toward short wavelengths with an average slope of 12.31±0.32 μm-1,11.96±0.84 μm-1,11.98±1.68 μm-1 over the 400~700 nm interval in Lake Donghu,Liangzihu and Honghu,respectively.Significant positive relationships were found between phytoplankton absorption coefficients aph（440）,aph（675） and phytoplankton pigment concentration（p0.005）,suggesting that phytoplankton absorption coefficients could be calculated from phytoplankton pigment concentration.There were significant correlations between total particulate matter,non-algal particulate absorption coefficients and the concentrations of total suspended solids,organic suspended solids,inorganic suspended solids.A significant linear relationship was found between phytoplankton absorption coefficients and organic suspended solids concentration,suggesting phytoplankton dominated in organic suspended solids.