| 摘要: |
| 利用2001-2002年周年太湖全湖不同湖区湖泊光学及表层水样的实测资料，分析了太湖水体表层光学衰减系数与透明度、无机和有机颗粒物质及叶绿素a的相关关系，建立了表层水光学衰减系数与无机、有机颗粒物质及叶绿素a多元线性回归方程。结果表明，光学衰减系数与透明度的关系为：Kd=0.096+1.852/ST；表层水光学衰减系数与无机、有机颗粒物质及叶绿素a多元线性回归方程为：Kd=0.219+0.0768Ciss+0.214Cdet+0.006Cchl；光学衰减系数变化的主要影响因子是无机及有机颗粒物。 |
| 关键词: 光学衰减系数，无机颗粒，有机颗粒，叶绿素a |
| DOI： |
| 分类号: |
| 基金项目:中国科学院知识创新工程项目，KZCX1-SW12号和KZCX2-311号 |
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| REGRESSION ANALYSIS OF BEAM ATTENUATION COEFFICIENT UNDER WATER IN LAKE TAIHU |
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ZHANG Yun-Lin1,2, QIN Bo-Qiang1, CHEN Wei-Min1, YANG Ding-Tian1,2
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1.Nanjing Institute of Geography&Limnology，Chinese Academy of Sciences;2.School of Postgraduate，Chinese Academy of Sciences
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| Abstract: |
| The effects of the most important factors contributing to the attenuation of light under water in Lake Taihu were described．Empirical relations and differences in the attenuation coefficient，secchi disc transparency，total suspended matter，organic an d mineral contents of the suspended matter and chlorophyll a were analyzed in Lake Taihu water，based on the in situ investigation data obtained during the period from 2001 to 2002． The multiple linear regression formula is presented including the attenuation coefficient，inorganic suspended matter，organic suspended matter and chlorophyll a．The results are thus：the attenuation coefficient and secchi disc transparency are illustrated below Kd=0.096+1.852/ST；The multiple regression equation based on the surface water samples is：Kd=0.219+0.0768Ciss+0.214Cdet+0.006Cchl．In large，shallow lakes such as Lake Taihu，the largest contribution to under water light attenuation often originates not from phytoplankton but from suspended matter． The contribution of chlorophyll a to the attenuation coefficient is higher in eutrophic zones during periods of algae bloom． |
| Key words: Beam attenuation coefficient,Inorganic suspended matter,Organic suspended matter,Chlorophyll a |
