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巢湖秋冬季水体生物光学特性对比研究

Keywords: 巢湖,光学特性,衰减系数,悬浮物,溶解性有机碳,叶绿素a

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Abstract:

基于2002—2003年秋、冬2季原位水下光场观测资料,分析了巢湖不同湖区水体的生物光学特性,探讨了水下辐照度光谱分布,光衰减系数的光谱分布、季节变化及湖区分布,影响光衰减系数的主要因子。结果表明,水表面光谱最强出现在550~560nm绿光波段,水下光谱在紫光波段衰减最强烈,其次是蓝、绿光,红光衰减最弱,随着深度增加,绿、红光在整个光谱成分中比例越来越高;秋季360~750nm波段衰减系数在1.29~11.66m-1间变化,冬季在1.56~18.01m-1间变化;光衰减系数的空间分布是位于巢湖东部的C4点要好于中西部的C1—C3;光学衰减系数随着波长的增加大致呈下降趋势,但到近红外又有所增加;衰减系数跟悬浮物的相关性最好,平均相关系数平方为0.55,其次是溶解性有机碳,为0.32,跟叶绿素a的相关性最弱,仅为0.27,衰减系数与悬浮物、溶解性有机碳、叶绿素a的多元线性回归在短波部分要好于长波部分。

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