Abstract
利用2012年9月5日在官厅水库采集的水体吸收系数数据,对总悬浮颗粒物、浮游植物色素颗粒物、非色素颗粒物和有色可溶性有机物的吸收特性进行研究.结果表明:秋季官厅水库的颗粒物吸收以浮游植物色素吸收为主,总颗粒物吸收光谱与浮游藻类吸收光谱相似;非色素颗粒物和有色可溶性有机物的吸收系数随波长的增大接近指数规律衰减;a<sub>d</sub>(440)、a<sub>d</sub>(675)与C<sub>Chl.a</sub>呈显著相关,表明官厅水库秋季的非色素颗粒物主要来源于浮游藻类降解产物,陆源性输入较少;a ph(440)、a ph(675)与C<sub>Chl.a</sub>存在显著线性关系,但其比吸收系数较为恒定,与C<sub>Chl.a</sub>基本无关;不同采样点的不同组分吸收系数对总吸收系数的贡献不同,大致有4种表现类型.在富营养程度较高的妫库区,浮游植物色素是水体光谱吸收的主导因子;在富营养程度较低的中库区,颗粒物与有色可溶性有机物共同主导水体光谱吸收.;Field work was carried out in Guanting Reservoir on September 5,2012 to study the absorption characteristics of total particulates,phytoplankton pigment,tripton and chromophoric dissolved organic matter (CDOM).The results show that: (1) In autumn,phytoplankton pigment absorption plays a major role in total particulates absorption,thus the absorption of total particulates has the similar characteristics as that of phytoplankton pigment.(2) The absorption coefficients of CDOM and tripton decreased exponentially with wavelength increasing.The slope coefficient of tripton absorption spectral Sd is much smaller than that of other eutrophic waters (eg.Lake Taihu,Lake Dianchi,Lake Chaohu).The slope coefficient of CDOM absorption spectral S<sub>g</sub> is similar to Lake Taihu and Lake Chaohu.(3) Significant linear relationship was found between a<sub>ph</sub> (440),a<sub>ph</sub> (676) and C<sub>Chl.a</sub> , but the specific absorption of phytoplankton (a<sub>ph</sub><sup>*</sup>) at 440 nm and 675 nm keeps a stable level and has no obvious relationship with C<sub>Chl.a</sub>.(4) Significant linear relationship was also found between a<sub>d</sub> (440),a<sub>d</sub> (676) and C<sub>Chl.a</sub> ,which indicates tripton in autumn Guanting Reservoir mainly comes from the degra<sub>d</sub>ation of phytoplankton.(5) Absorption coefficients of different components from different sites of Guanting Reservoir show four different types of contributions to the total absorption coefficients.In more eutrophic area (Gui Area),phytoplankton dominates water's light absorption,while in less eutrophic area (Zhong Area),particles and CDOM play the same important roles in light absorption.
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