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吸收特性是水体重要的光学特性,也是建立水色反演分析模型的基本参数.本文利用2011年6、9、10月在二龙湖和2012年10月在东辽河的实测数据,通过测定水体营养水平和颗粒物、有色可溶性有机物(CDOM)等光学活性物质的吸收系数,分析了东辽河河湖的光学物质吸收特性和季节变化.结果表明:二龙湖水体9月处于富营养状态,6月营养水平较低,10月则处于中营养水平;东辽河随采样点位置的差异呈现不同程度的富营养化.水体各组分的吸收系数均随营养水平的增加而逐渐增大.6、10月二龙湖水体总悬浮颗粒物吸收光谱与非色素颗粒物吸收光谱相似,在总吸收中占主导作用的是CDOM;9月总悬浮颗粒物吸收光谱则与浮游植物吸收光谱类似,浮游植物的吸收对总吸收的贡献率最大.6、9月二龙湖浮游植物吸收系数[a_(ph)(440)]与总磷(TP)呈正相关,6月二龙湖a_(ph)(440)与溶解有机碳(DOC)呈正相关,非藻类颗粒物吸收系数[a_d(440)]仅与叶绿素a浓度(Chl a)具有相关性.二龙湖(9月)与东辽河a_(ph)(675)均与Chl a、卡尔森指数(TLI)相关性较好.东辽河流域的河湖水体光学特性存在比较明显的差异:东辽河水体的浮游植物吸收光谱曲线展现出了两种不同类型,浮游植物、非藻类颗粒物、CDOM的贡献率随采样点的不同而相差较大;营养水平较高的9月二龙湖与东辽河水体浮游植物主导了水体光谱吸收,而在二龙湖营养水平较低的月份中(6、10月),颗粒物与CDOM共同主导水体光谱吸收;6月二龙湖与10月东辽河水体CDOM的组成为大分子颗粒物,而9与10月其组成更趋向于小分子颗粒物.
Absorption characteristic is an important optical property of water body and also a basic parameter for the establishment of water color inversion analysis model.Based on the measured data of Erlong Lake in June, September and October in 2011 and the Dongliao River in October 2012, (CDOM) and other optical active substances, the absorption characteristics and seasonal changes of optical materials in Dongliaohe River and Lake were analyzed.The results showed that the water body of Erlong Lake was in eutrophic state in September, and the nutrition level in June Low, October is in the level of nutrition; East Liaohe River sampling points with the differences in the location showed varying degrees of eutrophication.The water absorption coefficient of each component with the increase of nutrition level and gradually increased .6, October Erlong Lake The absorption spectrum of total suspended particulate matter in water body is similar to that of non-pigmented particulate matter, and CDOM plays a dominant role in the total absorption. In September, the total suspended particulate matter absorption spectrum is similar to that of phytoplankton. The contribution of phytoplankton absorption to total absorption (A) Phosphorus (440)] and Total Phosphorus (TP) in Erlong Lake in June and September were positively correlated with each other, while a_ (ph) (440) and dissolved organic carbon (A_d (440)] was only correlated with Chl a. Both Erlonghu (September) and Dongliaohe a_ (ph) (675) were related to Chl a, Carlson index (TLI), the optical properties of rivers and lakes in the East Liaohe River Basin have obvious differences: the absorption curve of phytoplankton in the East Liaohe River shows two different types of phytoplankton, non-algal particulate matter and the contribution of CDOM Phytoplankton dominated the spectral absorption of water body in Erlonghu Lake and Dongliaohe River watershed with higher nutrition level in September (June and October) Particulate and CDOM co-dominate the spectral absorption of water. In June, the composition of CDOM in Erlonghu and Dongliaohe waters in October was composed of macromolecules, while the composition in 9 and October tended to be small-molecule particles.