Song Yan Yan, Su Dong Hui, Shao Tian Tian
Key Research Institute of Yellow River Civilization and Sustainable Development &Collaborative Innovation Center on Yellow River Cirilization of Henan Province, Henan University, Kaifeng 475001, Henan, China.
College of Environment and Planning, Henan University, Kaifeng 475001, Henan, China.
Ying Yong Sheng Tai Xue Bao. 2017 Jun 18;28(6):2013-2023. doi: 10.13287/j.1001-9332.201706.022.
The absorption characteristics of optically active constituents (OACs) in water column are important optical properties and basic parameters of establishing the inverse analysis model. Comparative analyses about seasonal variability of the optical absorption characteristics (phytoplankton, non-algal particles and chromophoric dissolved organic matter absorption characteristics) and water quality status of East Liaohe River basin were conducted based on the water samples in Erlong-hu Reservoir collected in June, September and October of 2011 and samples in East Liaohe River in October of 2012. The results demonstrated that the eutrophication status of Erlonghu Reservoir was lower in June, eutrophic in September and moderately eutrophic in October. Some of the sampling points of the East Liaohe River belonged to the middle trophic level and the other part belonged to the eutrophic level. The absorption coefficient of each component of water increased with increasing nutrient level. Besides, the absorption spectra of total suspended particulate of Erlonghu Reservoir in June and October were similar to that of non-algal particles, and chromophoric dissolved organic matter (CDOM) contributed most to the total absorption of water. The absorption spectra of total suspended particulate matter in September were similar to that of phytoplankton and phytoplankton was the dominant contributor to the total absorption. For samples of Erlonghu Reservoir in June and September, a(440) and total phosphorus (TP) were correlated closely with each other. Significant correlation between a(440) and dissolved organic carbon (DOC) of Erlonghu Reservoir in June was observed, while a(440) was only correlated with Chla. There were positive correlations between a(675) and Chla, Carlson index (TLI) in Erlonghu Reservoir (September) and East Liaohe River. Obvious differences of water optical properties were found between river and lake located in the East Liaohe River basin as follows: There were two types of phytoplankton spectra curves of East Liaohe River and the contribution rates of different components varied greatly from sites to sites; Phytoplankton dominated spectral absorption in waters with high nutrition level (Erlonghu Reservoir in September and the East Liaohe River) while CDOM and the particles were both the main components for Erlonghu Reservoir in June and October; CDOM was composed of large-size molecules in waters of Erlonghu Reservoir in June and in the East Liaohe River in October and mainly of small-size molecules in Erlonghu Reservoir in September and October.
水体中光活性成分（OACs）的吸收特性是重要的光学性质，也是建立反演分析模型的基本参数。基于2011年6月、9月和10月在二龙湖水库采集的水样以及2012年10月在东辽河采集的水样，对东辽河流域光学吸收特性（浮游植物、非藻类颗粒和发色溶解性有机物吸收特性）的季节变化及水质状况进行了对比分析。结果表明，二龙湖水库6月的富营养化程度较低，9月为富营养状态，10月为中度富营养。东辽河部分采样点属于中营养水平，另一部分属于富营养水平。水体各组分的吸收系数随营养水平的升高而增大。此外，二龙湖水库6月和10月总悬浮颗粒物的吸收光谱与非藻类颗粒相似，发色溶解性有机物（CDOM）对水体总吸收的贡献最大。9月总悬浮颗粒物的吸收光谱与浮游植物相似，浮游植物是总吸收的主要贡献者。对于二龙湖水库6月和9月的样品，a(440)与总磷（TP）密切相关。6月二龙湖水库a(440)与溶解性有机碳（DOC）之间存在显著相关性，而a(440)仅与叶绿素a（Chla）相关。二龙湖水库（9月）和东辽河的a(675)与Chla、卡尔森指数（TLI）之间存在正相关。东辽河流域的河流和湖泊之间水体光学性质存在明显差异，具体如下：东辽河浮游植物光谱曲线有两种类型，不同组分的贡献率因位点而异；在高营养水平水体（9月的二龙湖水库和东辽河）中，浮游植物主导光谱吸收，而6月和10月的二龙湖水库中CDOM和颗粒都是主要成分；6月二龙湖水库水体和10月东辽河水体中的CDOM由大分子组成，9月和10月二龙湖水库水体中的CDOM主要由小分子组成。
