Li Si-jia, Song Kai-shan, Zhao Ying, Mu Guang-yi, Shao Tian-tian, Ma Jian-hang
Huan Jing Ke Xue. 2016 Jan 15;37(1):112-22.
Field surveys and laboratory analysis were carried out in Chagan Lake and Xinlicheng Reservoir under different salinity conditions in September 2012. In the laboratory, the absorption coefficients of particulates and chromophoric dissolved organic matter (CDOM) were measured, aiming to compare the absorption features, source of optical active substances and relative contribution of optical active constituents over the range of PAR (400-700 nm) in Chagan Lake and Xinlicheng Reservoir. The results showed that the Chagan Lake and Xinlicheng Reservoir were water bodies with medium eutrophication in autumn by TAL nutrient index and the absorption spectra of particulates matters were similar to those of phytoplankton. For the Chagan Lake with high salinity( EC = 988. 87 micro S x cm(-1)), the total particulate absorption was dominated by the nonalgal particles, and the contribution rate was in the order of nonalgal particles > phytoplankton > CDOM. For the Xinlicheng Reservoir with low salinity (EC = 311.67 microS x -cm(-1)), the total particulate absorption was dominated by the phytoplankton, and the contribution rate was ranked as phytoplankton > nonalgal particles > CDOM. Positive correlation was observed between a(p) (440), a(p) (675), a(d) (440) and total suspended matter (TSM), inorganic suspended matter (ISM), organic suspended matter (OSM) and Chl-a respectively in Chagan Lake, with correlation coefficients all above 0.55. Positive correlation was observed between a(p)(440), a(p) (675) and Chl-a (0.77 and 0.85, P < 0.05) , so did a(d) (440) and ISM (0.74, P < 0.01), while negative correlation was observed between a(p) (440) and OSM in the Xinlicheng Reservoir. In terms of Chagan Lake, negative correlation was merely observed between a(g) (440) and OSM (-0.54, P < 0.05) , but not in the Xinlicheng Reservoir. Both Sg, which was calculated by the fitting absorption curve from 250 to 400 nm, and relative molecular weight M showed that Sg[ (0.021 +/- 0.001) m(-1)] in Chagan Lake was greater than that in the Xinlicheng Reservoir [(0.0176 +/- 0.001) m(-1)], and Mr, in Chagan Lake was 11.44 +/- 2.00 (7.5-15.09), which was greater than that in Xinlicheng Reservoir 7.53 +/- 0.79 (6.17-8.89), indicating that the relative molecular weight of CDOM in the Chagan Lake was less than that in the Xinlicheng Reservoir. The Chagan Lake was greatly affected by wind speed and shore collapse to produce suspended mineral and sediment particles. Thereby the total particulate absorption was dominated by the nonalgal particles. The waters in the Xinlicheng Reservoir were greatly impacted by terrestrial inorganic matter, and the growth of phytoplankton was weakened and microbes activities were strengthened simultaneously, which led to the negative correlations between a(g)(lamda) and OSM.
2012年9月，在查干湖和新立城水库不同盐度条件下进行了实地调查和实验室分析。在实验室中，测量了颗粒物质和发色溶解有机物（CDOM）的吸收系数，旨在比较查干湖和新立城水库在光合有效辐射（PAR，400 - 700 nm）范围内光活性物质的吸收特征、来源及光活性成分的相对贡献。结果表明，根据TAL营养指数，查干湖和新立城水库秋季均为中营养水体，颗粒物质的吸收光谱与浮游植物相似。对于盐度较高（EC = 988.87 μS·cm⁻¹）的查干湖而言，总颗粒吸收以非藻类颗粒为主导，贡献率顺序为非藻类颗粒>浮游植物>CDOM。对于盐度较低（EC = 311.67 μS·cm⁻¹）的新立城水库，总颗粒吸收以浮游植物为主导，贡献率排序为浮游植物>非藻类颗粒>CDOM。在查干湖，a(p)(440)、a(p)(675)、a(d)(440)与总悬浮物（TSM）、无机悬浮物（ISM）、有机悬浮物（OSM）和叶绿素a分别呈正相关关系，相关系数均高于0.55。新立城水库中，a(p)(440)、a(p)(675)与叶绿素a呈正相关（相关系数分别为0.77和0.85，P < 0.05），a(d)(440)与ISM呈正相关（相关系数为0.74，P < 0.01），而a(p)(440)与OSM呈负相关。就查干湖而言，仅观察到a(g)(440)与OSM呈负相关（相关系数为 -0.54，P < 0.05），而新立城水库未观察到这种情况。通过对250至400 nm吸收曲线拟合计算得到的Sg以及相对分子量M均表明，查干湖的Sg[（0.021 ± 0.001）m⁻¹]大于新立城水库[（0.0176 ± 0.001）m⁻¹]；查干湖的Mr为11.44 ± 2.00（7.5 - 15.09）大于新立城水库的7.53 ± 0.79（6.17 - 8.89），这表明查干湖CDOM的相对分子量小于新立城水库。查干湖受风速和岸坡崩塌影响较大，产生悬浮矿物和泥沙颗粒，因此总颗粒吸收以非藻类颗粒为主导。新立城水库水体受陆地无机物影响较大，浮游植物生长受到抑制，同时微生物活动增强，导致a(g)(λ)与OSM呈负相关。
