Absorption properties of dissolved organic matter in East Asian temperate lakes
Absorption properties of dissolved organic matter in East Asian temperate lakes
复制标题
DOI：
10.1007/s10201-023-00722-9
复制
发表时间：
2023-06
期刊：
影响因子：
1.6
通讯作者：
K. Hayakawa;Shn-ichi Nakano;Renhui Li;Fuhong Sun;Fengchang Wu;N. Takei;Koichi Shimotori;A. Imai
中科院分区：
文献类型：
--
作者：
K. Hayakawa;Shn-ichi Nakano;Renhui Li;Fuhong Sun;Fengchang Wu;N. Takei;Koichi Shimotori;A. Imai
关于湿温带湖泊中发色溶解有机物（CDOM）的比较研究很少。在这项研究中，我们检查了从日本和中国温带湖泊采集的水样的紫外线吸收情况。所有湖泊样品中溶解有机碳（DOC）浓度与紫外线吸收系数之间都存在比例关系，表明温带湖泊环境中这两个参数之间的相似性。然而，吸收系数与 DOC 浓度在 295 和 320 nm 范围内的比率在湖泊之间表现出不同的分布，即使在数据集的相似 DOM 成分中也是如此。我们使用两步超滤从过滤水中提取 CDOM 的异质部分。特别是，富营养化湖泊中的低分子量组分具有相对较高的吸收系数与DOC浓度之比。这些分数可以突出不同营养状态湖泊的 CDOM 特征。
There are few comparative studies of chromophoric dissolved organic matter (CDOM) in humid temperate lakes. In this study, we examined the ultraviolet absorption of water sampled from temperate lakes in Japan and China. A proportional relationship was found between the dissolved organic carbon (DOC) concentration and ultraviolet absorption coefficients in all lake samples, indicating similarities between the two parameters in the temperate lake environments. However, the ratios of absorption coefficient to the DOC concentration in the ranges of < 295 and > 320 nm showed different distributions among the lakes, even within similar DOM component of data sets. We used a two-step ultrafiltration to extract the heterogeneous parts of the CDOM from filtered water. In particular, the low molecular weight fractions in the eutrophic lakes had relative high ratios of absorption coefficient to DOC concentration. These fractions can highlight the CDOM characteristics of lakes in different trophic status.