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Human activities determine quantity and composition of dissolved organic matter in lakes along the Yangtze River

机译：人类活动决定了长江沿岸湖泊中溶解性有机物的数量和组成

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Dissolved organic matter (DOM) plays important roles in the aquatic biogeochemical cycle and the global carbon cycle. However, it is highly spatially and temporally varied due to complex sources from the catchment (allochthonous) and from within the system (autochthonous). Satellite remote sensing provides the ability to monitor DOM and identify the spatio-temporal variations in lakes on a global or regional scale. In this study, field work was conducted in 55 lakes in August 2012 along the middle and lower reaches of the Yangtze River (MLR-YR), where most lakes were characterized by eutrophication due to intense human activities. The results showed that both colored DOM (CDOM) and total DOM differed significantly by and were linearly related to the human-induced trophic state index (TSI), with R-2 = 0.41 and 0.61, respectively. Autochthonous substances by phytoplankton contributed to 38.5% of CDOM and 35.2% of DOM, and allochthonous terrestrial substance indexed by land cover change and aquaculture contributed to almost half, with 49.7% of CDOM and 49.8% of DOM. In total, human activities explained as much as 81.7% and 87.5% of the variations in CDOM and DOM, respectively. Finally, a flowchart for estimating DOM from satellite-derived TSI was proposed. This study has great significance for synchronously monitoring and managing aquatic environment quality in regional eutrophic lakes around the world. (C) 2019 Elsevier Ltd. All rights reserved.
机译：溶解有机物（DOM）在水生生物地球化学循环和全球碳循环中起着重要作用。但是，由于集水区（杂乱的）和系统内部（土生的）的复杂来源，其时空变化很大。卫星遥感技术能够监测DOM并确定全球或区域范围内湖泊的时空变化。在这项研究中，2012年8月，在长江中下游地区（MLR-YR）的55个湖泊中进行了野外工作，这些湖泊中大多数湖泊由于人类活动频繁而富营养化。结果表明，彩色DOM（CDOM）和总DOM两者之间存在显着差异，并且与人类诱导的营养状态指数（TSI）呈线性关系，R-2分别为0.41和0.61。浮游植物产生的自生物质占CDOM的38.5％和DOM的35.2％，以土地覆盖变化和水产养殖为指标的陆生物质占近一半，分别为CDOM的49.7％和DOM的49.8％。总体而言，人类活动分别解释了CDOM和DOM变异的81.7％和87.5％。最后，提出了从卫星TSI估算DOM的流程图。这项研究对于同步监测和管理世界各地富营养化湖泊的水环境质量具有重要意义。 （C）2019 Elsevier Ltd.保留所有权利。

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