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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Dissolved organic carbon and chromophoric dissolved organic matter properties of rivers in the USA
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Dissolved organic carbon and chromophoric dissolved organic matter properties of rivers in the USA

机译：美国河流的溶解有机碳和发色溶解有机物的性质

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Dissolved organic carbon (DOC) concentration and chromophoric dissolved organic matter (CDOM) parameters were measured over a range of discharge in 30 U.S. rivers, covering a diverse assortment of fluvial ecosystems in terms of watershed size and landscape drained. Relationships between CDOM absorption at a range of wavelengths (a _(254), a _(350), a _(440)) and DOC in the 30 watersheds were found to correlate strongly and positively for the majority of U.S. rivers. However, four rivers (Colorado, Colombia, Rio Grande and St. Lawrence) exhibited statistically weak relationships between CDOM absorption and DOC. These four rivers are atypical, as they either drain from the Great Lakes or experience significant impoundment of water within their watersheds, and they exhibited values for dissolved organic matter (DOM) parameters indicative of autochthonous or anthropogenic sources or photochemically degraded allochthonous DOM and thus a decoupling between CDOM and DOC. CDOM quality parameters in the 30 rivers were found to be strongly correlated to DOM compositional metrics derived via XAD fractionation, highlighting the potential for examining DOM biochemical quality from CDOM measurements. This study establishes the ability to derive DOC concentration from CDOM absorption for the majority of U.S. rivers, describes characteristics of riverine systems where such an approach is not valid, and emphasizes the possibility of examining DOM composition and thus biogeochemical function via CDOM parameters. Therefore, the usefulness of CDOM measurements, both laboratory-based analyses and in situ instrumentation, for improving spatial and temporal resolution of DOC fluxes and DOM dynamics in future studies is considerable in a range of biogeochemical studies.
机译：在美国30条河流的一定流量范围内测量了溶解有机碳（DOC）浓度和发色溶解有机物（CDOM）参数，从流域大小和景观排水方面来讲，涵盖了各种河流生态系统。在美国大部分河流中，发现在30个流域的一定波长范围内（a_（254），__（350），__（440））的CDOM吸收与DOC之间的关系呈强正相关。但是，四个河流（科罗拉多州，哥伦比亚，里奥格兰德河和圣劳伦斯河）的CDOM吸收与DOC之间的关系在统计上较弱。这四条河流是非典型的，因为它们要么从五大湖中流失，要么流域内积水大量，它们表现出的溶解有机物（DOM）参数值表示自生或人为来源或光化学降解的异源DOM，因此CDOM和DOC之间的解耦。发现在30条河流中的CDOM质量参数与通过XAD分馏获得的DOM成分指标高度相关，这突出显示了从CDOM测量中检查DOM生化质量的潜力。这项研究建立了从美国大部分河流的CDOM吸收中得出DOC浓度的能力，描述了这种方法无效的河流系统的特征，并强调了通过CDOM参数检查DOM组成以及生物地球化学功能的可能性。因此，在一系列生物地球化学研究中，CDOM测量（基于实验室的分析和原位仪器）在未来研究中对改善DOC通量和DOM动力学的时空分辨率的实用性非常重要。

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