气候变化领域集成服务门户(CCPortal): How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry

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DOI	10.1007/s10533-021-00753-3
	How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry
	Xenopoulos M.A.; Barnes R.T.; Boodoo K.S.; Butman D.; Catalán N.; D’Amario S.C.; Fasching C.; Kothawala D.N.; Pisani O.; Solomon C.T.; Spencer R.G.M.; Williams C.J.; Wilson H.F.
发表日期	2021
ISSN	1682563
起始页码	323
结束页码	348
卷号	154 期号:2
英文摘要	Dissolved organic matter (DOM) is recognized for its importance in freshwater ecosystems, but historical reliance on DOM quantity rather than indicators of DOM composition has led to an incomplete understanding of DOM and an underestimation of its role and importance in biogeochemical processes. A single sample of DOM can be composed of tens of thousands of distinct molecules. Each of these unique DOM molecules has their own chemical properties and reactivity or role in the environment. Human activities can modify DOM composition and recent research has uncovered distinct DOM pools laced with human markers and footprints. Here we review how land use change, climate change, nutrient pollution, browning, wildfires, and dams can change DOM composition which in turn will affect internal processing of freshwater DOM. We then describe how human-modified DOM can affect biogeochemical processes. Drought, wildfires, cultivated land use, eutrophication, climate change driven permafrost thaw, and other human stressors can shift the composition of DOM in freshwater ecosystems increasing the relative contribution of microbial-like and aliphatic components. In contrast, increases in precipitation may shift DOM towards more relatively humic-rich, allochthonous forms of DOM. These shifts in DOM pools will likely have highly contrasting effects on carbon outgassing and burial, nutrient cycles, ecosystem metabolism, metal toxicity, and the treatments needed to produce clean drinking water. A deeper understanding of the links between the chemical properties of DOM and biogeochemical dynamics can help to address important future environmental issues, such as the transfer of organic contaminants through food webs, alterations to nitrogen cycling, impacts on drinking water quality, and biogeochemical effects of global climate change. © 2021, The Author(s).
英文关键词	Biogeochemical processes; Climate change; Dissolved organic matter composition; Ecosystem function; Land use change
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184592
作者单位	Department of Biology, Trent University, Peterborough, ON, Canada; Environmental Studies Program, Colorado College, Colorado Springs, CO 80903, United States; Department of Geography and Regional Research, Geoecology, University of Vienna, Vienna, Austria; Department of Civil and Environmental Engineering, The School of Environmental and Forest Sciences, University of Washington, Seattle, WA 98125, United States; Laboratoire des Sciences du Climat et de l’Environnement, LSCE, CEA, CNRS, UVSQ, Gif-Sur-Yvette, 91191, France; Department of Soil Ecology, Helmholtz Centre for Environmental Research—UFZ, Halle, Germany; Department of Ecology and Evolution, Uppsala University, Uppsala, Sweden; Southeast Watershed Research Laboratory, USDA-ARS, 2316 Rainwater Road, Tifton, GA 31793, United States; Cary Institute of Ecosystem Studies, Millbrook, NY, United States; Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32306, United States; Department of Environmental Scienc...
推荐引用方式 GB/T 7714	Xenopoulos M.A.,Barnes R.T.,Boodoo K.S.,等. How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry[J],2021,154(2).
APA	Xenopoulos M.A..,Barnes R.T..,Boodoo K.S..,Butman D..,Catalán N..,...&Wilson H.F..(2021).How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry.Biogeochemistry,154(2).
MLA	Xenopoulos M.A.,et al."How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry".Biogeochemistry 154.2(2021).