DOI: 10.1029/2012GB004453
Scopus记录号: 2-s2.0-84881040657
论文题名: Terrestrial dominance of organic matter in north temperate lakes
作者: Wilkinson G ; M ; , Pace M ; L ; , Cole J ; J
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 1 起始页码: 43
结束页码: 51
语种: 英语
英文关键词: aquatic organic matter
; carbon cycling
; hydrogen isotopes
; terrestrial inputs
Scopus关键词: Aquatic consumers
; Carbon cycling
; Dissolved organic matters
; Eutrophic lakes
; Hydrogen isotope
; Particulate organic matters
; Stable isotopes
; terrestrial inputs
; Biogeochemistry
; Biological materials
; Carbon
; Carbon dioxide
; Hydrogen
; Isotopes
; Organic compounds
; Lakes
; allochthon
; aquatic ecosystem
; carbon cycle
; carbon dioxide
; carbon isotope
; chemical composition
; decomposition
; dissolved organic matter
; dominance
; hydrogen isotope
; organic matter
; particulate organic matter
; pH
; stable isotope
; temperate environment
; terrestrial environment
; Michigan
; United States
; Wisconsin
英文摘要: Aquatic ecosystems are hotspots of decomposition and sources of carbon dioxide to the atmosphere that are globally significant. Carbon exported from land (allochthonous) also supplements the carbon fixed by photosynthesis in aquatic ecosystems (autochthonous), contributing to the organic matter (OM) that supports aquatic consumers. Although the presence of terrestrial compounds in aquatic OM is well known, the contribution of terrestrial versus aquatic sources to the composition of OM has been quantified for only a handful of systems. Here we use stable isotopes of hydrogen and carbon to demonstrate that the terrestrial contribution (ΦTerr) to particulate organic matter (POM) is as large or larger (mean = 54.6% terrestrial) than the algal contribution in 39 lakes of the northern highlands region of Wisconsin and Michigan. Further, the largest carbon pool, dissolved organic matter (DOM), is strongly dominated by allochthonous material (mean for the same set of lakes approximately 100% terrestrial). Among lakes, increases in terrestrial contribution to POM are significantly correlated with more acidic pH. Extrapolating this relationship using a survey of pH in 1692 lakes in the region reveals that, with the exception of eutrophic lakes, most of the OM in lakes is of terrestrial origin. These results are consistent with the growing evidence that lakes are significant conduits for returning degraded terrestrial carbon to the atmosphere. ©2012. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77635
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Science, University of Virginia, 291 McCormick Rd., Charlottesville, VA 22904, United States; Cary Institute of Ecosystem Studies, Millbrook, NY, United States
Recommended Citation:
Wilkinson G,M,, Pace M,et al. Terrestrial dominance of organic matter in north temperate lakes[J]. Global Biogeochemical Cycles,2013-01-01,27(1)