DOI: 10.1038/ngeo2720
论文题名: Organic carbon decomposition rates controlled by water retention time across inland waters
作者: Catalán N. ; Marcé R. ; Kothawala D.N. ; Tranvik L.J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 7 起始页码: 501
结束页码: 504
语种: 英语
Scopus关键词: aquatic ecosystem
; carbon cycle
; decomposition
; global change
; global climate
; global warming
; half life
; marine ecosystem
; organic carbon
; soil ecosystem
; water retention
英文摘要: The loss of organic carbon during passage through the continuum of inland waters from soils to the sea is a critical component of the global carbon cycle. Yet, the amount of organic carbon mineralized and released to the atmosphere during its transport remains an open question, hampered by the absence of a common predictor of organic carbon decay rates. Here we analyse a compilation of existing field and laboratory measurements of organic carbon decay rates and water residence times across a wide range of aquatic ecosystems and climates. We find a negative relationship between the rate of organic carbon decay and water retention time across systems, entailing a decrease in organic carbon reactivity along the continuum of inland waters. We find that the half-life of organic carbon is short in inland waters (2.5 ± 4.7 yr) compared to terrestrial soils and marine ecosystems, highlighting that freshwaters are hotspots of organic carbon degradation. Finally, we evaluate the response of organic carbon decay rates to projected changes in runoff. We calculate that regions projected to become drier or wetter as the global climate warms will experience changes in organic carbon decay rates of up to about 10%, which illustrates the influence of hydrological variability on the inland waters carbon cycle. © 2016 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105976
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Ecology and Genetics, Uppsala University, Uppsala, Sweden; Catalan Institute ForWater Research, Emili Grahit, Girona, Spain; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden
Recommended Citation:
Catalán N.,Marcé R.,Kothawala D.N.,et al. Organic carbon decomposition rates controlled by water retention time across inland waters[J]. Nature Geoscience,2016-01-01,9(7)