期刊
GEOPHYSICAL RESEARCH LETTERS
卷 34, 期 7, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2007GL029431
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资金
- Natural Environment Research Council [ceh010023, NER/J/S/2002/00647] Funding Source: researchfish
The stability of global soil carbon ( C) represents a major uncertainty in forecasting future climate change. In the UK, substantial soil C losses have been reported, while at the same time dissolved organic carbon (DOC) concentrations in upland waters have increased, suggesting that soil C stocks may be destabilising in response to climate change. To investigate the link between soil carbon and DOC at a range of sites, soil organic matter, soilwater and streamwater DOC were analysed for radiocarbon (C-14). DOC exported from C-rich landscapes appears younger than the soil C itself, much of it comprising C assimilated post-1950s. DOC from more intensively managed, C-poor soils is older, in some cases > 100 years. Results appear consistent with soil C destabilisation in farmed landscapes, but not in peatlands. Reported C losses may to a significant extent be explained by mechanisms other than climate change, e. g. recovery from acidification in peatlands, and agricultural intensification in managed systems.
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