Evidence against recent climate-induced destabilisation of soil carbon from 14C analysis of riverine dissolved organic matter

Details Evidence against recent climate-induced destabilisation of soil carbon from 14C analysis of riverine dissolved organic matter Evidence against recent climate-induced destabilisation of soil carbon from 14C analysis of riverine dissolved organic matter

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3407407e&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 7, CiteID L07407

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6

Biogeosciences: Biogeochemical Cycles, Processes, And Modeling (0412, 0793, 1615, 4805, 4912), Biogeosciences: Climate Dynamics (1620), Biogeosciences: Water Quality, Global Change: Impacts Of Global Change (1225), Geochemistry: Stable Isotope Geochemistry (0454, 4870)

Scientific paper

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 (14C). 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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