Evidence against recent climate-induced destabilisation of soil carbon from 14C analysis of riverine dissolved organic matter
Evans, Chris D.; Freeman, Chris; Cork, Lorna G.; Thomas, David N.; Reynolds, Brian; Billett, Michael F.; Garnett, Mark H.; Norris, David. 2007 Evidence against recent climate-induced destabilisation of soil carbon from 14C analysis of riverine dissolved organic matter. Geophysical Research Letters, 34, L07407. 10.1029/2007GL029431Before downloading, please read NORA policies.
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.
|Programmes:||CEH Programmes pre-2009 publications > Biogeochemistry|
|Additional Keywords:||soil carbon, DOC, radiocarbon, Euro-limpacs deliverable no. 157, Task 5.2|
|NORA Subject Terms:||Agriculture and Soil Science
Ecology and Environment
|Date made live:||19 Dec 2007 15:51|
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