Hydrology and Land Surface Studies
Evidence against recent climate-induced destabilisation of soil carbon from 14C analysis of riverine dissolved organic matter
Article first published online: 13 APR 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 7, April 2007
How to Cite
2007), Evidence against recent climate-induced destabilisation of soil carbon from 14C analysis of riverine dissolved organic matter, Geophys. Res. Lett., 34, L07407, doi:10.1029/2007GL029431., , , , , , , and (
- Issue published online: 13 APR 2007
- Article first published online: 13 APR 2007
- Manuscript Accepted: 16 MAR 2007
- Manuscript Revised: 12 MAR 2007
- Manuscript Received: 24 JAN 2007
- soil carbon;
 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.