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The global significance of omitting soil erosion from soil organic carbon cycling schemes

Chappell, Adrian ORCID:, Baldock, Jeffrey and Sanderman, Jonathan 2016. The global significance of omitting soil erosion from soil organic carbon cycling schemes. Nature Climate Change 6 (2) , pp. 187-191. 10.1038/nclimate2829

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Soil organic carbon (SOC) cycling schemes used in land surface models (LSMs) typically account only for the effects of net primary production and heterotrophic respiration1. To demonstrate the significance of omitting soil redistribution in SOC accounting, sequestration and emissions, we modified the SOC cycling scheme RothC (ref. 2) to include soil erosion. Net SOC fluxes with and without soil erosion for Australian long-term trial sites were established and estimates made across Australia and other global regions based on a validated relation with catchment-scale soil erosion. Assuming that soil erosion is omitted from previous estimates of net C flux, we found that SOC erosion is incorrectly attributed to respiration. On this basis, the Australian National Greenhouse Gas inventory overestimated the net C flux from cropland by up to 40% and the potential (100 year) C sink is overestimated by up to 17%. We estimated global terrestrial SOC erosion to be 0.3–1.0 Pg C yr−1 indicating an uncertainty of −18 to −27% globally and +35 to −82% regionally relative to the long-term (2000–2010) terrestrial C flux of several LSMs. Including soil erosion in LSMs should reduce uncertainty in SOC flux estimates3,4 with implications for CO2 emissions, mitigation and adaptation strategies and interpretations of trends and variability in global ecosystems5.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Publisher: Nature Research
ISSN: 1758-678X
Date of Acceptance: 18 August 2015
Last Modified: 24 Oct 2022 07:56

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