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Human-induced erosion has offset one-third of carbon emissions from land cover change

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Wang, Zhengang [UCL] Hoffmann, Thomas Six, Johan Kaplan, Jed O. Govers, Gerard Van Oost, Kristof [UCL]

Anthropogenic land cover change (ALCC) is an important carbon (C) loss mechanism1–3, but current methods do not consider the role of accelerated soil organic C erosion and its burial in sediments in their assessmentsof net soil–atmosphere C exchange. Using a comprehensive global database and parsimonious modelling, we evaluate the impact of anthropogenic soil erosion on C fluxes between the Earth’s surface and atmosphere fromthe onset of agriculture to the present day.We find that agricultural erosion represents a very large and transient perturbation to the C cycle and has induced a cumulative net uptake of 78 22 Pg C in terrestrial ecosystems during the period 6000 BC to AD 2015. This erosion-induced soil organic C sink is estimated to have oset 37 10% of previously recognized C emissions resulting from ALCC.We estimate that rates of C burial have increased by a factor of 4.6 since AD 1850. Thus, current assessments may significantly overestimate both past and future anthropogenic emissions from the land. Given that ALCC is the most uncertain component of the global C budget and that there is a strong connection between ALCC and erosion, an explicit representation of erosion and burial processes is essential to fully understand the impact of human activities on the net soil–atmosphere C exchange.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2017
Language Anglais
Journal information "Nature Climate Change" - Vol. 7, no.5, p. 345-349 (2017)
Peer reviewed yes
Publisher Nature Publishing Group (London)
issn 1758-678X
e-issn 1758-6798
Publication status Publié
Affiliation UCL - SST/ELI/ELIC - Earth & Climate
Links
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Bibliographic reference Wang, Zhengang ; Hoffmann, Thomas ; Six, Johan ; Kaplan, Jed O. ; Govers, Gerard ; et. al. Human-induced erosion has offset one-third of carbon emissions from land cover change. In: Nature Climate Change, Vol. 7, no.5, p. 345-349 (2017)
Permanent URL http://hdl.handle.net/2078.1/185650