Managing uncertainty in soil carbon feedbacks to climate change

Planetary warming may be exacerbated if it accelerates loss of soil carbon to the atmosphere. This carbon-cycle–climate feedback is included in climate projections. Yet, despite ancillary data supporting a positive feedback, there is limited evidence for soil carbon loss under warming. The low confi...

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Bibliographic Details
Published in:Nature climate change Vol. 6; no. 8; pp. 751 - 758
Main Authors: Bradford, Mark A., Wieder, William R., Bonan, Gordon B., Fierer, Noah, Raymond, Peter A., Crowther, Thomas W.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 01.08.2016
Nature Publishing Group
Subjects:
631/158/47
704/106/47
704/106/694
704/158/2445
704/47
Biogeochemistry
Biosphere
Carbon
Climate Change
Climate Change/Climate Change Impacts
Decomposition
Ecology
Emissions
Environment
Environmental Law/Policy/Ecojustice
Feedback
Greenhouse gases
Respiration
review-article
Soil erosion
Soil stabilization
Soils
United States > US
Netherlands
Colorado
ISSN:1758-678X, 1758-6798
Online Access:Get full text
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Summary:Planetary warming may be exacerbated if it accelerates loss of soil carbon to the atmosphere. This carbon-cycle–climate feedback is included in climate projections. Yet, despite ancillary data supporting a positive feedback, there is limited evidence for soil carbon loss under warming. The low confidence engendered in feedback projections is reduced further by the common representation in models of an outdated knowledge of soil carbon turnover. 'Model-knowledge integration' — representing in models an advanced understanding of soil carbon stabilization — is the first step to build confidence. This will inform experiments that further increase confidence by resolving competing mechanisms that most influence projected soil-carbon stocks. Improving feedback projections is an imperative for establishing greenhouse gas emission targets that limit climate change. Climate change may accelerate decomposition of soil carbon leading to a reinforcing cycle of further warming and soil carbon loss. This Review considers the uncertainties and modelling challenges involved in projecting soil responses to warming.
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ISSN:1758-678X
1758-6798
DOI:10.1038/nclimate3071