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Earth System Dynamics An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/esdd-5-1-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
02 Jan 2014
Review status
This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.
Historical and future carbon emissions from croplands
S. J. Smith Joint Global Change Research Institute, Pacific Northwest National Laboratory, 5825 University Research Court, Suite 3500, College Park, MD 20740, USA
Abstract. We examine past and future carbon emissions from global croplands, considering land-use change, changes in crop productivity, tillage practices, and residue removal. We find that emissions over the historical period are sensitive to the assumed productivity of arable land that is not planted in a given year and the assumed fraction of soil carbon that is released during land conversion. The role of this "other" arable land, both at present and over the historical period, is not well understood and should be examined further. The carbon balance of croplands over 21st century depends on changes in management practices, particularly the adoption of conservation tillage and the potential removal of residue for use as energy feedstocks. We find that croplands will not become large carbon sinks in the future, however, unless most crop residue is left on fields. Given the relatively low carbon "penalty" incurred by removal, residue use for energy feedstocks may be the preferred option.

Citation: Smith, S. J.: Historical and future carbon emissions from croplands, Earth Syst. Dynam. Discuss., https://doi.org/10.5194/esdd-5-1-2014, in review, 2014.
S. J. Smith
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC C40: 'Reviewer comments', Anonymous Referee #1, 01 Apr 2014 Printer-friendly Version 
 
AC C48: 'Response to Anonymous Referee #1', Steven Smith, 02 Apr 2014 Printer-friendly Version 
 
RC C403: 'Review', Anonymous Referee #2, 27 Aug 2014 Printer-friendly Version 
 
EC C409: 'Editor's Comment', Christian Reick, 03 Sep 2014 Printer-friendly Version 
S. J. Smith

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