Which cropland greenhouse gas mitigation options give the greatest benefits in different world regions?

Climate and soil-specific predictions from integrated empirical models

Jonathan George Hillier, Frank Brentrup, Martin Wattenbach, Christof Walter, Tirma Garcia-Suarez, Llorenc Mila-I-Canals, Pete Smith

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Major sources of greenhouse gas (GHG) emissions from agricultural crop production are nitrous oxide (N2O) emissions resulting from the application of mineral and organic fertilizer, and carbon dioxide (CO2) emissions from soil carbon losses. Consequently, choice of fertilizer type, optimizing fertilizer application rates and timing, reducing microbial denitrification and improving soil carbon management are focus areas for mitigation. We have integrated separate models derived from global data on fertilizer-induced soil N2O emissions, soil nitrification inhibitors, and the effects of tillage and soil inputs of soil C stocks into a single model to determine optimal mitigation options as a function of soil type, climate, and fertilization rates. After Monte Carlo sampling of input variables, we aggregated the outputs according to climate, soil and fertilizer factors to consider the benefits of several possible emissions mitigation strategies, and identified the most beneficial option for each factor class on a per-hectare basis. The optimal mitigation for each soil-climate-region was then mapped to propose geographically specific optimal GHG mitigation strategies for crops with varying N requirements. The use of empirical models reduces the requirements for validation (as they are calibrated on globally or continentally observed phenomena). However, as they are relatively simple in structure, they may not be applicable for accurate site-specific prediction of GHG emissions. The value of this modelling approach is for initial screening and ranking of potential agricultural mitigation options and to explore the potential impact of regional agricultural GHG abatement policies. Given the clear association between management practice and crop productivity, it is essential to incorporate characterization of the yield effect on a given crop before recommending any mitigation practice.

Original languageEnglish
Pages (from-to)1880-1894
Number of pages15
JournalGlobal Change Biology
Volume18
Issue number6
Early online date30 Mar 2012
DOIs
Publication statusPublished - Jun 2012

Keywords

  • agriculture
  • climate
  • fertilizer
  • greenhouse gas
  • mitigation
  • modelling
  • nitrous oxide
  • soil carbon
  • tillage

Cite this

Which cropland greenhouse gas mitigation options give the greatest benefits in different world regions? Climate and soil-specific predictions from integrated empirical models. / Hillier, Jonathan George; Brentrup, Frank; Wattenbach, Martin; Walter, Christof; Garcia-Suarez, Tirma; Mila-I-Canals, Llorenc; Smith, Pete.

In: Global Change Biology, Vol. 18, No. 6, 06.2012, p. 1880-1894.

Research output: Contribution to journalArticle

Hillier, Jonathan George ; Brentrup, Frank ; Wattenbach, Martin ; Walter, Christof ; Garcia-Suarez, Tirma ; Mila-I-Canals, Llorenc ; Smith, Pete. / Which cropland greenhouse gas mitigation options give the greatest benefits in different world regions? Climate and soil-specific predictions from integrated empirical models. In: Global Change Biology. 2012 ; Vol. 18, No. 6. pp. 1880-1894.
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