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Modeling impacts of alternative practices on net global warming potential and greenhouse gas intensity from rice-wheat annual rotation in China.

Abstract

BACKGROUND

Evaluating the net exchange of greenhouse gas (GHG) emissions in conjunction with soil carbon sequestration may give a comprehensive insight on the role of agricultural production in global warming.

MATERIALS AND METHODS

Measured data of methane (CH(4)) and nitrous oxide (N(2)O) were utilized to test the applicability of the Denitrification and Decomposition (DNDC) model to a winter wheat - single rice rotation system in southern China. Six alternative scenarios were simulated against the baseline scenario to evaluate their long-term (45-year) impacts on net global warming potential (GWP) and greenhouse gas intensity (GHGI).

PRINCIPAL RESULTS

The simulated cumulative CH(4) emissions fell within the statistical deviation ranges of the field data, with the exception of N(2)O emissions during rice-growing season and both gases from the control treatment. Sensitivity tests showed that both CH(4) and N(2)O emissions were significantly affected by changes in both environmental factors and management practices. Compared with the baseline scenario, the long-term simulation had the following results: (1) high straw return and manure amendment scenarios greatly increased CH(4) emissions, while other scenarios had similar CH(4) emissions, (2) high inorganic N fertilizer increased N(2)O emissions while manure amendment and reduced inorganic N fertilizer scenarios decreased N(2)O emissions, (3) the mean annual soil organic carbon sequestration rates (SOCSR) under manure amendment, high straw return, and no-tillage scenarios averaged 0.20 t C ha(-1) yr(-1), being greater than other scenarios, and (4) the reduced inorganic N fertilizer scenario produced the least N loss from the system, while all the scenarios produced comparable grain yields.

CONCLUSIONS

In terms of net GWP and GHGI for the comprehensive assessment of climate change and crop production, reduced inorganic N fertilizer scenario followed by no-tillage scenario would be advocated for this specified cropping system.

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  • Authors+Show Affiliations

    ,

    Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, China.

    , , , , , ,

    Source

    PloS one 7:9 2012 pg e45668

    MeSH

    China
    Crops, Agricultural
    Gases
    Global Warming
    Greenhouse Effect
    Models, Theoretical
    Oryza sativa

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't
    Validation Studies

    Language

    eng

    PubMed ID

    23029173

    Citation

    TY - JOUR T1 - Modeling impacts of alternative practices on net global warming potential and greenhouse gas intensity from rice-wheat annual rotation in China. AU - Wang,Jinyang, AU - Zhang,Xiaolin, AU - Liu,Yinglie, AU - Pan,Xiaojian, AU - Liu,Pingli, AU - Chen,Zhaozhi, AU - Huang,Taiqing, AU - Xiong,Zhengqin, Y1 - 2012/09/21/ PY - 2012/6/25/received PY - 2012/8/21/accepted PY - 2012/9/21/epublish PY - 2012/10/3/entrez PY - 2012/10/3/pubmed PY - 2013/3/30/medline SP - e45668 EP - e45668 JF - PloS one JO - PLoS ONE VL - 7 IS - 9 N2 - BACKGROUND: Evaluating the net exchange of greenhouse gas (GHG) emissions in conjunction with soil carbon sequestration may give a comprehensive insight on the role of agricultural production in global warming. MATERIALS AND METHODS: Measured data of methane (CH(4)) and nitrous oxide (N(2)O) were utilized to test the applicability of the Denitrification and Decomposition (DNDC) model to a winter wheat - single rice rotation system in southern China. Six alternative scenarios were simulated against the baseline scenario to evaluate their long-term (45-year) impacts on net global warming potential (GWP) and greenhouse gas intensity (GHGI). PRINCIPAL RESULTS: The simulated cumulative CH(4) emissions fell within the statistical deviation ranges of the field data, with the exception of N(2)O emissions during rice-growing season and both gases from the control treatment. Sensitivity tests showed that both CH(4) and N(2)O emissions were significantly affected by changes in both environmental factors and management practices. Compared with the baseline scenario, the long-term simulation had the following results: (1) high straw return and manure amendment scenarios greatly increased CH(4) emissions, while other scenarios had similar CH(4) emissions, (2) high inorganic N fertilizer increased N(2)O emissions while manure amendment and reduced inorganic N fertilizer scenarios decreased N(2)O emissions, (3) the mean annual soil organic carbon sequestration rates (SOCSR) under manure amendment, high straw return, and no-tillage scenarios averaged 0.20 t C ha(-1) yr(-1), being greater than other scenarios, and (4) the reduced inorganic N fertilizer scenario produced the least N loss from the system, while all the scenarios produced comparable grain yields. CONCLUSIONS: In terms of net GWP and GHGI for the comprehensive assessment of climate change and crop production, reduced inorganic N fertilizer scenario followed by no-tillage scenario would be advocated for this specified cropping system. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/23029173/Modeling_impacts_of_alternative_practices_on_net_global_warming_potential_and_greenhouse_gas_intensity_from_rice_wheat_annual_rotation_in_China_ L2 - http://dx.plos.org/10.1371/journal.pone.0045668 ER -