Differences in net global warming potential and greenhouse gas intensity between major rice-based cropping systems in China

Double rice (DR) and upland crop-single rice (UR) systems are the major rice-based cropping systems in China, yet differences in net global warming potential (NGWP) and greenhouse gas intensity (GHGI) between the two systems are poorly documented. Accordingly, a 3-year field experiment was conducted...

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Bibliographic Details
Published in:Scientific reports 2015-12, Vol.5 (1), p.17774, Article 17774
Main Authors: Xiong, Zhengqin, Liu, Yinglie, Wu, Zhen, Zhang, Xiaolin, Liu, Pingli, Huang, Taiqing
Format: Article
Language:English
Subjects:
704/106/694
704/158/2456
704/172/169
Cereal crops
China
Climate change
Crop Production
Cropping systems
Emissions
Global Warming
Greenhouse Effect
Greenhouse gases
Growing season
Humanities and Social Sciences
Methane
Methane - analysis
multidisciplinary
Nitrous oxide
Nitrous Oxide - analysis
Organic carbon
Organic soils
Oryza - growth & development
Rice
Science
Straw
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Summary:Double rice (DR) and upland crop-single rice (UR) systems are the major rice-based cropping systems in China, yet differences in net global warming potential (NGWP) and greenhouse gas intensity (GHGI) between the two systems are poorly documented. Accordingly, a 3-year field experiment was conducted to simultaneously measure methane (CH 4 ) and nitrous oxide (N 2 O) emissions and changes in soil organic carbon (SOC) in oil rape-rice-rice and wheat-rice (representing DR and UR, respectively) systems with straw incorporation (0, 3 and 6 t/ha) during the rice-growing seasons. Compared with the UR system, the annual CH 4 , N 2 O, grain yield and NGWP were significantly increased in the DR system, though little effect on SOC sequestration or GHGI was observed without straw incorporation. Straw incorporation increased CH 4 emission and SOC sequestration but had no significant effect on N 2 O emission in both systems. Averaged over the three study years, straw incorporation had no significant effect on NGWP and GHGI in the UR system, whereas these parameters were greatly increased in the DR system, i.e., by 108% (3 t/ha) and 180% (6 t/ha) for NGWP and 103% (3 t/ha) and 168% (6 t/ha) for GHGI.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep17774