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Global warming potential of emissions from rice paddies in Northeastern China

  • Xiaoming Xu
  • Jie Tang
  • Zhaoyang Li
  • Chang Liu
  • Weizheng Han
Original Article

Abstract

In this study, paddy fields in Jilin province which are flooded parcel of arable lands used for growing rice (Oryza sativa Linn.) were selected as the object. Long-term exploitation of paddy fields led to variations of soil organic carbon (SOC) and green house gases (GHGs) emissions which might contribute to global warming. In order to calculate the amount of global warming potentials (GWPs) of emissions from ricepaddies and find the correlations among rice yield, SOC storage and GWP, DeNitrification-DeComposition (DNDC) model was used to simulate SOC densities and fluxes of main GHGs emitted from paddy fields. After verification, simulation results were used to calculate SOC storages and 100-year GWPs from 1949 to 2009. Results indicated that SOC densities in depths of 0–10 cm, 10–20 cm and 20–30 cm all kept increasing. Average methane (CH4) and nitrous oxide (N2O) fluxes were 278.55 kg carbon (kgC) ha−1 a−1 and 2.22 kg nitrogen (kgN) ha−1 a−1. The SOC storage (0–30 cm) had increased from 3.96 × 109kgC in 1949 to 47.85 × 109kgC in 2009. In addition, GWP emission was increasing exponentially in the past 61 years, from 0.16 × 106 Mg carbon dioxide equivalents (CO2-equivalents) to 66.36 × 106 Mg CO2-equivalents. Both SOC storage and GWP presented obviously linear relation to rice yields. Overall, the research suggested that long-term rice yields could be used to estimate the SOC storage and GWP variations.

Keywords

DNDC model Global warming potential Paddy fields Rice yield Soil organic carbon 

Notes

Acknowledgements

This paper was supported by National Nature Science Foundation of China (No. 40871088) and Specialized Research Fund for the Doctoral Program of Higher Education in China (No. 20090061110057).

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Xiaoming Xu
    • 1
  • Jie Tang
    • 1
  • Zhaoyang Li
    • 1
  • Chang Liu
    • 1
  • Weizheng Han
    • 1
  1. 1.College of Environment and ResourcesJilin UniversityChangchunChina

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