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Journal of Integrative Agriculture  2012, Vol. 12 Issue (9): 1537-1544    DOI: 10.1016/S1671-2927(00)8686
SOIL & FERTILIZER · AGRI-ECOLOGY & ENVIRONMENT Advanced Online Publication | Current Issue | Archive | Adv Search |
Effects of Chinese Milk Vetch (Astragalus sinicus L.) Residue Incorporation on CH4 and N2O Emission from a Double-Rice Paddy Soil
 ZHU Bo, YI Li-xia, HU Yue-gao, ZENG Zhao-hai, TANG Hai-ming, YANG Guang-li,  XIAO Xiao-ping
1.College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, P.R.China
2.Hunan Soil and Fertilizer Institute, Changsha 410125, P.R.China
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摘要  Methane (CH4) and nitrous oxide (N2O) emissions from paddy soils have seldom been estimated when leguminous green manure is applied as a nitrogen source. In this paper, gas fluxes were measured by using a pot sampling device combined with a static chamber method to estimate the effects of Chinese milk vetch (Astragalus sinicus L., CMV) on CH4 and N2O emissions and their integrated global warming potentials (GWP) in a double-rice cropping system. Four treatments (no nitrogen fertilizer, NF; urea as chemical fertilizer, CF; CMV incorporation, MV; 50% CMV incorporation and 50% urea, MVCF) were established. CH4 flux peaked on the 15th d after treatment application. Total season CH4 emission was increased by MV and MVCF by 370 and 209%, 152 and 66%, when compared with NF and CF, respectively. Most of the increased CH4 was emitted in the first two months after incorporation of CMV. N2O emission from CF was 17- and 5.6-fold higher than that from MV and MVCF, respectively. Application of CMV restricted N2O emission caused by the application of urea. Improved CMV residue management was needed to minify CH4 emission induced by the input of organic material. Despite the highest GWP being found in MV, we recommend CMV, when applied as an N source in paddy fields, as a potential mitigation tool for greenhouse gas emissions.

Abstract  Methane (CH4) and nitrous oxide (N2O) emissions from paddy soils have seldom been estimated when leguminous green manure is applied as a nitrogen source. In this paper, gas fluxes were measured by using a pot sampling device combined with a static chamber method to estimate the effects of Chinese milk vetch (Astragalus sinicus L., CMV) on CH4 and N2O emissions and their integrated global warming potentials (GWP) in a double-rice cropping system. Four treatments (no nitrogen fertilizer, NF; urea as chemical fertilizer, CF; CMV incorporation, MV; 50% CMV incorporation and 50% urea, MVCF) were established. CH4 flux peaked on the 15th d after treatment application. Total season CH4 emission was increased by MV and MVCF by 370 and 209%, 152 and 66%, when compared with NF and CF, respectively. Most of the increased CH4 was emitted in the first two months after incorporation of CMV. N2O emission from CF was 17- and 5.6-fold higher than that from MV and MVCF, respectively. Application of CMV restricted N2O emission caused by the application of urea. Improved CMV residue management was needed to minify CH4 emission induced by the input of organic material. Despite the highest GWP being found in MV, we recommend CMV, when applied as an N source in paddy fields, as a potential mitigation tool for greenhouse gas emissions.
Keywords:  Chinese milk vetch      double-rice      global warming potential      methane      nitrous oxide  
Received: 14 November 2011   Accepted:
Fund: 

This work was supported by the National Natural Science Foundation of China (31171509 and 30671222), the Special Fund for Agro-Scientific Research in the Public Interest, China (201103001), and the Key Technologies R&D Program During the 12th Five-Year Plan period (2012BAD146B03-2).

Corresponding Authors:  Correspondence ZENG Zhao-hai, Tel: +86-10-62734884, Mobile: 13911686202, E-mail:zengzhaohai@cau.edu.cn     E-mail:  zengzhaohai@cau.edu.cn
About author:  ZHU Bo, Tel: +86-10-62733847, E-mail: 1984zhubo@163.com

Cite this article: 

ZHU Bo, YI Li-xia, HU Yue-gao, ZENG Zhao-hai, TANG Hai-ming, YANG Guang-li, XIAO Xiao-ping. 2012. Effects of Chinese Milk Vetch (Astragalus sinicus L.) Residue Incorporation on CH4 and N2O Emission from a Double-Rice Paddy Soil. Journal of Integrative Agriculture, 12(9): 1537-1544.

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