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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (09): 1666-1675.doi: 10.3724/SP.J.1006.2011.01666

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Straw Recycling of Winter Covering Crop on Methane and Nitrous Oxide Emissions in Paddy Field

TANG Hai-Ming,XIAO Xiao-Ping*,TANG Wen-Guang,YANG Guang-Li   

  1. Soil and Fertilizer Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China?
  • Received:2011-01-28 Revised:2011-04-27 Online:2011-09-12 Published:2011-06-28
  • Contact: 肖小平, E-mail: hntfsxxping@163.com, Tel: 0731-84691345

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Abstract: To learn the characteristics of CH4 and N2O emissions from paddy fields with different double rice cropping patterns will significantly benefit the exploitation of winter fallow paddy with covering crops and the assessment of rice cropping patterns. Therefore, the static chamber-GC technique with manual method was used to determine the effects of double rice cropping systems with different winter covering crops on the emissions of CH4 and N2O. These systems included ryegrass with no-tillage and double rice cropping (T1), Chinese milk vetch with no-tillage and double rice cropping (T2), rape seed with tillage and double rice cropping (T3), potato with straw mulching and tillage and double rice cropping (T4) and fallow and double rice cropping (CK). The results showed that straw recycling of winter crops significantly increased the emissions of CH4 both during the early and later rice growing seasons than the CK. The T4 and T1 treatments had the largest CH4 emissions during the early rice growing season with 20.713 and 16.068 g m-2, respectively, while the T4 and T3 treatments had the largest CH4 emission during the later rice growing season with 60.421 and 48.666 g m-2, respectively. The four treatments with winter covering crops also had larger N2O emissions both during the early and later rice growing seasons than the CK. N2O emissions during the early rice growing season under T1, T2, T3, and T4 treatments were increased by 265.00%, 320.00%, 275.00%, and 65.00%, and during the later rice growing season by 157.89%, 113.16%, 134.21%, and 42.11%, respectively, compared with the CK. Meanwhile, the global warming potentials (GWPs) from paddy fields with different cropping patterns were T4>T3>T1>T2>CK. As a result, straw recycling of winter covering crops will significantly increase the emissions of CH4 and N2O from paddy field under double rice cropping systems.

Key words: Winter cover crop, Paddy field, Double rice cropping, CH4, N2O

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