双季稻区冬季覆盖作物残茬还田对稻田甲烷和氧化亚氮排放的影响

doi:10.3724/SP.J.1006.2011.01666

Abstract

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

TANG Hai-Meng, XIAO Xiao-Beng, SHANG Wen-Guang, YANG Guang-Li. Effects of Straw Recycling of Winter Covering Crop on Methane and Nitrous Oxide Emissions in Paddy Field[J].Acta Agron Sin, 2011, 37(09): 1666-1675.

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

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