Dry direct-seeding of rice for mitigating greenhouse gas emission: field experimentation and simulation
Dry direct-seeding of rice for mitigating greenhouse gas emission: field experimentation and simulation
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DOI：
10.1007/s10333-012-0352-0
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发表时间：
2013-01-01
影响因子：
2.2
通讯作者：
Jain, N.
中科院分区：
文献类型：
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作者：
Pathak, H.;Sankhyan, S.;Jain, N.
传统的水坑移栽水稻(TPR)是温室气体(GHG)的主要来源，尤其是甲烷，导致全球变暖。除了节水省力外，直播水稻(DSR)是减少甲烷排放的一种可行的选择。在印度旁遮普邦贾兰达尔地区的三个村庄进行了为期两年的田间试验，以量化DSR作物与TPR作物的温室气体减排、节水和节工潜力。利用InfoRCT模拟模型计算了印度旁遮普省不同地区除CH4和N2O外的CO2排放量。旁遮普不同地区移栽水稻的全球变暖潜势(GWP)在2.0到4.6吨二氧化碳当量之间。HA(-1)，在DSR中，它的范围在1.3到2.9吨二氧化碳当量之间。HA(-1)。外推分析表明，如果将该州TPR下的整个区域转换为DSR，GWP将减少33%，如果将50%的区域转换为DSR，GWP将减少当前排放量的16.6%。与没有任何产量损失的移栽水稻相比，DSR作物节省了3-4次灌溉。与TPR相比，DSR中的人力使用量也减少到45%，拖拉机使用量减少到58%。
Conventional puddled transplanted rice (TPR) is a major source of greenhouse gas (GHG), particularly methane, causing global warming. Direct-seeded rice (DSR) is a feasible alternative to mitigate methane emission, besides saving water and labor. A 2-year field experiment was carried out to quantify GHG mitigation and water- and labor-saving potentials of the DSR crop compared to TPR in three villages in Jalandhar district of Punjab, India. The InfoRCT simulation model was used to calculate the emission of CO2 besides CH4 and N2O in different districts of Punjab, India. Total global warming potential (GWP) in transplanted rice in various districts of Punjab ranged from 2.0 to 4.6 t CO2 eq. ha(-1) and in the DSR it ranged from 1.3 to 2.9 t CO2 eq. ha(-1). Extrapolation analysis showed that if the entire area under TPR in the state is converted to DSR, the GWP will be reduced by 33 %, and if 50 % area is converted to DSR the GWP will be reduced by 16.6 % of the current emission. The DSR crop saved 3-4 irrigations compared to the transplanted rice without any yield penalty. Human labor use also reduced to 45 % and tractor use to 58 % in the DSR compared to TPR.