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Effects of Annual Straw Returning with Different Tillage Patterns on Greenhouse Gas Emissions in Double-rice System

Effects of Annual Straw Returning with Different Tillage Pat...

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2016年全国青年作物栽培与生理学术研讨会

作者： Jun Zhang Samoura Mohamed Lamine Xiaoning Hang Afreh Daniel Haoyu Qian Aixing Deng Weijian Zhang Institute of Crop Sciences Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and EcologyMinistry of Agriculture Chongqing Academy of Agricultural Sciences

【BACKGROUND】Rice straw impacts rice productivity and ***,large amount of researches focused on the effects of tillage managements and straw incorporation on soil fertility and grain ***,the interaction of annual straw returned to the field and tillage patterns received less attention.【MATERIALS AND METHODS】 In this study,field experiments about annual straw returning(total straw returning,as "-S";and no straw returning as control) and tillage managements(annual rotary tillage,as "RT" and annual plowing tillage,as "PT") were carried out(located Jiangxi province Yujiang city since 2008) on the double cropping rice region in south of *** productivity,greenhouse gas emissions(CH,NO),soil carbon sequestration and net greenhouse potential were measured.【RESULTS】The results showed that straw returningincreased the early rice yield by 12.1%,while there was no significant effect on the annual yield,in addition,straw returning made up for the grain yield decline caused by fully long-term plowing *** the rotary tillage,straw returning significantly increased the late rice season methane(CH) emission and global warming potential(GWP) by 33.2%and30.6%,respectively,while showedless affect at the early rice *** the other hand,there was no significant effectof straw returning on CH and GWP in the two rice seasons under plowing ***-tillageaveragely reduced GWP and GHGI value entiretwo yearsdouble ricecroppingby 45.1%and 31.8%significantly when compared with plowing *** terms of medium and long effects,the annual carbon sequestration rate of 0-20 cm soil layer under rotary tillage with straw returning could reach up to 635.2 kg CO-eq haa,and was significantly83.3%higher,alsothe net greenhouse gaspotential was significantly 58%greater than that in PT.【CONCLUSION】The present study suggested that,under the fully annual straw returning,reasonable tillage patterns(such as plowing) could be effective to mitigate g

关键词： Rice Annual straw returning Greenhouse gas emissions C sequestration net global warming potential

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