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当前位置: 首页 > 文章 > 秸秆还田模式对稻麦两熟农田麦季CH_4和N_2O排放特征的影响 江苏农业学报 2017 (2) 333-339
Position: Home > Articles > Influence of straw returning patterns on methane and nitrous oxide emission during wheat-growing season in a rice-wheat double cropping system Jiangsu Journal of Agricultural Sciences 2017 (2) 333-339

秸秆还田模式对稻麦两熟农田麦季CH_4和N_2O排放特征的影响

作  者：
靳红梅;沈明星;王海候;陆长婴;常志州;郭瑞华
单  位：
江苏省农业科学院循环农业研究中心/江苏省农业废弃物资源化工程技术研究中心;江苏太湖地区农业科学研究所;农业部长江中下游平原农业环境重点实验室
关键词：
秸秆还田模式;麦季;CH4;N2O;排放特征
摘  要：
为了探讨不同秸秆还田模式下稻麦两熟农田麦季CH_4和N_2O的排放规律,以江苏省南部地区稻麦两熟农田为研究对象,进行了8年不同秸秆还田模式[即仅麦季稻秸秆还田处理(R)、仅稻季麦秸秆还田(W)和稻麦季秸秆均还田(RW)]的田间定位试验,采用静态箱-气相色谱法分析各处理麦季田间CH_4和N_2O的排放特征。结果表明,与秸秆不还田对照(CK)相比,秸秆还田可增加麦季CH_4和N_2O的排放通量。各处理间CH_4的累积排放量大小为R处理>RW处理>W处理>CK对照,麦季N_2O的累积排放量大小为W处理>R处理>RW处理>CK对照。各秸秆还田模式(R、W、RW)下,麦季CH_4和N_2O的全球增温潜势(GWP)分别为1 225.5 kg/hm~2,CO_2-eq、1 250.9kg/hm~2,CO_2-eq和1 214.5 kg/hm~2,CO_2-eq,均显著(P<0.05)高于秸秆不还田的1 068.5 kg/hm~2,CO_2-eq。各处理间的单位产量GWP表现为RW处理>W处理>R处理>CK对照,稻麦秸秆均全量还田对气候变化的影响最大。N_2O对总增温潜势的贡献率大于95%,是麦季减排的主要对象。从对气候变化影响的角度考虑,建议秸秆单季还田时采用稻秸秆全量还田。
译  名：
Influence of straw returning patterns on methane and nitrous oxide emission during wheat-growing season in a rice-wheat double cropping system
作  者：
JIN Hong-mei;SHEN Ming-xing;WANG Hai-hou;LU Chang-ying;CHANG Zhi-zhou;GUO Rui-hua;Circular Agriculture Research Center,Jiangsu Academy of Agricultural Sciences/Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center;Key Laboratory of Agro-Environment in Downstream of Yangtze Plain,Ministry of Agriculture;Taihu Research Institute of Agricultural Sciences;
关键词：
straw returning pattern;;wheat-growing season;;CH4;;N2O;;emission characteristics
摘  要：
In order to investigate methane(CH_4) and nitrous oxide(N_2O) emission fluxes under different straw returning patterns,an 8-year field trial in Suzhou,typical rice-wheat double cropping region in southern area of Jiangsu province,was conducted using static chamber-gas chromatograph technique in situ.Straw returning patterns were rice straw returning(R),wheat straw returning(W),both rice straw and wheat straw returning(RW) and no straw returning treatment(CK).The results showed that total CH_4 and N_2O emissions in straw returning treatments were significantly(P<0.05) higher than those in CK treatment,but the changes between the three straw returning patterns were not distinct.Total CH_4 emissions under different treatments followed the order of R>RW>W>CK,while W>R>RW>CK for the total N_2O emission during the whole wheat-growing season.Global warming potentials(GWPs) for treatments of R,W and RW were 1 225.5 kg/hm~2,CO_2-eq,1 250.9kg/hm~2,CO_2-eq and 1 214.5 kg/hm~2,CO_2-eq,respectively,which were significantly(P<0.05) higher than that of CK treatment [1 068.5 kg/hm~2,CO_2-eq].The yield-scaled GWPs between treatments followed the order of RW>W>R>CK,showing that both rice straw and wheat straw returning pattern had the most significant impact on climate change during wheat-growing season.The contribution rates of N_2O to GWPs were more than 95% for all straw returning treatments,indicating that N_2O was the main objection for greenhouse gas reductions during wheat-growing season.Given that R treatment had the least GWP,rice straw returning pattern should be recommended for one-season straw returning application.

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