程艳辉, 赵书华, 莫琼, 郭忠录, 蔡崇法. 等高绿篱--坡地农业复合系统土壤N2O排放特征[J]. 中国生态农业学报(中英文), 2013, 21(6): 700-706. DOI: 10.3724/SP.J.1011.2013.00700
引用本文: 程艳辉, 赵书华, 莫琼, 郭忠录, 蔡崇法. 等高绿篱--坡地农业复合系统土壤N2O排放特征[J]. 中国生态农业学报(中英文), 2013, 21(6): 700-706. DOI: 10.3724/SP.J.1011.2013.00700
CHENG Yan-Hui, ZHAO Shu-Hua, MO Qiong, GUO Zhong-Lu, CAI Chong-Fa. Soil N2O emission in contour hedgerow/crop intercropping system in subtropical China[J]. Chinese Journal of Eco-Agriculture, 2013, 21(6): 700-706. DOI: 10.3724/SP.J.1011.2013.00700
Citation: CHENG Yan-Hui, ZHAO Shu-Hua, MO Qiong, GUO Zhong-Lu, CAI Chong-Fa. Soil N2O emission in contour hedgerow/crop intercropping system in subtropical China[J]. Chinese Journal of Eco-Agriculture, 2013, 21(6): 700-706. DOI: 10.3724/SP.J.1011.2013.00700

等高绿篱--坡地农业复合系统土壤N2O排放特征

Soil N2O emission in contour hedgerow/crop intercropping system in subtropical China

  • 摘要: N2O是一种重要的温室气体, 具有很强的温室效应。当前全球变化条件下, 人类活动和农业生产行为产生的N2O排放增加是当前倍受关注的问题。本研究于2008年11月-2009年10月, 利用静态箱 气相色谱技术对亚热带地区紫穗槐(Amorpha fruticosa L.)绿篱枝叶还田条件下冬小麦 夏玉米轮作田土壤N2O排放通量进行原位监测, 观测紫穗槐枝叶移出(AR)、翻施(AI)、表施(AC)及作物单作(CK)4种处理下整个生长季土壤N2O的排放量, 对等高绿篱 坡地农业复合生态系统土壤N2O排放通量变化及其影响机制进行研究。结果表明, 整个冬小麦 夏玉米轮作期, 4个处理土壤N2O排放通量呈现出相似的季节变化特征, AR、AI、AC、CK处理全生长季的排放总量为127.62 mg·m-2、209.66 mg·m-2、208.73 mg·m-2、77.52 mg·m-2。作物不同生育阶段N2O日均排放通量在冬小麦季表现为: 开花-成熟期>拔节-开花期>出苗-拔节期; 在夏玉米季表现为: 拔节-抽雄期>播种-拔节期>抽雄-成熟期。本试验综合评估了等高绿篱 坡地农业复合生态系统土壤N2O排放通量变化及其影响机制。研究显示, 土壤N2O排放通量在冬小麦季与土壤温度相关性显著, 在夏玉米季与土壤水分相关性显著。在复合生态系统中紫穗槐复合种植及枝叶还田显著促进土壤N2O排放, 翻施处理产生的N2O量大于表施处理。

     

    Abstract: Nitrous oxide (N2O) is one of the important greenhouse gases with a very strong global warming effect. Emissions of N2O resulting from anthropogenic activities and agricultural management practices have gained international significance in the combating climate change. A field experiment was conducted from Nov. 2008 to Oct. 2009 to evaluate N2O emissions in the crop rotation system of winter wheat and summer maize with contour Amorpha fruticosa hedge in subtropical China using static chamber gas chromatograph technique. Four treatments - compound planting of crop and hedgerow without return of hedgerow plant branches and leaves (AR), compound planting of crop and hedgerow with incorporation of hedgerow plant branches and leaves (AI), compound planting of crop and hedgerow with hedgerow plant branches and leaves mulching (AC) and monocropped crop (CK) - were used in the experiment. Results from the field observations suggested that the trends in emitted N2O fluxes under AR, AI, AC and CK were similar. Total N2O emissions from the four treatments during the whole growing season of winter wheat/summer maize rotation system were respectively 127.62 mg·m-2, 209.66 mg·m-2, 208.73 mg·m-2 and 77.52 mg·m-2. The order of N2O emission at different growth of winter wheat was: flowering-ripening stage > elongation-flowering stage > seeding emergence-elongation stage. The corresponding order of N2O emission at different growth stages of maize was: elongation-tasseling stage > seeding-elongation stage > tasseling-ripening stage. Furthermore, seasonal variation in N2O emission was regulated by soil temperature in winter wheat season and by water-filled soil pore space in summer maize season. Contour hedgerow intercropping and returning of hedge plant branches and leaves markedly enhanced soil N2O emission in complex agro-ecosystems. Compared with hedge plant branches and leaves mulching, incorporation of branches and leaves promoted N2O emission.

     

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