| 摘要: |
| 【目的】研究免耕条件下不同轮作方式对土壤CO2排放的影响，以期为农田固碳减排提供参考。【方法】采用大田定位试验的方法，以冬小麦(Triticum aestivum L.) 夏闲、冬小麦-夏玉米(Zea mays L.)、冬小麦-夏大豆(Glycine max(Linn.) Merr.)和冬油菜(Brassica campestris L.)夏玉米4种轮作方式为研究对象，在免耕条件下，分析2012年3-6月冬小麦和冬油菜生长季土壤CO2排放规律，以及其与土壤温度和湿度之间的关系。【结果】免耕条件下4种轮作方式土壤CO2排放通量具有明显的变化规律，整体呈先上升再下降的趋势；平均CO2排放通量表现为冬小麦-夏玉米（13.91 μmol/(m2·s)）>冬小麦-夏大豆（9.09 μmol/(m2·s)）>冬小麦-夏闲（6.43 μmol/(m2·s)）>冬油菜-夏玉米（4.56 μmol/(m2·s)），且不同处理间平均土壤CO2排放通量差异达极显著水平（P<0.01）；冬小麦-夏闲处理土壤温度最低，土壤湿度最大，平均土壤温度和湿度分别为14.49 ℃和13.28%，且与土壤CO2排放通量的相关性最小，说明土壤温湿度变化对冬小麦 夏闲处理土壤呼吸的影响较小。【结论】4种轮作方式中，冬油菜-夏玉米轮作最有利于减少农田温室气体排放，缓解全球气候变化。 |
| 关键词: 轮作方式 土壤CO2排放 土壤温度 土壤湿度 相关关系 |
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| 基金项目:“十二五”国家科技支撑计划项目（2011BAD15B03）；公益性行业（农业）科研专项“西北地区水土资源高效利用农作制”（201103001） |
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| Effects of different rotation modes on soil CO2 emission fluxes from no-till farmland |
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LI Chang-zhen,ZHANG Ting-ting,FENG Yong-zhong,et al
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| Abstract: |
| 【Objective】The paper studied the effects of different rotation modes on soil CO2 emission,to provide a reference for farmland carbon sequestration and emission reduction.【Method】Long term field experiments were conducted to research the dynamic variation of CO2 emission fluxes under 4 rotation modes (winter wheat (Triticum aestivum L.)summer fallow,winter wheat-summer maize (Zea mays L.),winter wheat-summer soybean (Glycine max (Linn.) Merr.),and winter rape (Brassica campestris L.)summer maize) during winter wheat and winter rape growth period from March to June in 2012.The relationship between soil CO2 emission with soil temperature and soil moisture was analyzed as well.【Result】CO2 emission fluxes had significant fluctuation under different rotation modes.The CO2 emission fluxes of four modes were in a decreasing order of winter wheat-summer maize（13.91 μmol/(m2·s)）>winter wheat-summer soybean（9.09 μmol/(m2·s)）>winter wheat summer fallow（6.43 μmol/(m2·s)）>winter rape-summer maize（4.56 μmol/(m2·s)）with extremely significant difference (P<0.01) within different modes.Winter wheat-summer fallow mode had the lowest soil temperature of 14.49 ℃,the highest soil moisture of 13.28%,and the lowest correlation coefficients with CO2 emission flux.It is indicated that soil temperature and moisture had less effect on CO2 emission flux in winter wheat-summer fallow mode.【Conclusion】Winter rape-summer maize model was the best treatment to reduce agricultural greenhouse gas emissions and mitigate global climate change among the 4 tested rotation modes. |
| Key words: rotation modes soil CO2 emission flux soil temperature soil moisture correlation coefficient |
