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首页> 美国卫生研究院文献>PLoS Clinical Trials >Impacts of crop rotational diversity and grazing under integrated crop-livestock system on soil surface greenhouse gas fluxes
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Impacts of crop rotational diversity and grazing under integrated crop-livestock system on soil surface greenhouse gas fluxes

机译：作物－畜牧综合系统下作物轮作多样性和放牧对土壤表层温室气体通量的影响

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Integrated crop-livestock (ICL) system is beneficial in enhancing soil organic carbon and nutrient cycling. However, the benefits of the ICL system on mitigation of GHG emissions are poorly understood. Thus, the present study was initiated in 2011 to assess the effect of crop rotation diversity and grazing managed under the ICL system on GHG emissions. The cropping system investigated here included spring wheat grown continuously for five years and a 5-yr crop rotation (spring wheat-cover crops-corn-pea/barley-sunflower). Each phase was present each year. Yearling steers grazed only the pea/barley, corn and cover crops plots in 2016 and 2017. Exclusion areas avoided the grazing in these crops to compare the GHG fluxes under grazed vs. non-grazed areas. The GHG fluxes were measured weekly from all crop phases during the growing season for both years using a static chamber. Cumulative CO2 and CH4 fluxes were similar from all crop phases over the study period. However, continuous spring wheat recorded higher cumulative N2O fluxes (671 g N ha-1) than that under spring wheat in rotation (571 g N ha-1). Grazing decreased cumulative CO2 fluxes (359 kg C ha-1) compared to ungrazed (409 kg C ha-1), however, no effect from grazing on cumulative CH4 and N2O fluxes over the study period were found. The present study shows that grazing and crop rotational diversity affected carbon and nitrogen inputs, which in turn affected soil CO2 and N2O fluxes. Long-term monitoring is needed to evaluate the response of soil GHG emissions to grazing and crop rotation interactions under the ICL system.
机译：作物－畜牧综合系统（ICL）有利于增强土壤有机碳和养分循环。但是，人们对ICL系统对减少温室气体排放的好处知之甚少。因此，本研究于2011年启动，以评估ICL系统管理的轮作多样性和放牧对温室气体排放的影响。这里调查的种植系统包括连续种植五年的春小麦和五年轮作（春小麦-盖作作物-玉米-豌豆/大麦-向日葵）。每个阶段每年都有。一岁ste牛仅在2016年和2017年放牧豌豆/大麦，玉米和覆盖作物田。放牧区避免放牧这些作物，以比较放牧区和非放牧区的温室气体通量。在这两个年份的生长季节中，使用静态室每周测量所有作物阶段的GHG通量。在研究期间，所有作物阶段的累积CO2和CH4通量相似。但是，连续春小麦的累积N2O通量（671 g N ha -1 ）要高于轮作春小麦（571 g N ha -1 ）。放牧相比未放牧（409 kg C ha -1）降低了累积的CO2通量（359 kg C ha -1 ），但是，放牧对累积的CH4和N2O没有影响在研究期间发现通量。本研究表明，放牧和农作物轮作多样性影响了碳和氮的输入，进而影响了土壤的CO2和N2O通量。在ICL系统下，需要进行长期监测以评估土壤温室气体排放对放牧和作物轮作相互作用的响应。

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