生态环境学报Issue(6)：1076-1083,8.
免耕和秸秆覆盖对农田土壤温室气体排放的影响
Effects of no-till and straw mulch on greenhouse gas emission from farmland:A review
摘要
Abstract
Agriculture soil is an important source of greenhouse gas emissions (GHGs), and agricultural management strategies would have a significant influence on GHGs. As two important conservation agricultural strategies, no-till and straw mulch are getting an increasingly wide use in agricultural activities. However, the effect of no-till and straw mulch on GHGs is not clear, and the results from the previous studies are inconsistent. In this study, three important GHGs (CO2, CH4 and N2O) under no-till and straw mulch management were analyzed through analyzing the results from previous literatures to investigate the effect of no-till and straw mulch on GHGs compared with conventional tillage. The results indicated that compared with conventional tillage, no-till reduced soil disturbance, increased the stability of soil aggregates, favored for formation of stable carbon, and reduced CO2 emissions. No-till was benefit for CH4 oxidation, increased the activity of methane-oxidizing bacteria, and reduced CH4 emission. The effect of no-till treatment on N2O emission was highly correlated with climate conditions and soil properties. In dry climate condition, no-till increased N2O emission in poorly-aerated soil, but did not obviously impact N2O emission in good-aerated soil. In wet climate condition, the impacts of no-till on N2Oemission were different under different soil properties. Straw mulch generally increased soil CO2 emission, and it increased with the increase of straw mulch amount. The impact of straw mulch on CH4 emission was highly uncertain, but closely related with the mulching methods and the straw properties. Most researches indicated that straw mulch increased N2O emission, while there were also some research results of no effect or reducing N2O emission. The mechanism of the impact of straw mulch on N2O emission is complex and needs a further research. In the end, research prospect in this field was pointed out. As the promotion of conservation agriculture, many studies were concentrated on crop yield, soil water use efficiency, and soil properties, etc., while the effect of conservation agriculture on GHGs was relative less researched, especially for the combined effect of conservation agriculture on the three major GHGs. Hence, research in the future should focus on the combined effect of no-till and straw mulch on GHGs and forecasting the global warming potential of GHGs, which could provide basic data and theory supports for finding appropriate tillage treatments and straw mulch strategies. Some new technologies, such as isotope tracer technique, can be used to determine the direct and indirect contribution of straw mulch to GHGs. The appropriate tillage and straw mulch treatments that can reduce the GHGs and maintain a reasonable crop yield should be explored in different soil types and weather conditions in different research regions.关键词
免耕/秸秆覆盖/CO2/CH4/N2OKey words
no-till/straw mulch/CO2/CH4/N2O分类
资源环境引用本文复制引用
李英臣,侯翠翠,李勇,过治军..免耕和秸秆覆盖对农田土壤温室气体排放的影响[J].生态环境学报,2014,(6):1076-1083,8.基金项目
河南师范大学博士科研启动课题（qd12129；qd12126）；国际原子能机构合作项目 （）
