【摘 要】
：
Corn (Zea mays L.) and wheat (Triticum.aestivum L.) are the most important food crops,accounting for 36% and 26% of the total grain production in the world, respectively (FAO, 2013).China is one of th
【机 构】
：
Institute of Crop Science, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiolog
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Corn (Zea mays L.) and wheat (Triticum.aestivum L.) are the most important food crops,accounting for 36% and 26% of the total grain production in the world, respectively (FAO, 2013).China is one of the largest countries of corn and wheat production and carbon emission, and corn-wheat cropping system is a dominant cropping system particularly in North China Plain.In order to further enhance crop yields and NUE, great efforts have been made on agronomic innovations such as soil tillage in this region.Although some field observations have been implemented about tillage impacts on crop yields and GHGs emissions, the integrative effects of tillage were not clear on crop yields, NUE and GHGs emissions.Thus,a two-year field experiment was carried out in a typical corn-wheat cropping system with four tillage regimes during wheat season, including no-tillage (NT), rotary tillage (RT), sub-soiling tillage (ST) and sub-soiling with rotary tillage (SRT).No-tillage was conducted for all treatments during corn season.Over the two years, the highest yields of corn, wheat and annual were found in the SRT plot, while the lowest annual yield was found in the NT plot averagely.Two-year average annual yield in the SRT was 21789.16kg hal, which was 4.53, 6.12 and 7.33% higher than those in the ST, RT and NT plots, respectively.SRT also stimulated plant N uptake with a higher N harvest index and greater NFP than those under the other tillage practices (P<0.05).Although SRT stimulated N2O emission in wheat season, it significantly reduced the emission in corn season compared to the NT (P<0.05).Thus, no significant differences in total GHGS emissions, area-scaled and yield-scaled were found among the tillage practices.Our results indicate that sub-soiling with rotary tillage might benefit crop production for high yield and N use efficiency with less GHGS emissions for wheat-corn cropping system in North China Plain.
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