内蒙古旱作农田土壤有机碳对免耕留茬的响应

传统耕翻使农田土壤水分散失并加剧其退化趋势;免耕留茬可以在一定程度上改善土壤性质.本文通过研究不同留茬高度对土壤有机碳的影响,旨在选择适宜留茬高度和配套耕作措施。在半干旱气候条件下，研究了燕麦高茬（GC）、低茬（DC）和传统（CT）３种耕作方式对燕麦田土壤含水量、土壤温度、土壤呼吸速率和土壤有机碳含量的影响。随着留茬高度的增加土壤温度降低，GC和DC较CT土壤温度分别降低了8%、7%。GC和DC能够提高土壤含水量，GC最大，较CT提高了24.6%。GC和DC均能明显提高燕麦不同生育时期土壤呼吸速率，且GC土壤呼吸速率最高，达32.71%。GC土壤有机碳显著于CT。燕麦产量表现为：GC>DC>CT，且GC和DC比CT显著提高了40%和25%。燕麦留茬可以提高土壤呼吸速率，增加土壤有机碳含量，具有显著的增产效应。

Soil Organic Carbon of Rain Fed Cropland of Inner Mongolia Response to Stubble Tillage

Traditional plowing increased the farmland soil moisture loss and increased the degradation trend; No-till stubble can improve the soil properties to a certain extent. In this paper, through studying the influence of different stubble height on soil organic carbon, to choose the appropriate stubble height and form a complete set of cultivation measures. In semi-arid climate conditions, studied the oats high stubble (GC), low (DC) and traditional (CT) three kinds of farming on oat field soil moisture, soil temperature, soil respiration rate and the influence of soil organic carbon content. With the stubble height increased, the soil temperature is decreasing; GC, and DC than CT soil temperature decreased by 8%, 7%.GC and DC can improve soil moisture content, the GC is the largest, which compare to CT increased by 24.6%. GC and DC all can notable increase the soil respiration rate at different development stages, GC soil respiration rate is highest, 32.71%. The GC soil organic carbon is notable to CT. Oat production performance for: GC > DC > CT, what is more, GC and DC are significantly higher than CT by 40% and 25%. Oats no-till stubble can improve the soil respiration rate, increase soil organic carbon content, which has significant effect on increasing the production.