玉米秸秆还田是“十一五”期间提出的提高土壤有机质含量、改善土壤结构、培肥地力、提高作物产量、建立高产稳产农业生产体系的重要举措之一。由于华北地区近年冬季降水量较少,干旱严重,秸秆还田后耕层土壤疏松,通气孔隙增加,土壤热容量降低,易受冷风入侵,土壤降温幅度大,进行玉米秸秆还田的冬小麦发生大面积的冻害,直接影响 Corn stalks return is one of the important measures put forward during the “Eleventh Five-Year” period to improve soil organic matter content, improve soil structure, fertilize fertility, increase crop yield and establish a high and stable agricultural production system. Due to less winter precipitation and severe drought in North China in recent years, the soil of loose plow layer and aeration pore increased, the soil heat capacity decreased, the cold wind invaded and the soil temperature decreased greatly. The area of ​​winter wheat with corn stalks returning to the field was large The frost damage, a direct impact