试验研究表明,秸秆覆盖可改变作物耗水规律。即前期能抑制土壤蒸发,减少土壤水分无效消耗;后期则增强植株蒸腾,促进于物质积累,使农田耗水由物理过程向生物学过程转化,有利于提高产量和作物水分利用效率。不同覆盖期和不同土壤水分条件下覆盖效果不同,土壤含水量55％～70％的麦田覆盖效果最佳,覆盖时间以冬小麦进入越冬期停止生长时覆盖为宜。 Experimental studies show that straw mulching can change the law of water consumption of crops. In the early stage, the evaporation of soil was inhibited and the ineffective consumption of soil moisture was reduced. In the latter stage, the transpiration of plants was enhanced, the accumulation of material was promoted, and the water consumption of farmland was transformed from physical process to biological process, which was beneficial to increase yield and crop water use efficiency. Under different coverage periods and different soil moisture conditions, the coverage effect was different. The wheat field with the soil moisture content of 55% ~ 70% had the best coverage effect. The coverage time was the best when the winter wheat entered the winter and stopped growing.