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秸秆覆盖能够减少土壤水分的蒸发。为了确定秸秆网合理的初始厚度及用量,分别从含水率变化、累积蒸发量、蒸发失水比方面进行分析比较,结果表明:在低用量条件下,各处理系统水分蒸发量与秸秆网厚度呈负相关;在高用量条件下,秸秆网初始厚度为5mm的处理系统水分蒸发最慢,保水效果最好,10mm的秸秆网处理系统水分蒸发最快;随着秸秆网用量的增加,系统水分蒸发减少,结合经济效益,600g/m2的秸秆网覆盖能够达到较好的保水效果。
Straw mulching reduces soil moisture evaporation. In order to determine the reasonable initial thickness and amount of straw net, the paper analyzed and compared the changes of moisture content, cumulative evaporation and evaporation loss ratio respectively. The results showed that under the low dosage conditions, the moisture evaporation amount and straw net thickness Negative correlation; when the amount of straw net was increased, the moisture evaporation of the system with the initial thickness of 5mm was the slowest, the water retention was the best, and the water evaporation of the 10mm straw net was the fastest; Reduce, combined with economic benefits, 600g / m2 of straw net coverage can achieve better water retention effect.