砂石与秸秆覆盖对风沙土水分蒸发特性的影响

Effect of Sand and Straw Mulching on the Water Evaporation Characteristics of Aeolian Sandy Soil

探究不同厚度的砂石和秸秆覆盖对辽西北风沙土土壤水分蒸发的影响机理,特别是在不同初始含水率下的影响,并探索抑制辽西北风沙地土壤水分蒸发的最佳模式,也为风沙区植被建设提供理论基础。首次以辽西北风沙土为研究对象,运用自行设计的蒸发桶进行为期20天的室内蒸发模拟试验,研究土壤蒸发量随蒸发时间的变化规律。结果表明,砂石与秸秆覆盖能够抑制土壤水分蒸发,随着初始含水率增大,砂石与秸秆覆盖厚度越厚,其保持土壤水分的效果就越强。

Exploring the influence mechanism of different thickness of sand,gravel and straw cover on soil water evaporation in the wind-blown sandy soil in northwest Liaoning Province,especially under different initial water content,and exploring the best model to inhibit soil water evaporation in the wind-blown sandy soil in north western Liaoning Province,which can provide a theoretical basis for vegetation construction in the wind-blown sandy area.For the first time,taking the Aeolian sandy soil in the northwest of Liaoning Province as the research object,a 20-day indoor evaporation simulation experiment was carried out with a self-designed evaporation barrel to study the variation of soil evaporation with evaporation time.The results show that the sand,gravel and straw mulching could inhibit soil water evaporation,and the thickness of mulching and initial soil moisture content were closely related to this inhibition.With the increase of initial moisture content,the greater the coverage thickness of sand and straw,the smaller the cumulative evaporation of soil,and the more stable the evaporation intensity of soil.