秸秆覆盖条件下土壤水分蒸发的动力学模型

通过室内模拟试验,建立了不同秸秆覆盖量下的土壤水分蒸发动力学模型,并对不同水分条件下秸秆覆盖量与土壤水分蒸发的关系进行了研究。结果表明,土壤水分累计蒸发量W与时间t的关系为W=a·tb,当初始含水量较高时,秸秆覆盖的保水效果十分明显,而且秸秆覆盖量越多,保水效果越好;当初始含水量较低时,秸秆覆盖的保水效果更加显著,但其保水效果与秸秆覆盖量的多少关系不大。

Dynamics model of moisture evaporation of soil covered by stalks

The Dynamical models of soil moisture evaporation under conditions with varied quantity of crop stalk mulch were developed on simulative trial in lab,and the relation of soil moisture evaporation to the quantity of stalks applied under different moisture contents was studied.The result showed that the relationship of the soil water evaporation (W) and the time (t) is W=a·t^b,the effect of crop stalk mulch on preventing water loss is visible,the more the quantity of crop stalk mulch is applied,the more visible the effect of water conversation is when the initial soil moisture content was high;and the effect of water conversation is greater when the initial soil moisture content was little,however,there is almost no relation between the effect of water conversation and the quantity of crop stalk mulch.