植物混掺物对甘肃景泰砂壤土蒸发的影响

Effects of plant additive on the soil water evaporation with sandy loam

为探讨土壤中添加植物混掺物对土壤水分蒸发规律的影响,通过室内试验测定土壤水分特征曲线、非饱和土壤水扩散率以及累积蒸发量等参变量,研究不同混掺物及不同混掺比例在不同埋深条件下对土壤水分蒸发的影响.结果表明：指数函数能较好地描述含有混掺物的土壤水扩散率;玉米芯的吸水保水能力强于玉米叶,而玉米叶的阻滞水分蒸发的能力优于玉米芯;3％混掺比例和土壤上层0～5 cm埋深处理的组合能有效减少土壤水分蒸发.

In order to study the effect of adding plant additive on the law of soil water movement,different plant additives and adding proportions in different burial depth was studied through determining some parameters like soil water characteristic curve,unsaturated soil water diffusivity and cumulative evaporation in the laboratory.The results showed that the relationship between soil moisture diffusivity and soil water content can nice described by an exponential function.The water absorbing capacity and water conservation capacity of the corn cob was better than corn leaves,the resistant ability of corn leaves was better than corn cob.The treatment with 3％ plant additive and 5 centimeter thick in the soil surface 0-5 cm can reduce the soil moisture evaporation effectively.