中文摘要：

通过室内模拟试验，研究了砂壤土浅层添加不同粘量对土壤蒸发速率、累积蒸发量、土壤剖面含水率的影响，并分析了土壤中粘粒质量分数对砂壤土水分蒸发过程的影响和机制。结果表明，土壤表层掺粘量越多，第一蒸发阶段维持时间越久；蒸发第二阶段，O％、2％、5％、lO％、20％掺粘处理下绝对日蒸发量均随着掺粘量的增加而增加。相对蒸发速率转折时间与绝对蒸发速率一致。第一蒸发阶段，掺粘量越大，相对蒸发速率越小；蒸发第二阶段，掺粘量越大，蒸发趋势越大。蒸发第一阶段，各掺粘处理绝对累积蒸发量差异不大；第二蒸发阶段，绝对累积蒸发量均随着掺粘量的增加而增加。不同掺粘处理下绝对累积蒸发量与蒸发时间呈对数函数关系。相对累积蒸发量随着掺粘量的增加而减小。不同掺粘处理下相对累积蒸发量与时间呈一元二次函数关系。蒸发结束后，掺粘处理土壤剖面含水率均高于对照，剖面含水率随着掺粘量的增加而增加，且在砂壤土和掺粘层有一个转折点。

英文摘要：

Through the simulated experiments indoor, the effects of adding clay to shallow sandy loam on soil evaporation intensity, cumulative evaporation and soil water contents in profiles were studied, and the effects of clay particle concentration on the evaporation process of sandy loam as well as the mechanism were analyzed. The results indicated that the more amount of adding clay, the longer the evaporation time in the first stage. The absolute diurnal evaporation increased with the increase of adding clay amount under the adding clay amounts of 0%, 2%, 50%, 10% and 20% in the second evaporation stage. The turning times of relative evaporation intensity and absolute evaporation intensity were consistent. The more adding clay amount, the lower the relative evaporation intensity in the first evaporation stage, while the more adding clay amount, the higher the relative evaporation intensity in the second evaporation stage. The differences of absolute cumulative evaporation were not obvious between treatments in the first stage of evaporation while the absolute cumulative evaporation increased with the increase of adding clay amount in the second stage of evaporation. There were good logarithmic functions between absolute cumulative evaporation and evaporation time while there were quadratic equations between relative cumulative evaporation and evaporation time under different amounts of adding clay. After evaporation , soil water contents in profiles were higher under the treatments of adding clay to sandy loam than those in the control, soil water content increased with the increase of adding clay amount, and there was a turning point in the sandy loam layer and adding clay layer.