半湿润易旱区土壤水分时空变化特征研究

发布时间：2018-09-11 17:43

【摘要】：为了研究半湿润易旱区土壤水分时空变化特征,在陕西关中盆地的三原县选择试验点,对地面以下0~500cm土层水分进行原位、定点长期自动监测。根据土壤水分变化状况从垂直剖面上将土壤划分为活跃层(0~20cm)、次活跃层(20~50cm)、过渡层(50~200cm)、相对稳定层(200~500cm)。其中,活跃层、次活跃层土壤水分受到气象因素的影响较大,12月及1-3月中旬处于相对稳定期、3月下旬-5月中旬处于缓慢下降期、5月下旬-9月下旬处于增失交替期、10月初~11月末处于持续下降期;过渡层土壤水分受到气象因素的影响较小,12-3月末处于先减小后增大的变化趋势,4月初-8月中旬有一定的波动,8月下旬-11月末缓慢下降。相对稳定层土壤水分受到气象因素的影响微弱,主要受到土壤温度的影响,表现出振幅较小的正弦曲线趋势的变化特征。
[Abstract]:In order to study the temporal and spatial variation characteristics of soil moisture in semi-humid arid region, the 0~500cm soil moisture under the ground was monitored automatically for a long time in Sanyuan County, Guanzhong Basin, Shaanxi Province. Soil was divided into active layer (0~20cm), secondary active layer (20~50cm), transition layer (50~200cm) and relative stable layer (200~500cm) according to soil moisture change. The active layer, The soil moisture in the secondary active layer was influenced by meteorological factors, which was relatively stable in December and mid-January, slowly declined from late March to mid-May, and continued to decline in late May and late September during the beginning of October and the end of November. The effect of meteorological factors on soil moisture in the transitional layer is relatively small. The change trend of soil moisture in the transition layer is from the beginning of April to the middle of August, and then from the end of August to the end of November, and then decreases slowly from the end of August to the end of November. The soil moisture in the relative stable layer was influenced by meteorological factors, but mainly by soil temperature, which showed the variation of sinusoidal trend with smaller amplitude.
【作者单位】：长安大学环境科学与工程学院;长安大学水与发展研究院;长安大学旱区地下水文与生态效应教育部重点实验室;西安理工大学水利水电学院;
【基金】：中央高校基本科研业务专项(310829161003) 高等学校学科创新引智计划(“111”)项目“干旱半干旱地区水文生态与水安全学科创新引智计划项目”(B08039)
【分类号】：S152.7

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