毛乌素沙地东南缘不同植被盖度下土壤水分特征分析

The characteristics of soil water in different vegetation coverage on the southeastern margin Mu us sandy land

2007年利用EC-5土壤水分探头对毛乌素沙地东南缘土壤水分进行了定位观测,分析了不同植被盖度下土壤水分的时空分布特征及土壤蓄水量的差异。结果表明:在时间尺度上,固定沙地土壤水分含量表现为:秋季>春季>夏季,半固定沙地和流动沙地土壤水分含量为:夏季>秋季>春季。在垂直方向上,固定沙地整个剖面土壤水分变化成"S"型曲线变化,半固定沙地和流动沙地土壤水分成反"S"型曲线变化。0～200cm沙层中,流动沙地土壤蓄水量最大,半固定沙地次之,固定沙地最差。

The soil water on southeastern margin in mu us sandy land had been observed. The difference of soil water storage capacity and spatial and temporal distribution of soil water had been analyzed in different vegetation coverage. The results showed that on time scales, the soil water content in fixed sandy land is autumn 〉 spring 〉 summer, but in semi fixed dune and moving dune the soil water content is summer 〉 autumn 〉 spring. On vertical, in whole profiles, the Varity of soil water content in fixed sandy land forms a S curve, but in semi fixed dune and moving dune soil water content form a anti -S curve. In 0 -200cm sand layer, the soil water storage capacity in moving dune is the largest, in fixed sandy land that is the least, and the number of that in semi fixed dune is in the middle of those three types.