基于SMOS的黄土高原区域尺度表层土壤水分时空变化

Spatial Variability of Surface Soil Moisture at a Regional Scale in the Loess Plateau Based on SMOS

用SMOS土壤水分数据、MODIS植被指数数据和TRMM月降水数据,通过对黄土高原区域尺度表层土壤水分含量时空变化的研究,对表层土壤水分的时空变化特征及其对降水的响应进行了分析。结果表明:黄土高原表层土壤水分空间分布主要表现为西部和东北部低、东南部较高。青海石质高山区及山西西南部等区域土壤水分含量与整个区域存在差异。黄土高原西部与河套平原部分区域表层土壤水分含量季节性变化较大。在不同降水条件下,土壤水分含量与降水量相关性呈显著差异。

SMOS soil moisture data, MODIS vegetation index data and TRMM monthly precipitation data of the Loess Plateau were collected to study the spatial and temporal variability of surface soil moisture and its response to rainfall at a regional scale. The results show that the spatial distribution of surface soil moisture was low in west and northeast, while high in the southeast. The surface soil moisture in Qinghai rocky moun- tain area and the southwest in Shanxi province were different from the whole area. The surface soil moisture in the western of the Loess Plateau and the part of Hetao Plain had greater seasonal changes. Under differ- ent rainfall conditions, the correlation between surface soil moisture and precipitation posed a significant difference.