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| DOI：10.13522/j.cnki.ggps.2017.0357 |
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| Analysis of the Factors Affecting the Spatiotemporal Soil Moisture Distribution Based on the Temperature-vegetation Drought Index |
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GUO Ruining, GUO Qingxia, FENG Yuhao, HE Peng
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College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China
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| Abstract: |
| 【Objective】 This paper aims to present a new method to estimate the spatiotemporal distribution of soil moisture in the loess hilly and gully regions. 【Method】 We used the Temperature-vegetation Drought Index (TDVI) and GIS to qualitatively analyze the spatial distribution of soil moisture during vegetative growing season, as well as the impact of land coverage, altitude and precipitation on TDVI using the Landsat8 remote sensing images of Chakou watershed. 【Result】 Soil moisture remained semiarid and arid regime during the vegetative growing season. Spatially, the soil moisture was low in the central region, moderate in the southeast, and wet in the northwest of the watershed. The land with arbors showed highest soil moisture and the sloping croplands had the lowest water content. The value of TDVI increased with altitude and the TS was negatively correlated to the soil moisture. 【Conclusion】 TDVI can be applied to estimate soil moisture in the loess hilly and gully as shown for the Chakou watershed. |
| Key words: soil moisture; vegetation index; land surface temperature; Landsat8; watershed |
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