| 引用本文: | 郭瑞宁,郭青霞,冯雨豪,等.基于TVDI的土壤湿度时空分布及影响因子分析[J].灌溉排水学报,2018,37(4):51-58. |
| GUO Ruining,GUO Qingxia,FENG Yuhao,et al.基于TVDI的土壤湿度时空分布及影响因子分析[J].灌溉排水学报,2018,37(4):51-58. |
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| 摘要: |
| 【目的】实现对黄土丘陵沟壑地区土壤湿度时空分布变化的监测。【方法】基于2015年生长季4期Landsat8遥感影像，以岔口流域为例，利用温度植被干旱指数（TVDI）和GIS技术，定性地揭示了生长季土壤湿度的时空分布格局，并进一步分析了植被覆盖、地形和降雨等对TVDI的影响。【结果】岔口流域生长季土壤湿度总体上以半干旱为主（0.6＜TVDI＜0.8），以干旱为辅（TVDI＞0.8）；土壤湿度空间格局：干旱区位于中部，偏旱区位于东南部，湿润位于西北部；对于该地区，乔木林的土壤湿度最高，坡耕地土壤湿度最低；TVDI随着随海拔的升高递增；降雨汛期的土壤湿度明显高于其他月份，LST与土壤湿度呈负相关关系。【结论】TVDI应用在黄土丘陵沟壑区取得较好的结果，可以很好地反映该地区土壤湿度的干湿状况。 |
| 关键词: 土壤湿度； 植被指数； 地表温度； landsat8； 流域 |
| 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 |
