摘要
以漓江上游流域为研究区域,利用较高空间分辨率的Landsat 8 TIRS数据定量反演流域的地表温度,并结合温度-植被干旱指数探讨干旱季节流域地表土壤干旱时空分布特征。结果表明:不同干旱季节,漓江上游流域地表温度分布规律类似,即以林地为主的上游流域地表温度低于以城乡工矿居民用地为主的中下游区域;流域地表土壤以干旱等级为主,部分区域出现极干旱现象,在一定程度上会影响区域农业和旅游业的可持续发展。流域地表土壤干旱程度受土地利用类型影响明显,以林地为主的上游区域地表土壤主要为湿润等级,而以城乡工矿居民用地为主的中下游区域主要为干旱等级。
In this study, we used the thermal infrared sensor(TIRS) data of Landsat 8 to retrieve land surface temperature(LST) by an improved mono-window algorithm(IMW), and estimated the surface soil dryness status and its distribution pattern with temperature-vegetation dryness index(TVDI) combined with LST and Normalized Difference Vegetation Index(NDVI) in the upper Lijiang River basin. The results showed that the temporal and spatial pattern of LST was similar in different drought seasons. The LST was higher in the middle and downstream areas of the upper Lijiang River basin, while the LST was lower in the headstream areas occupied by forest. According to the status of surface soil dryness classified by TVDI, the upper Lijiang River basin displayed adrought condition. Some areas especially urban areas were extremely drought. The drought condition in dry season would impede the sustainable development of irritation agriculture and tourism in the Lijiang River basin. The surface soil dryness was influenced significantly by land use change in the upper Lijiang River basin, with wet status in forest areas and drought status in urban areas.
引文
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