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水源林地表温度受植被覆盖度变化的影响,而植被覆盖度变化、干旱引起的地表温度异常又会影响河流水量,研究植被覆盖度对地表温度的影响关系可以监测水源林可能旱情的发生、预测对河流水量的影响。因此,利用遥感反演模型,提取2002年1月5日桂林市灵川县青狮潭水源林ETM遥感图像的植被覆盖度和地表温度,分析冬季水源林植被覆盖度变化对地表温度的影响。结果表明,冬季水源林地表温度随植被覆盖度的增加而升高,呈现明显的正相关关系,但呈现显著的非线性关系,这与夏季水源林地表温度随植被覆盖度的增加而降低恰好相反;相同植被覆盖度的水源林的地表温度存在差异,尤其是阔叶林、竹林、针叶林的地表温度存在差异;受地形的影响相同植被覆盖度的水源林阳坡地表温度高于阴坡、山谷。
The surface temperature of the water source forest is affected by the change of vegetation coverage. The change of vegetation coverage and the abnormal surface temperature caused by drought also affect the water quantity of rivers. The relationship between vegetation coverage and surface temperature can monitor the possible drought occurrence in water source forests. Impact on river water. Therefore, using remote sensing inversion model, the vegetation coverage and surface temperature of the ETM remote sensing image of Qingshitan forest in Lingchuan County, Guilin City, January 5, 2002 were extracted. The effects of changes of vegetation coverage in winter on the surface temperature were analyzed. The results showed that the surface water temperature of the forest was increased with the increase of vegetation coverage in winter, showing a significant positive correlation, but showing a significant nonlinear relationship, which is opposite to the decrease of the surface temperature of the water resource forest in the summer with the increase of vegetation coverage The surface temperature of water source forest with the same vegetation coverage is different, especially the surface temperature of broad-leaved forest, bamboo forest and coniferous forest are different. The surface temperature of sunny slope with the same vegetation coverage is higher than that of the shady slope ,valley.