藏北高原土壤温度分布的纬向效应和高度效应

THE LATITUDE AND ELEVATION EFFECTS OF THE GROUND TEMPERATURE DISTRIBUTION IN NORTHERN TIBET PLATEAU

利用ＧＡＭＥ－ Ｔｉｂｅｔ 野外观测期间所得藏北高原不同地点土壤温度资料， 对藏北高原土壤温度分布纬向地带性和垂直地带性特征进行分析， 结果表明夏季土壤温度分布主要表现为高度效应，而冬季土壤温度分布主要表现为纬度效应。年平均土壤温度分布是纬度效应和高度效应综合作用的结果。

Based on the ground temperature data at different sites in the Northern Tibetan Plateau obtained during the GAME_Tibet field observation, the features of the latitude effect and elevation effect of the ground temperature in the Northern Tibetan Plateau were analyzed. The results demonstrated that the spatial distribution of the ground temperature in the Northern Tibetan Plateau was influenced by different factors in different season. The distribution feature of the ground temperature is elevation effect in summer (August) and latitude effect in winter (January), while the distribution feature of the annual mean ground temperature is the synthetical results of the elevation and latitude effects. However, at any time, the spatial distribution of the ground temperature is not only influenced by elevation and latitude simultaneously, but also by synoptic processes, especially,by seasonal snow cover. The heterogeneity of the seasonal snow cover distribution, namely, there were snow cover at some sites but not at other sites at the same period, could influence the spatial distribution of the ground temperature significantly. Anyhow, all sites still continue. According to much more and detailed data, the elevation effect and latitude effect of the spatial distribution of the ground temperature in the Northern Tibetan Plateau will be studied further.