采用三维数学模型研究了青藏高原东南部自然带垂直分布规律,影响垂直带分布的主要因子是热量条件。常绿阔叶林带、针阔叶混交林带、山地暗针叶林带和高山灌丛草甸带上限的温暖指数、寒冷指数分别为65℃·月、43℃·月、16℃·月和10℃·月及-10℃·月、-24℃·月、-55℃·月和-75℃·月;其可能蒸散值分别为620mm、500mm、410mm和300mm。
With the three-dimensional mathematical model, namely, H=exp(a+bx+cx2+dy+ey2),the vertical distribution laws of natural belts in the southeastern part of the Qinghai-Tibet Plateau are studied in this paper. The warmth index (WI) and cold index (CI) of the upper limits of the evergreen broad-leaf forest, the coniferous and broad-leaf mixed forest, the montana dark coniferous forest, and the alpine shrub and meadow belt are 65℃ · month,43℃· month, 16℃· month and 10℃·month, and -10℃·month, -24℃· month,-55℃ month and -75℃· month respectively. The potential evaporation values of them are 620mm, 500mm, 410mm and 300mm respectively.