The Qinghai-Xizang Plateau is a unique physico-geographical region on the earth. As a whole, the spatial differentiation of physico-geographical regions of the plateau is mainly determined by topographic configuration...The Qinghai-Xizang Plateau is a unique physico-geographical region on the earth. As a whole, the spatial differentiation of physico-geographical regions of the plateau is mainly determined by topographic configuration and atmospheric circulation, warm and humid in the southeast, cold and arid in the northwest. The natural landscapes apppear in the following succession: forest → meadow → steppe → desert. The system of physico-geographical regions of the plateau is demarcated on the principle of bio-climate or the principle of three dimension zonality. Based on the thermal conditions, moisture regimes and variation in landform the Qinghai-Xizang Plateau is sequentially demarcated. The duration of mean daily temperature above 10℃ is the principal index, the subsidiary criterion is mean temperature of the warmest month, two temperature belts may be divided: plateau subpolar and plateau temperate. Annual aridity is taken as the principal index, subordinated by annual precipitation. Four moisture regional types are identified: humid, subhumid, semiarid and arid. A tentative scheme of 2 temperature belts, 10 natural zones and 28 physical districts has been proposed not including southern slopes of the East Himalayas (montane subtropical, humid).展开更多
基金Project supported by the China Climbing Project.
文摘The Qinghai-Xizang Plateau is a unique physico-geographical region on the earth. As a whole, the spatial differentiation of physico-geographical regions of the plateau is mainly determined by topographic configuration and atmospheric circulation, warm and humid in the southeast, cold and arid in the northwest. The natural landscapes apppear in the following succession: forest → meadow → steppe → desert. The system of physico-geographical regions of the plateau is demarcated on the principle of bio-climate or the principle of three dimension zonality. Based on the thermal conditions, moisture regimes and variation in landform the Qinghai-Xizang Plateau is sequentially demarcated. The duration of mean daily temperature above 10℃ is the principal index, the subsidiary criterion is mean temperature of the warmest month, two temperature belts may be divided: plateau subpolar and plateau temperate. Annual aridity is taken as the principal index, subordinated by annual precipitation. Four moisture regional types are identified: humid, subhumid, semiarid and arid. A tentative scheme of 2 temperature belts, 10 natural zones and 28 physical districts has been proposed not including southern slopes of the East Himalayas (montane subtropical, humid).
