【摘要】 高寒草甸是高原上适合高寒草甸形成的气候层带在其下垫面上“投影”的产物 .在垂直带中 ,高寒草甸分布的上下限是上述气候层带上下限的指示 .高寒草甸下限分布趋势面与高原基面趋势面相交的闭合曲线区是高寒草甸在高原上水平分布的范围更多还原

【Abstract】 The uplifting of Qinghai-Xizang Plateau leads to the occurrence of the unique atmo- sphere circulation on the plateau proper and the formation of various climatic layer-belts which are favorable to the relative alpine vegetation.Alpine meadow occurs where the climatic layer-belt favorable to alpine meadow acts on its underlying surface.On various altitudinal belts,the upper and lower limits of alpine meadow rightly indicate the upper and lower limits of the aforesaid climatic layer-belt.The intersecting curve between the upper and lower trend-surface of alpine meadow shows the disappearing of alpine mead- ow on altitudinal belts towards the northwest.Inside the intersecting curve between the trend-surface of lower limit of alpine meadow and that of the plateau′s base surface is the region where alpine meadow horizontally occurs.Alpine meadows both on altitudinal and horizontal belts coexist in the mentioned climatic layer-belt.Towards the north- west,alpine meadow differentiates as alpine shrub-meadow,typical alpine meadow and alpine steppe-meadow parahorizontally.Also,with the increase of the altitude in the lay- er-belt,the variety of plants becomes simpler.更多还原