青海湖湖盆南部的植被与海拔梯度

研究地区主要植被类型有三类,即温性草原、高寒灌丛和高寒草甸。温性草原主要分布于研究地区东段湖滨平原上;高寒灌丛分布于山地一定海拔范围内（３４００－３８００ｍ）：高寒草甸主要分布于海拔３８００－４２００ｍ之间,群落中优势种的重要值沿海拔梯度呈“钟型”或近似“钟形”变化趋势,即优势 沿海拔梯度分布上有一最适区,但不同种群其最适区彼此分离;而优势种在其分布区边缘则常常相叠,表明群落之间并无明显界限,这与

VEGETATION AND ALTITUTE GRADIENT IN SOUTHERN PART OF QINGHAI LAKE BASIN

There are three main vegetation types in the studyed area, they are warm steppe,alpine shrub and alpine meadow. The warm steppe is distributed mainly on the east partof the shore;the alpine shrub is distributed between 3400- 3700 m above sea level;andthe alpine meadow is distributed widely in the west part, there are also have alpinemeadow on the east part above 3700 m. The shapes of dominant species responsingcurves to altitute gradient are "Bell-shaped". The shapes of the variations of and diversities along altitute gradient are "bell-shaped",at about 3400 m above sea level,theyshow the boggest values. The water and theat conditions and their combination are likelythe main factors affecting the characteristics and distribution of vegetation in thestudyed region.