青藏高原不同海拔矮嵩草抗逆性的比较研究

主要对生长在海拔４００ｍ（大坂山），３２００ｍ（海北部）和２２００ｍ（西宁）的地区同矮嵩草的生理生态适应特性进行了比较研究。结果表明：生长在３个不同海拔地区的矮嵩草其生长发育和干物质和积累具有明显差异，随着海拔高度的增加，植株高度明显变低，叶面积、叶绿素含量和干物质积累减少；类胡萝卜素和类黄酮含量增加；光合速率、光饱和点和补偿点提高；光呼吸强度减弱。在花果前期，海拔４０００ｍ处植株地上组织的蔗糖、

COMPARATIVE STUDY ON THE RESISTANCE OF Kobresia humilis GROWN AT DIFFERENT ALTITUDES IN QINGHAI XIZANG PLATEAU

The paper reports comparative studies on the physiological ecological adaptiveness of K. humilis grown at different altitudes (Daban Mt.4000m a.s.l.; HaiBei station 3200m a.s.l.and Xizang 2200m a.s.l.) in Qinghai Xizang Plateau. Results showed that growth and matter accumulation of K.humilis at different altitudes had obvious differences. Plant height, leaf area, content of chlorophyll and dry matter of plants tended to decrease with increasing altitude. the content of carotentoid and flavonoid, photosynthetic rate, light compensation point and light saturation point of plants increase with increasing altitude, and photorespiration rate declined. The content of sucrose, fructose, glucose and the total soluble sugar of aboveground tissue of plants grown at Daban Mt.increased by 65.4%, 110.2%,121.6% and 84.6%,as compared with that of Haibei station respectively during exuberance. The belowground tissue increased by 5.6%,17.8%,88.6% and 43 8% respectively. In addition, the content of sucrose, fructose. glucose and the total soluble sugar of belowground tissue of plants from Dabann Mt.and Haibei station was higher than that of aboveground tissue during winthering I. At the smae time, the peroxidase activity in the leaf of plants from Daban Mt.and Haibei station was increased 90.0% and 28.1% in average than that of Xining respectively. The results demoustrated that plants grown at higher altitude in Qinghai Xizang Plateau possess stronger resistance and adaptiveness. It is clear that the physiological ecological characteristics of K.humilis were associated with its specific structure, with increase of cold resistant matter and peroxidase activity.