青藏高原地区矮嵩草草甸植物群落生长分析  

Plant growth analysis of Kobresia humilis meadow community in Qingzang plateau regions

作　　者：师生波[1] 贲桂英[1] 韩发[1] 李英年[1] 沈振西[1] 

机构地区：[1]中国科学院西北高原生物研究所,西宁810001

出　　处：《生态学报》2001年第6期871-876,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金!( 3 9570 1 2 9);国家基础研究规划!( 1 9980 4 0 80 0 );中国科学院"九五"重点及特别研究!( KZ951 -Al-2 0 4

摘　　要：对中国科学院海北高寒草甸生态系统定位站地区的矮嵩草草甸植物群落进行了函数生长分析研究。叶面积和地上生物量采用三次多项式的指数方程拟合。研究结果表明 ,LAI的增长过程呈 S形 ,可分为 3个时期 ,与群落中莎草类植物的物候划分相一致 ;6月至 8月上旬 LAI的增长速率较高 ,约持续 70 d,最大 LAI为 3 .5左右 ;ULR与 LAI的变化趋势相反 ,受两者的共同影响 ,CGR在 6月下旬最大 ;地上净初级生产量的增加在 6月下旬左右最大 ,从 5月中旬至 7月下旬的 80余天时间内 ,矮嵩草草甸可生产的地上净生物量约占年地上总生物量的 92 .5% ;生长季节内具有相对丰富的降雨和适宜的温度 ,是保证植物完成生长发育过程的有利因素。The experiment of plant growth analysis of Kobresia humilis meadow community was conducted in the region of Haibei Alpine Meadow Ecosystem Research Station(37°29′～37°45′N.,101°12′～101°33′E;EL.3200m).The series of data were fitted with cubic polynomial exponential growth curves.The results indicated(1):The change of LAI was S type,the growth course can be divided into three periods,which was corresponded to the phenological periods of plants of sedges in K.humilis meadow.From June to the first ten days of August,the increasing of LAI was very quick.The highest LAI was about 3.50;(2)The CGR was influenced by both ULR and LAI ,which had different trend during the plant growing season,so that the CGR was higher in last ten days of June;(3)The W was also higher in last ten days of June.From second ten days of May to the last ten days of July,the yield of aboveground was accumulated very quickly,and that could occupy to 92.5% of the total annual yield;(4)During the plant growing season,there is much more precipitation than other months and the temperature is also sultable for plant growth so these condition ensure the plants to go throngh their life cycle.

关 键 词：青藏高原 矮嵩草草甸 生长分析 植物群落 

分 类 号：Q948.15[生物学—植物学] Q948.43