长鞭红景天主轴生长特性与年龄判定

Rhizome growth characteristics and age determination of Rhodiola fastigiata

长鞭红景天是国家第二批确定的二级保护植物,处于近危状态。在西藏色季拉山区不同海拔带设置样地,观测长鞭红景天花茎环的形成过程,用游标卡尺(IP54型)测量长鞭红景天植株不同年的轴向生长量和径生长量;分析其主轴生长特性,进行年龄判定,结果表明:长鞭红景天每年在主轴上形成一个花茎环结构,并且轴向生长量和径生长量在年际间均无显著差异,但随海拔升高,轴向生长量和径生长量均呈下降趋势。根据长鞭红景天主轴的生长特性,结合主轴的长度则可以判定其年龄,为进一步研究长鞭红景天种群结构及动态奠定基础。

Rhodiola fastigiata is national second-class protected species and in approximately endangered states in China. Increment in length and diameter of rhizome per year were measured using vernier caliper（IP54 type）through observing the scape rings formation of 12. fastigiata in different altitude areas of Tibet Sejila Mountain, and then the growth characteristics of rhizome were analyzed to determine the age. The results showed that：R. fastigiata form one scape rings in the rhizome yearly,furthermore,there was no significant difference in length and diameter of rhizome increment at different years,whereas with the altitude increase,increment in length and diameter of rhizome per year was declining. The R. fastigiata＇s age could be determined according to the rhizome growth characteristics, combining with the length of the rhizome, So this result could lay the of foundation for further population structure and dynamics study of R. fastigiata.