摘要
以东祁连山高寒地区山生柳种群为研究对象 ,从山生柳克隆种群在基株和分株 2个层次上进行年龄结构的分析。研究结果表明 ,各样地基株种群中 ,Ⅰ龄级的幼苗均较缺乏 ,Ⅳ龄级向Ⅴ龄级过渡处为死亡高峰期 ,Ⅲ、Ⅵ龄级个体所占比重最大 ;克隆分株种群总体呈增长型 ;从种群动态方面分析 ,山生柳克隆种群年龄结构与海拔梯度间有一定相关联系 :海拔 30 5 0m处 ,基株种群和分株种群呈衰退型 ;310 0～ 32 5 0m间 ,种群表现为增长型 ;330 0～ 345 0m 。
The age structure of Salix oritrepha genet and ramet population were analyzed in alpine area of east Qilian Mountain. The results showed that there was a shortage of the first age class seedlings and most of trees were belonged to the third and forth age classes in ramet population; a number of ramet populations were status of increment; the age structure of genet and ramet populations was decline pattern in 3 050m altitude, and increment pattern from 3 100m to 3 250m, steady pattern from 3 300m to 3 450m.
出处
《草业科学》
CAS
CSCD
2002年第3期12-16,共5页
Pratacultural Science
基金
甘肃省教育厅项目"东祁连山高寒灌丛生态系统特征及其放牧管理策略"(9680 473 )的部分研究内容
