西藏色季拉山林线薄毛海绵杜鹃种群分布  

Distribution pattern of Rhododendron aganniphum var.schizopeplum population at the timberline of Sejila Mountains,Tibet of China.

作　　者：郭其强[1,2] 罗大庆[1,2] 卢杰[1,2] 马和平[1,2] 

机构地区：[1]西藏农牧学院高原生态研究所,西藏林芝860000 [2]西藏林芝森林生态系统定位研究站,西藏林芝860000

出　　处：《应用生态学报》2013年第5期1329-1334,共6页Chinese Journal of Applied Ecology

基　　金：西藏林芝森林生态系统定位研究项目(2012-LYPT-DW-016);西藏大学农牧学院‘211工程'重点学科建设项目[XZA-211-0713-A;211(3)-071012-06];西藏自治区科技厅基金项目(2013)资助

摘　　要：薄毛海绵杜鹃是西藏东南部地区高山林线灌丛的优势种,在色季拉山分布在海拔4300～4500 m.通过样地调查和基径结构分析,研究了色季拉山林线薄毛海绵杜鹃种群分布.结果表明:随着海拔升高,薄毛海绵杜鹃种群密度增加而高度降低;在同一海拔,阴坡的种群密度和高度大于阳坡,而基径较小.在阴坡和阳坡,薄毛海绵杜鹃种群年龄结构的峰值均呈"∩"型曲线,中龄级个体较多,幼苗、幼树相对不足.薄毛海绵杜鹃种群的种内竞争呈波浪式发展,强度为阴坡高于阳坡,且存在自疏现象.Rhododendron aganniphum vat. schizopeplum grows at the elevation of 4300-4500 m in Sejila Mountains, being a dominant species of shrub layer at the timberline of southeast Tibet. Based on the sampling plot investigation and basal diameter structure analysis, this paper studied the distribution pattern of R. aganniphum var. schizopeplum population at the timberline of Sejila Mountains. With the increase of altitude, the population density of R. aganniphum var. schizopep- lure increased, but the population height decreased. At the same altitudes, the population density on the shady slope was larger than that on the sunny slope, while the basal diameter was smaller. On the two slope directions, the＇distribution of the basal diameter classes of the population appeared as ＂ N＂ shape, i. e. , middle-aged individuals were more, while seedlings and saplings were rela- tively less. The intraspeeific competition of R. aganniphum var. schizopeplum population was in the form of wave, being stronger on shady slope than on sunny slope, and existing self-thinning.

关 键 词：西藏 薄毛海绵杜鹃 林线 种群分布 

分 类 号：S685.21[农业科学—观赏园艺]