西藏色季拉山林线薄毛海绵杜鹃种群分布

应用生态学报

西藏色季拉山林线薄毛海绵杜鹃种群分布

郭其强^1,2,罗大庆^1,2**,卢杰^1,2,马和平^1,2

(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)

出版日期:2013-05-18 发布日期:2013-05-18

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

GUO Qi-qiang^1,2, LUO Da-qing^1,2, LU Jie^1,2, MA He-ping^1,2

(¹Institute of Plateau Ecology, Tibet Agricultural and Animal Husbandry College, Linzhi 860000, Tibet, China; ²National Key Station for Field Scientific Observation & Experiment, Linzhi 860000, Tibet, China)

Online:2013-05-18 Published:2013-05-18

摘要/Abstract

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.

Abstract: Rhododendron aganniphum var. 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. schizopeplum 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 “∩” shape, i.e., middleaged individuals were more, while seedlings and saplings were relatively less. The intraspecific 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.

郭其强1,2,罗大庆1,2**,卢杰1,2,马和平1,2. 西藏色季拉山林线薄毛海绵杜鹃种群分布[J]. 应用生态学报.

GUO Qi-qiang1,2, LUO Da-qing1,2, LU Jie1,2, MA He-ping1,2. Distribution pattern of Rhododendron aganniphum var. schizopeplum population at the timberline of Sejila Mountains, Tibet of China.[J]. Chinese Journal of Applied Ecology.