| 海拔梯度下的江孜沙棘(Hippophea gyantsensis)群落物种多样性分布格局 |
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| 引用本文： | 欧珠朗杰,拉琼,索朗白珍,扎西次仁.海拔梯度下的江孜沙棘(Hippophea gyantsensis)群落物种多样性分布格局[J].西藏大学学报,2008(2). |
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| 作者姓名： | 欧珠朗杰 拉琼 索朗白珍 扎西次仁 |
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| 作者单位： | 西藏大学理学院; |
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| 基金项目： | 国家自然科学基金项目“西藏沙棘海拔递度性适应与变异”阶段性成果,项目号:30560027 |
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| 摘 要： | 文章通过样方调查方法,沿着海拔梯度对拉萨河谷上段江孜沙棘(Hippophea gyantsensis)群落的物种多样性分布格局进行了研究。从海拔3850m至4200m共设置了4个样带,11个样方,记录了每个样方内的维管束植物物种组成,江孜沙棘盖度和每个样方的海拔高度。利用回归分析方法发现,江孜沙棘群落物种多样性随着海拔升高而升高,而随着江孜沙棘的盖度的增加而降低。造成这种分布格局的主要原因可能是湿度和光照两个生态因子。随着海拔的上升,生境内的湿度在增加,物种多样性增大,而江孜沙棘盖度的增加,导致林内光照减弱,其结果是群落内的物种多样减小。
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| 关 键 词： | 江孜沙棘 群落 物种多样性 海拔 盖度 |
The Distribution Pattern of Species Diversity of Hippophea gyantsensis Community Along an Altitudinal Gradient in Lhasa Valley |
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| Ngudrub Namgye Lha Chun Sonam Baidron Tashi Tsering.The Distribution Pattern of Species Diversity of Hippophea gyantsensis Community Along an Altitudinal Gradient in Lhasa Valley[J].Journal of Tibet University,2008(2). |
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| Authors: | Ngudrub Namgye Lha Chun Sonam Baidron Tashi Tsering |
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| Institution: | School of science;Tibet University;Lhasa 850000 |
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| Abstract: | A total of 11 altitudinal plots were set along four-altitudinal bands from the altitude of 3850m to 4200m in Lhasa valley.In each plot all vascular plant species were recorded,coverage of Hippophea Rhamnoides and altitude of each plots were measured.The regression analysis was performed to find relationship between species richness and altitude,as well as coverage of H.rhamnoides.The results showed that with increasing altitude,species richness of H.rhamnoides community increased,while with increasing cover... |
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| Keywords: | Hippophea gyantsensis community species diversity altitude coverage |
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