地形对澜沧江源区高寒草甸植物丰富度及其分布格局的影响

被引：30

作者：

张昌顺 ^{[1
]}

谢高地 ^{[1
]}

包维楷 ^{[2
]}

陈龙 ^{[1
,3
]}

裴厦 ^{[1
]}

范娜 ^{[1
]}

机构：

[1] 中国科学院地理科学与资源研究所

[2] 中国科学院成都生物研究所

[3] 北京市环境保护科学研究院

来源：

生态学杂志 | 2012年 / 31卷 / 11期

关键词：

澜沧江源区; 高寒草甸; 分布格局; 物种丰富度; 地形; 典范对应分析;

D O I：

10.13292/j.1000-4890.2012.0443

中图分类号：

S812 [草地学、草原学];

学科分类号：

090503 ; 0909 ;

摘要：

在澜沧江源区进行了大范围的植物群落调查,应用回归拟合和典范对应分析(CCA),研究地形因子(海拔、坡度、坡向和坡位)对高强度人为干扰和全球气候变化条件下源区高寒草甸植物物种丰富度及植物分布的影响。结果表明:(1)在55个样地275个1m×1m的小样方中,共出现150种植物,在1m2样方内物种数最多为27种,最少的仅为3种;(2)利用曲线方程进行拟合,物种丰富度分别与海拔和坡度有极显著的相关性,但与坡向和坡位没有显著的关系;(3)CCA第一轴基本上反映了植物群落所处环境的坡度的梯度变化,第二轴基本上反映了坡位的梯度变化,第三轴反映了地形因子的综合作用;(4)按影响程度大小,在高强度人为干扰和全球变化条件下,影响该区域高寒草甸植物种类组成和结构的地形因子从大至小依次为坡度、坡位、海拔和坡向,反映出坡度是影响源区高寒草甸水土条件的主要因子。

引用

页码：2767 / 2774

页数：8

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