古尔班通古特沙漠南缘优势物种的种间关联特征

被引：7

作者：

孙园园

刘彤

刘尊驰

郝晓冉

何文琴

朱乐奎

郑波

汤景光

机构：

[1] 石河子大学生命科学学院

来源：

干旱区资源与环境 | 2016年 / 30卷 / 01期

关键词：

古尔班通古特沙漠; 种间关联; 去势对应分析; 看护作用; 种间依赖;

D O I：

暂无

中图分类号：

Q948 [植物生态学和植物地理学];

学科分类号：

071301 [植物生态学];

摘要：

基于古尔班通古特沙漠南缘植物多样性的调查,对22个优势物种间的关联性进行了分析。结果表明:231个种对中,正关联种对数(141对)多于负关联种对(90对),且前者达到显著关联的种对数(89对)也多于后者(27对)。乔灌木对草本植物分布具有显著影响,形成种对中正关联种对数(44对)多于负关联种对(28对),且前者达到显著关联的种对数(22对)也多于后者(10对)。其中白梭梭、白茎绢蒿和淡枝沙拐枣分别与18个优势草本中的11个、13个和13个呈正关联,且多为显著关联;但梭梭与这些草本均不存在显著正关联,表现出明显的生境趋异性。绝大部分(211对)种对的OI<0.6,处于中等偏弱联结强度,表明干旱环境胁迫使部分物种在资源利用趋同同时,而不同物种集团之间发生了空间分布的分离。DCA排序图的种间距离和分布位置在一定程度上印证了上述结果。研究认为本沙漠白梭梭、白茎绢蒿和淡枝沙拐枣等灌木不仅具有防风固沙效应,而且对草本具有重要的看护效应,需要重点保护。在人工植被恢复过程中,应重视不同乔灌木与草本植物间的合理搭配,以构成灌木-草本群落,形成立体防风固沙体系,更好地发挥生态效应。

引用

页码：169 / 174

页数：6

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