阿拉善高原荒漠植被组成分布特征及其环境解释:Ⅱ. C4植物组成、分布特征与环境的关系

摘要/Abstract

摘要： 研究了阿拉善典型干旱荒漠植被区C4植物的组成特征、空间分布及其与环境因子的相关性。发现C4植物主要集中在藜科(Chenopodiaceae)和禾本科（Gramineae）,生活型以一、二年生草本为主,占到70％以上;旱生和旱中生C4植物所占比例较大,达到48.89％,其区系成分以世界成分、亚洲中部成分和古地中海成分为主。C4植物分布特征表现出不同的规律性:在垂直地带分布上与温度呈正相关关系、与降雨呈负相关关系;在水平经度地带分布上主要与降水呈正相关关系,与温度无显著相关,尤其是在极端高温、干旱（主要是额济纳戈壁荒漠区）地区,C4植物的生存受到了限制。这一结果对于揭示阿拉善地区C4植物的水分利用效率,及其与降水资源的空间分布之间的关系提供了一定的理论解释。

关键词: 光合作用途径, 水分利用效率, 生活型, 生态型

Abstract: C4 plants of Alxa desert are principally manifested by Chenopodiaceae, Gramineae, and the life forms are most biennial and annual grasses, accounting for more than 70%; xerophytic and mesophytic C4 plants make up 48.89%, and whose floristic area-types are mainly from Cosmopolitan, Asia media and Tethys. Distribution of C4 plants presents different laws in Alxa region: distribution of C4 plants positively relates to temperature and negatively relates to precipitation along altitudinal zonality; it positively relates to precipitation and less relates to temperature along horizontal zone, especially, presence of C4 plants are limited in extremely high temperature and arid conditions (mainly in gobi desert area of Ejin Banner). The results can some explain the status of the water utilization efficiency of C4 plants in Alxa and its relationship with spatial precipitation distribution.

Key words: Photosysnthetic pathway, Water use efficiency(WUE), life form, Ecotype

中图分类号:

Q948.15

何明珠;张志山;李小军;贾荣亮;张景光;郑敬刚. 阿拉善高原荒漠植被组成分布特征及其环境解释:Ⅱ. C4植物组成、分布特征与环境的关系[J]. 中国沙漠, 2010, 30(1): 57-62.

HE Ming-zhu;ZHANG Zhi-shan;LI Xiao-jun;JIA Rong-liang;ZHANG Jing-guang;ZHENG Jing-gang. Environmental Effects on Distribution and Composition of Desert Vegetations in Alxa Plateau:Ⅱ.Correlation between C4 plants distribution and environmental factors[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(1): 57-62.

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