干旱区研究

干旱区研究 ›› 2012, Vol. 29 ›› Issue (1): 64-72.

• 植物生态 • 上一篇    下一篇

绿洲-荒漠过渡带早春自然植被的物种组成及其防风效应

徐满厚,刘彤   

  1. 石河子大学 生命科学学院，新疆  石河子 832000
  • 收稿日期:2010-11-26 修回日期:2011-02-24 出版日期:2012-01-15 发布日期:2012-02-27
  • 通讯作者: 刘彤 .E-mail: liutong1968@yahoo.com.cn
  • 作者简介:徐满厚(1983-)，男，山东临沂人，在读硕士研究生，从事植物生态学研究. E-mail: xumanhou@163.com
  • 基金资助:

    国家“十一五”科技支撑计划 (2007BAC17B03)

Species Composition and Windproof Effect of Natural Vegetation at an Oasisdesert Ecotone in Early Spring

XU Man-hou,LIU Tong   

  1. College of Life Science, Shihezi University, Shihezi 832003, Xinjiang, China
  • Received:2010-11-26 Revised:2011-02-24 Online:2012-01-15 Published:2012-02-27

PDF (PC)

1169

赞

被引次数

21

摘要： 以新疆准噶尔盆地南缘的绿洲-荒漠过渡带为研究区，研究该区早春自然植被的物种组成与分布，并探讨其防风效应。① 过渡带的自然植被以灌木为主，梭梭是优势种。不同样地物种的丰富度指数、多样性指数和均匀度指数差异都较大。② 对自然植被的平均高度、覆盖度、地势起伏度与0.5 m和1.5 m高度的平均风速进行线性相关分析，发现只有地势起伏度与0.5 m和1.5 m高度的平均风速呈极显著正相关关系，且平均风速随植被平均高度和覆盖度的增大有减小的趋势。③ 以Wasson 和 Nanninga 的第一种建模思路为基本模型，构建了自然植被覆盖度与相对风速的数学模型，发现两者存在负指数函数关系，并预测不同风速下，在0.5 m高度，当有效植被覆盖度达到23.16%时，自然植被的防风效能为60%；而在1.5 m高度，当有效植被覆盖度达到36.33%时，自然植被的防风效能为50%。

关键词: 绿洲-荒漠过渡带, 早春, 自然植被, 物种组成, 防风效应, 准噶尔盆地

Abstract: The structure and function of natural vegetation in special habitat of transition zone is different, so an oasis-desert ecotone in southern marginal zone of the Junggar Basin in Xinjiang was selected as our study area. The species composition and distribution of natural vegetation and its windproof effect in this area in early spring were studied. The results are as follows: (1) After analyzing the species composition and distribution of natural vegetation in all the sample plots, it was found that the natural vegetation in the ecotone is dominated by shrubs no matter from the species number or coverage, and Haloxylon ammodendron acts as its construction species. In addition, the indexes of species richness, species diversity and species evenness are quite different from the different regions. (2) After carrying out the linear correlation analysis among the average height and coverage of natural vegetation and its relief amplitude and average wind speed at two heights (0.5 m and 1.5 m) from the ground, it was found that there is only an extremely significant correlation between relief amplitude and average wind speed at two heights, and the average wind speed at two heights is decreased with the increase of average height and coverage of natural vegetation. (3) Based on the Wasson and Nanninga’s first modeling idea, a mathematical model between natural vegetation coverage and relative wind speed was developed using Matlab software, it was found that there is a negative exponential function between them. It was predicted that the windproof effect of natural vegetation can be up to 60% when the coverage of effective vegetation higher than 0.5 m reaches 23.16%; The windproof effect of natural vegetation can reach 50% when the coverage of effective vegetation higher than 1.5 m is 36.33%.

Key words: oasis-desert ecotone, early spring, natural vegetation, species composition, windproof effect, Junggar Basin