油蒿(Artemisia ordosica)退化阶段对灌丛沙堆形态的影响

doi:10.7522/j.issn.1000-694X.2014.00136

摘要/Abstract

摘要：

典型固沙灌木油蒿(Artemisia ordosica)退化过程中如何影响灌丛沙堆的形态特征,仍然未知。在腾格里沙漠东南缘1990年建立的人工固沙植被区,分别对油蒿生殖株、半死株和死株3个阶段灌丛沙堆形态特征进行了调查。结果表明:半死株油蒿灌丛沙堆的高度和体积显著高于死株和生殖株形成的灌丛沙堆,生殖株、半死株和死株灌丛沙堆高度分别为4.8 cm、21.0 cm和12.4 cm,体积分别为0.031 m³、0.159 m³和0.109 m³,坡度分别为3.5°～7.8°、32°～36°和16°～26°。植株特征的改变及所引起的气流变化影响到灌丛沙堆形态特征,不同退化阶段的油蒿显著影响到灌丛沙堆的形成和发育。因此,油蒿灌丛逐渐退化的过程,是灌丛沙堆逐渐演化的过程,也是干旱、半干旱区微地形塑造和景观逐渐变化的过程。

关键词: 油蒿, 灌丛沙堆, 灌丛体积, 退化阶段

Abstract:

The influence of Artemisia ordosica in different degradation stages on morphology of nebkhas remains unknown. A quantitative survey of diameter, height, angle, slope length, area and volume of A.ordosica nebkhas in different degradation stages was carried at a sand-fixed area revegetated in 1990 in the Tengger Desert. The results showed that height and volume of nebkhas formed by semi-dead A.ordosica ramets were significantly higher than those formed by reproductive and dead ramets. The heights of nebkhas formed by reproductive, semi-dead and dead ramets were 4.8 cm, 21.0 cm and 12.4 cm, and the corresponding volumes were 0.031 m³, 0.159 m³ and 0.109 m³ and the slope angles were 3.5-7.8, 32-36 and 16-26, respectively. Change in individual characteristics and subsequent airflow variation affected on morphology of nebkhas, and A.ordosica in different degradation stages played significant impact on formation and growth of nebkhas. Therefore, the evolutive processes of nebkhas, microtopography formation and surface landscape in arid and semi-arid regions were along with change in A.ordosica morphology.

Key words: Artemisia ordosica, nebkhas, volume of plant, degradation stage of plant

中图分类号:

Q145

赵洋, 张志山, 陈永乐, 徐冰鑫, 陈栋. 油蒿(Artemisia ordosica)退化阶段对灌丛沙堆形态的影响[J]. 中国沙漠, 2015, 35(5): 1136-1140.

Zhao Yang, Zhang Zhishan, Chen Yongle, Xu Bingxin, Chen Dong. Effect of Degradation Stage of Artemisia ordosica on Morphology of Nebkhas[J]. JOURNAL OF DESERT RESEARCH, 2015, 35(5): 1136-1140.

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