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中国沙漠  2015 

油蒿(Artemisiaordosica)退化阶段对灌丛沙堆形态的影响

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

Keywords: 油蒿,灌丛沙堆,灌丛体积,退化阶段

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Abstract:

典型固沙灌木油蒿(Artemisiaordosica)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4.8cm、21.0cm和12.4cm,体积分别为0.031m3、0.159m3和0.109m3,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。

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