毛乌素沙地南缘3种灌草丛形态与阻沙能力的对比研究

Comparison on Morphology and Sand Trapping Capability of Three Shrubs in South Edge of Mu Us Sandland

灌草丛形态对其沙丘形态塑造具有重要作用。通过对毛乌素沙地南缘典型灌草丛沙堆形态参数的测量,定量分析了针茅、沙蒿、沙柳3种主要灌草丛形态对其沙堆形态的影响,并探讨了不同灌草丛的阻沙能力。对灌草丛及沙堆形态参数之间的相关分析表明,3种灌草丛沙堆的长度、宽度与灌草丛的冠幅长度、宽度存在显著相关;沙堆高度与灌草丛高度微相关、与冠层高度不存在明显相关关系;沙堆水平分量与灌草丛高度也存在较强相关关系,相关性强弱依次为针茅、沙柳、沙蒿;沙堆体积与灌草丛体积相关性显著,相关性强弱依次为针茅、沙柳、沙蒿;研究结果证明,阻沙能力沙蒿最强,其次为针茅、沙柳。

Plant morphology is important for shaping sand dune morphology. Based on the measurement of typical plants and dune morphology in the Mu Us Sandland, the paper quantificationally analyzes three kinds of plants, and then discusses their sand trapping capability. Correlative analysis of primary parameters shows that,the length and width of plants correspond with length and width of dunes apparently;dune height is slightly correlated to plant height, but there is no correlation between dune height and plant crown height ; component L and plant height H have correlation,but the correlation coefficient from high to low is that Stipa plareosa ,Salix psammophila ,Artemisia spherocephala ;the dune volume is strongly correlated to the plant volume,but the correlation coefficient from high to low is that Stipa plareosa ,Salix psammophila ,Artemisia spherocephala. The results prove that the capability of sand trapping is that Artemisia spherocephala is higher than Stipa plareosa, Stipa plareosa is higher than Salix psammophila.