干扰程度对巴音温都尔沙漠球果白刺沙堆表层沉积物影响的研究

Effects of Disturbance Degree on Sandpile Surface Sediment of Nitraria sphaerocarpa in Bayinwenduer Desert

为了探究不同干扰程度(中度干扰,约1峰骆驼/hm^2;轻度干扰程度,约0.6峰骆驼/hm^2;未干扰,0峰骆驼/hm^2)对巴音温都尔沙漠球果白刺群落灌丛沙堆表层粒径特征的影响,进行了一系列野外取样和室内试验。结果表明:(1)从中度干扰的群落到未干扰的群落,随着干扰程度的降低,球果白刺灌丛的平均粒径在不断增加中(221.3μm、243.7μm、268.1μm)。在不同干扰的群落中,极细砾都分布在球果白刺灌丛沙堆各个方向的底部和灌丛间地。中度干扰的球果白刺灌丛沙堆主要以极细沙为主;轻度干扰的球果白刺灌丛沙堆主要以细沙和极细沙为主;未干扰的球果白刺灌丛沙堆主要以细沙、中沙和极细沙为主。(2)分选性最好的为中度干扰的球果白刺灌丛沙堆,最差的为未干扰的球果白刺灌丛沙堆。3个群落内的球果白刺灌丛沙堆的平均偏度基本都为近于对称,在中度干扰和轻度干扰的群落内,峰态的程度多数为窄的水平;在未干扰的群落内,多数为中等峰度水平。

In order to explore the effects of different disturbance degrees on the soil surface sediment of Nitraria sphaerocarpa in Bayinwenduer Desert(intermedia disturbance, about 1 camel/hm^2;light disturbance, about 0.6 camel/hm^2;natural state plots, 0 camel/hm^2), sampling in field and a lot of experiments have been done. The results show:(1) From moderately disturbed community to undisturbed community, with the decrease of disturbance degree, the average sand grain diameter of Nitraria sphaerocarpa shrubs increased continuously(221.3 μm, 243.7 μm, 268.1μm). In the communities with different disturbances, the very fine gravels are distributed in the middle of two shrub sandpiles. In the moderately disturbed state, the very fine sands are the main component, and the fine sands and the very fine sands are the main component in the light disturbed plots, followed by fine sands, very fine sands and medium sands are mainly distributed in the natural state plots.(2) The best sorting type is the moderately disturbed community, and the worst was undisturbed community. The average skewness of sandpile in the three communities is almost symmetrical. In the moderately and light disturbed communities, the peak degree is mostly narrow, and the peak degree is medium in the natural communities.