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为揭示风沙区柠条灌丛沙堆的发育规律,并为灌丛沙堆的发育阶段划分提供参考,对大、中、小三种柠条(Caragana korshinskii)灌丛沙堆顶部、中部和底部的土壤颗粒组成及分形维数、土壤有机碳特征进行研究。结果表明:土壤有机碳含量随灌丛沙堆的增大而递减,与灌丛及其沙堆的外部形态特征呈显著性负相关;随灌丛沙堆的增大,细砂含量逐渐增加,粉粒的含量逐渐减少;土壤粒径分形维数随灌丛沙堆的增大而递减,其与土壤黏粒、粉粒呈显著性正相关,与细砂、极细砂的百分含量呈负相关;土壤有机碳含量与土壤粒径分形维数之间存在显著性正相关。灌丛沙堆具有明显的空间异质性,沙堆上的土壤有机碳含量与土壤的颗粒组成与沙堆大小具有一定的相关性,并可作为划分沙堆发育阶段的标准,但需要充分考虑风力、植物和沙源等因素的影响。
In order to reveal the law of the development of the Caragana korshinskii shrub sand heap in the windy and sandy areas and to provide reference for the developmental stages of the shrub sand heap, Soil particle composition and fractal dimension, soil organic carbon characteristics were studied. The results showed that the content of soil organic carbon decreased with the increase of shrubs, but negatively correlated with the external morphology of shrubs and sand banks. With the increase of shrubs, the content of fine sand increased gradually, The content of powder particles decreased gradually. The fractal dimension of soil particle size decreased with the increase of shrub sand mass. The fractal dimension of soil particle size had a significant positive correlation with clay and grain size, and the percentage of fine particle sand and fine sand There was a significant positive correlation between soil organic carbon content and fractal dimension of soil particle size. The shrubbery has obvious spatial heterogeneity. The soil organic carbon content on the sandpile and the particle composition of the soil have a certain correlation with the size of the sand pile, and can be used as the standard to divide the development phase of the sand pile, however, it needs to fully consider Wind, plants and sand and other factors.