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对科尔沁沙地西部地区流动沙丘和固定沙丘的迎风坡表层干沙层厚度进行观测,分析了沙丘坡面干沙层的空间分布特点.结果表明:研究区沙丘迎风坡表层干沙层厚度主要在5～15cm,92.0%的流动沙丘区域和98.6%的固定沙丘区域的干沙层厚度分布在此范围内;固沙植物影响沙丘表层干沙层的厚度变化和空间分布.流动沙丘表层干沙层厚度表现出明显的空间差异性:迎风坡上部西侧区域干沙层厚度较大,下部东侧区域相对较薄,其平均厚度为(9.58±3.95)cm,干沙层厚度在0～40cm范围内变化,变异系数为41%,干沙层空间分布的变异函数表现为球状模型,具有中等的空间相关性;固定沙丘的干沙层厚度表现为明显的均一性,空间差异性不明显,其平均厚度为(10.91±1.70)cm,干沙层厚度变化范围在0～20cm,变异系数仅16%.
The dry sand layer thickness on the windward slope of the moving sand dune and the fixed sand dune in the west of Horqin sandy land was observed and the spatial distribution characteristics of the dry sand layer on the sand dune slope were analyzed.The results show that the thickness of the dry sand layer on the windward slope of the sand dune mainly lies in The distribution of dry sand thickness in 5 ~ 15cm, 92.0% of the mobile dune area and 98.6% of the fixed sand dune area were within this range. Sand-fixing plants affected the thickness variation and spatial distribution of dry sand layer in the sand dune surface. Showing the obvious spatial difference: the dry sand layer is thick on the west side of the upper windward slope, the area on the east side of the lower part is relatively thin, the average thickness is (9.58 ± 3.95) cm, the dry sand layer’s thickness is in the range of 0-40 cm The coefficient of variation (CV) was 41%. The variation function of spatial distribution of dry sand showed spherical model with moderate spatial correlation. The dry sand thickness of fixed sand dunes showed obvious homogeneity with no obvious spatial difference. The average The thickness is (10.91 ± 1.70) cm, the thickness of dry sand layer varies from 0 to 20 cm, and the coefficient of variation is only 16%.