科尔沁沙地沙丘迎风坡面干沙层的空间分布  

Spatial distribution patterns of dry sand layer on windward slope of dunes in Horqin Sand Land

作　　者：宗芹[1,2] 阿拉木萨[1] 骆永明[1] 牛存洋 陈雪峰[3] 汪海洋 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100049 [3]内蒙自治区翁牛特旗林业局,内蒙古自治区翁牛特旗024500

出　　处：《应用生态学报》2012年第4期875-880,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30671723,40971167)资助

摘　　要：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%.An observation was conducted on the thickness of dry sand layer on the windward slope of mobile and fixed dunes in west Horqin Sand Land,with the spatial distribution of the dry sand layer analyzed.Most of the dry sand layer had a thickness of 5-15 cm,and 92.0% and 98.6% of the mobile and fixed dunes had the dry sand layer with this thickness,respectively.Sand-fixing plants affected the thickness and the spatial distribution of the dry sand layer.There was an obvious spatial difference in the thickness of the dry sand layer on mobile dunes,being much thicker in the upper west areas while much thinner in the lower east areas.The thickness of the dry sand layer varied from 0 to 40 cm,with an average of 9.58±3.95 cm,and the CV was 41%.The variogram of the spatial distribution of dry sand layer on mobile dunes was expressed as spherical model,with a moderate spatial correlation.In contrast,the thickness of dry sand layer on fixed dunes showed obvious homogeneity,and had less spatial difference.The thickness of the dry sand layer ranged from 0 to 20 cm,with an average of 10.91±1.70 cm,and the CV was only 16%.

关 键 词：流动沙丘 固定沙丘 干沙层 空间格局 

分 类 号：S152.7[农业科学—土壤学]