基于敦煌西湖荒漠湿地生态系统植被与土壤特性调查，采用地统计学方法，研究了敦煌西湖荒漠湿地生态系统的土壤水分和植被的空间变异特征．结果表明：研究区植被盖度、高度和多度的平均值分别为36．14％、80．42 cm和0．66株·m2，变异系数依次为117．52％、124．63％和36．50％，植被盖度和高度均为高度变异，植被多度为中等变异；0～200 cm土层各层土壤湿度平均值为14．873％，介于6．681％～23．004％，变异系数介于39．28％～88．65％．200 cm 土层水分贮量平均值为163．598 mm，变异系数为36．51％，0～200 cm土层各层土壤湿度和2 m土层水分贮量均为中等变异．植被特征与土壤特性各要素的基台值（C0＋C）介于0．112～0．549，结构比介于76．6％～97．6％，各变量具有较强的空间自相关性．研究区植被型组由盐池湾向南呈沼泽→盐沼→草甸→阔叶林→荒漠演变过程，植被特征与土壤特性在样带空间分布上具有明显的规律性，且存在较强的空间自相关性和格局．
Spatial heterogeneity of vegetation and soil moisture in the desert-wetland ecosystem in Dunhuang Xihu,Gansu Province,China
Based on the investigation of vegetation and soil properties,the spatial heterogeneity of vegetation and soil moisture in Dunhuang Xihu desert-wetland ecosystem were studied with geostatistics.The results showed that the vegetation coverage,height and density were 36.14%,80.42 cm and 0.66 plant·m-2;the variation coeffi-cient of vegetation coverage and height were 1 17.52%,124.63%,characterized with highly divergent,but the variation coefficient of vegetation density was 36.50%,characterized with medium divergent;the soil moisture from 0 to 200 cm depth ranged from 6.681% to 23.004%,and the variation coefficient was between 39.28%and 88.65%;the moisture stored in the 200 cm soil was 163.598 mm on average,with a variation coefficient of 36 .5 1%.Thus,the soil moisture from 0 to 200 cm depth and the moisture stored in the soil of 200 cm both were characterized with medium divergent;sill (C0 +C)of vegetation characteristics and soil properties varied from 0.1 12 to 0.549,with texture ratio between 0.766% and 0.976% and high spatial autocorrelation of all varia-bles;the succession of vegetation type group showed a regularity as swamp→saline marsh→meadow→broad-leaved forest→desert southwards from Yanchiwan,also the vegetation characteristics and soil properties presented obvious spatial regularity and high spatial autocorrelation.
NETL
NSTL
万方数据
维普
