【摘要】 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·m-2,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.更多还原

【Abstract】 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 coefficient of vegetation coverage and height were 117. 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 of36. 51%. 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 from0. 112 to 0. 549,with texture ratio between 0. 766% and 0. 976% and high spatial autocorrelation of all variables; the succession of vegetation type group showed a regularity as swamp → saline marsh → meadow→ broadleaved forest→desert southwards from Yanchiwan,also the vegetation characteristics and soil properties presented obvious spatial regularity and high spatial autocorrelation.更多还原