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运用经典统计学和地统计学相结合的方法,于2012年6月研究了上海市崇明东滩滨海盐土上3种人工植被表层土壤(0～20cm)水盐的空间异质性.结果表明:不同样地的土壤含水量大小顺序为:落羽杉林>狗牙根草丛>夹竹桃灌丛,其变异系数分别为13.9%、13.4%和12.9%;土壤电导率为:夹竹桃灌丛>落羽杉林>狗牙根草丛,其变异系数分别为79.2%、55.4%和15.9%;二者均属中等程度变异.不同样地土壤水盐的理论变异模型各不相同,其中土壤电导率的拟合效果更好,R2在0.97～0.99.当植被从夹竹桃灌丛→狗牙根草丛→落羽杉林,土壤含水量的空间异质性程度由弱变强,其中夹竹桃的变异性是随机的;植被从狗牙根草丛→夹竹桃灌丛→落羽杉林,土壤电导率的空间异质性由中等相关变为强相关.不同植被下土壤电导率空间自相关性多为正相关,土壤水分多呈负相关.狗牙根草丛的土壤水盐均呈条带状分布,落羽杉林地土壤水盐均呈大斑块连续状分布,而夹竹桃灌丛的土壤水分呈小斑块破碎状分布,盐分呈条带状分布.
Using the combination of classical statistics and geo-statistics, the spatial heterogeneity of water and salt content in the topsoil (0 ~ 20cm) of three kinds of artificial vegetation in coastal beach of Chongming Island in Shanghai was studied in June 2012. The results showed that: The order of soil water content in different plots was: Taxodium distichum> Bermudagrass> Apricot shrub with variation coefficients of 13.9%, 13.4% and 12.9%, respectively. Soil conductivity was as follows: oleander shrub> Cunninghamia lanceolata and Bermudagrass grassland, their coefficient of variation were 79.2%, 55.4% and 15.9%, respectively, and both of them were moderate variations.The theoretical models of soil water and salt variation in different plots were different, and the fitting effect of soil electrical conductivity R2 was 0.97 ~ 0.99. The spatial variability of soil water content changed from weak to strong when the vegetation ranged from oleander shrub to bermudagrass and Taxodium distichum forest, and the variability of oleander was random. Vegetation changes from medium to strong correlations of spatial heterogeneity of soil conductivity from bermudagrass → oleander shrubs → Taxodium distichum.The spatial autocorrelation of soil electrical conductivity under different vegetations is mostly positive and the soil moisture is mostly Negative correlation. Bermudagrass soil water and salt were strip Cloth, soil water Bald Fir salt showed a continuous distribution of large plaques, and soil moisture were oleander shrub distribution of small patches crushed, salt was banded.