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采用统计分析、主成分分析和聚类分析方法,结合GIS技术研究环渤海低平原微咸水区土壤盐渍化特征,并探讨盐分剖面类型和分布状况。结果表明:0～5 cm表层土壤盐分属于强变异强度,5～60 cm各土层盐分属于中等变异强度。土壤盐分变量的全部信息可由盐渍化、碱化、区域地下水埋深和矿化度、K+等5个主成分反映,其累计贡献率达87.88%。土壤盐分剖面分为表聚型、底聚型和中聚型,在环渤海低平原区的面积比例基本一致,约各占1/3。
Using the methods of statistical analysis, principal component analysis and cluster analysis, combined with GIS technology, the salinization characteristics of soil in the Brackish low brackish water area were studied, and the types and distribution of salt profiles were discussed. The results showed that the soil salinity at 0 ~ 5 cm surface belonged to strong variability, and the salinity at 5 ~ 60 cm soil layer belonged to moderate variation intensity. The total information of soil salinity variables can be reflected by the five principal components of salinization, alkalization, regional groundwater depth and salinity, and K +, with the cumulative contribution rate of 87.88%. Soil salinity profile is divided into surface, end and middle polygons, and the area proportion in the low-lying areas around the Bohai Sea is basically the same, accounting for about one third each.