The characteristics of soil salinization in typical field of the Yellow River Delta was studied by the application of principle component analysis and hierarchical cluster analysis, and the classification of soil salinity profile types in our study area was also explored. The results showed that soil salinity was overall high and salt accumulation at the surface soil layer was generally significant, and soil salinity exhibited strong variation in both vertical and horizontal orientations. Soil salinity could be reflected by four principle components that were soil salt content, ion components, alkalization characteristics and exterior factors, and the cumulative contribution of these principle components added up to 86.21%. Hierarchical cluster analysis results indicated that salinity profile types could be obviously classified into inverted, normal and even, and the predominant salinity profile types in our study area were inverted and normal. The inverted salinity profiles mostly distributed in the east and north of the study area, while the normal salinity profiles mainly located in the west and northwest. The distribution patterns of salinity profile types reflected the vegetation types and land use patterns to some extent, and human agricultural activity was the crucial reason for the formation of normal and even salinity profile types. The research results can serve as a theoretical and practical reference to the partition, amelioration, management and rational utilization of saline soils in the Yellow River Delta.
Journal of Arid Land Resources and Environment
Yellow River Delta
salinity profile types
principle component analysis
Hierarchical cluster analysis