Multidimensional Spatial Characteristics and Risk Assessment of Soil Salinization in the Old Yellow River Basin
[Objective]This study aimed to grasp the multidimensional spatial distribution characteristics of soil salinization,analyze the factors influencing salinization risk,implement risk area zoning control and improve the efficiency of saline land use.[Method]In this study,the Yellow River old riverway in Hekou District,Dongying City,Shandong Province,was selected as the study area.Descriptive statistics on soil salinization status were conducted using classical statistical methods,the two-dimensional spatial distribution pattern of salinization in the study area was analyzed based on GIS interpolation,the three-dimensional spatial distribution of salinity and its change trends were visualized using GMS three-dimensional inverse distance weight interpolation,and a soil salinization risk evaluation model was constructed to quantitatively analyze the risk.[Result]The results show that the average salinity of the soil in the study area was 5.84 g·kg-1,representing severe salinization;and the average pH value was 7.82,indicating weakly alkaline.In two-dimensional space,the areas with high salinity(≥ 6 g·kg-1)were mainly located in the north of the study area,and the overall trend was decreasing from the coast to the inland.In three-dimensional space,the distribution characteristics of the soil salinity profile were mainly homogeneous,with local surface aggregation and clustering at both ends,showing a complex coexistence of three types:surface aggregation,homogeneous,and clustering at both ends.The risk degree of salinization was divided into four levels and the extremely high-risk areas were mainly distributed in the north-central and northeast of the study area.Also,high-risk areas were mainly distributed in the middle and northeast,moderate-risk areas in the west and southeast,and low-risk areas in the southwest of the study area.[Conclusion]We recommend that the following measures should be employed to minimize the risk of salinization and improve the efficiency of resource utilization:preventive measures in extremely high-risk areas,control measures in high-risk areas,and improvement measures in moderate and low-risk areas.
Soil salinizationSpatial characteristicsMultidimensional analysisRisk assessmentThe Yellow River old riverway
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