Effects of Different Land Use Types and Microgeomorphology on The Spatial Distribution of Soil Salinity in The Upper Reaches of Tarim River
Studying the spatial distribution of soil salt in various land use types and microgeomorphic characteristics holds significant importance for soil salinization control.Taking the irrigated area in the upper reaches of the Tarim River as an instance,the variance of total salt content and base ions of soil in two layers was analyzed through the one-way ANOVA method,and the correlation and principal component analysis of total salt content and base ions of soil under four distinct land use types were investigated.The findings demonstrated that soil total salt content exhibited strong vari-ability across different land use types.The overall total salt content in the upper soil was:Other land＞Forest land＞Cul-tivated land＞Garden land,and the overall total salt content in the lower soil was:Other land＞Cultivated land＞Forest land＞Garden land.In the soil of different land use types,the correlation between Cl-,SO42-,Ca2+,Mg2+,and K++Na+was favorable,yet the correlation between the salt ions and HCO3-was weak.The highest ionic correlations were Cl-and K++Na+in Cultivated land,Forest land,and Other land,followed by SO4-and Ca2+.The principal component analysis of soil salt ions under different land use types in this region indicated that Cl-,SO42-,Ca2+,Mg2+,and K++Na+were the first princi-pal components,which mainly represented soil salinization information,while HCO3-was the second and third principal components,which mainly represented soil alkaline information.The interaction between land use type and microgeo-morphic features could effectively explain the spatial distribution of soil salt and reflect the alterations of soil salt and salt ions in this area,with q values ranging from 0.4146 to 0.6018,followed by elevation and slope direction,with q val-ues ranging from 0.270 to 0.454,which could well explain the spatial distribution of soil salt in this region.
Land use typeMicro-geomorphologySoil total salt contentPrincipal componentInteraction
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