Characteristics and influencing factors of soil profile salinity in Changji Hui Autonomous Prefecture

doi:10.14088/j.cnki.issn0439-8114.2026.10.011

Abstract

Abstract: Clarifying the differentiation characteristics of salinity in soil profiles and its major influencing factors in Changji Hui Autonomous Prefecture of Xinjiang could provide references for salinization prevention and control as well as soil water-salt regulation in arid oasis areas. Taking Changji Hui Autonomous Prefecture as the study area, based on the field-measured salinity data from five soil layers within 0-100 cm depth at 426 soil profiles in 2024,descriptive statistics, Kruskal-Wallis H test, Dunn-Bonferroni multiple comparison, Spearman correlation analysis and random forest importance ranking were used to analyze the vertical variation of soil salinity and its differences among various land-use types, soil types and geomorphic types. The results showed that the soil salinity at 20-40 cm was relatively low, and the salinity increased with soil depth below 40 cm, presenting a salt accumulation feature in the middle and deep soil layers. The salinity of each soil layer exhibited strong variability. For different land-use types, soil salinity generally followed the order of Gobi desert > grassland > forestland > cultivated land. Among various soil types, desert solonchak, gray-brown desert soil and meadow solonchak had relatively high salt content. In terms of geomorphic types, the platform possessed higher salinity while mountain areas had lower values. Random forest and correlation analyses revealed that elevation ranked first in importance across all five soil layers, with contribution proportions of 13.68%-16.60%, and it was significantly negatively correlated with soil salinity. Hydrothermal factors including precipitation, aridity index, evapotranspiration and soil moisture also made considerable contributions to soil salinity. The profile differentiation of soil salinity in Changji Hui Autonomous Prefecture was jointly affected by topography and geomorphology, hydrothermal conditions, soil genesis background and human activities. Among them, elevation and its characterization of the geomorphic differentiation process were important comprehensive indicators affecting the variation of soil salinity in the 0-100 cm soil layer.

Key words: soil salinity, profile differentiation, random forest, influencing factors, Changji Hui Autonomous Prefecture

CLC Number:

S156.4
TP79

HAN Chen-yang, WANG Peng-fei, FAN Yan-min, LI Yun-hao, ZHAO Jia-hao, Zanurran Wusiman. Characteristics and influencing factors of soil profile salinity in Changji Hui Autonomous Prefecture[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(10): 77-86.

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