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Journal of Desert Research ›› 2026, Vol. 46 ›› Issue (2): 177-187.DOI: 10.7522/j.issn.1000-694X.2025.00156

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Composition of soluble salts in sedimentary strata of the Hunshandake Sandy Land and its influencing factors

Xiaozong Ren1(), Xiaoping Yang2   

  1. 1.School of Geography Science / Shanxi Key Laboratory of Earth Surface Processes and Resource Ecological Security in Fenhe River Basin,Taiyuan Normal University,Jinzhong 030619,Shanxi,China
    2.School of Earth Sciences,Zhejiang University,Hangzhou 310027,China
  • Received:2025-08-25 Revised:2025-10-09 Online:2026-03-20 Published:2026-04-13

Abstract:

The soluble salts commonly found in desert/sandy land affect the salt cycle in regions and even globally. The formation of soluble salts in surface sediments is often considered related to climate, while there is much controversy over the factors that contribute to the formation of soluble salts in sub-surface sediments. Soluble salts extracted from two Holocene sections, Saihanxili (SX) and Bayan Nur (BN), in the Hunshandake Sandy Land, were sampled. The synthetic parameters, hydrochemical types, and major ion contents of the extraction solution were analyzed. The results showed that except for a few samples, the TDS (Total Dissolved Solids) of the soluble salt extract from SX and BN sections was low, and the pH was neutral to slightly alkaline. Additionally, the average values of TDS from aeolian sand, paleosol, and light-colored aeolian sand in the surface layers of the SX section were higher than those in the BN section, while the average values of pH from all layers except the surface aeolian sand layer were lower. The average TDS and pH of the soluble salt extract from the surface layer of aeolian sand in SX section were higher than those in BN section. An analysis of the types and quantities of soluble salts in the surface aeolian sand layer of the SX and BN sections showed that, unlike the dominant ions Cl- and Na+ in western deserts of China, the SX and BN sections from relatively humid areas exhibited HCO3- and Ca2+ as the primary ions. The soluble salt content in these sections was similar to that in western deserts of China, closely correlated with the aridity index and primarily controlled by modern climate, while also influenced by regional environmental factors such as sediment sources. The soluble salts in paleosol and its lower layer sediment are significantly influenced by the ancient environment and climate, resulting in leaching and CaCO3 deposition corresponding to the humid climate at that time. Water chemical processes such as ion exchange and simple dissolution/linear mixing also affect the distribution of soluble salts in the sections. In addition, biological and human activities affect the distribution of soluble salts in sediments through various means.

Key words: Hunshandake Sandy Land, sedimentary strata, soluble salts, hydrochemistry, influencing factors

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