What the study found
Freeze–thaw conditions changed how water, heat, and salt moved through saline farmland soil. Air temperature and snow cover were linked to vertical differences in heat and mass transfer, and the study identified different behavior in shallow and deeper soil layers.
Why the authors say this matters
The authors conclude that the findings provide a reference for parameterized characterization and quantitative assessment of water–salt processes in comparable saline soils. The study also suggests the mechanisms behind moisture recovery and salt redistribution can be clarified under natural freeze–thaw conditions.
What the researchers tested
The researchers studied a representative saline farmland in northern China using hourly in-situ monitoring together with laboratory freeze–thaw experiments. They identified key periods and quantified the spatiotemporal evolution of coupled water–heat–salt dynamics and related parameter responses.
What worked and what didn't
Frozen soil and snow increased shallow soil water content by 32.20% relative to early winter. Snowmelt infiltration reduced salt content by 15.44–34.02%, while permeability dropped strongly during freezing and then exceeded pre-freeze levels after thawing, which facilitated infiltration and downward salt leaching. Thermal conductivity increased by 20.76–56.78%, and volumetric heat capacity decreased by 22.30–39.41%, so cooling proceeded faster than warming.
What to keep in mind
The abstract does not describe specific limitations beyond the study being conducted in one representative saline farmland and in laboratory freeze–thaw experiments. The reported findings are therefore presented within the context of the site and conditions studied.
Key points
- Freeze–thaw conditions reshaped water, heat, and salt behavior in saline farmland soil.
- Snow cover and air temperature jointly affected vertical heat and mass transfer.
- Shallow soil water content increased by 32.20% relative to early winter.
- Snowmelt infiltration reduced salt content by 15.44–34.02%.
- Permeability fell sharply during freezing and rose above pre-freeze levels after thawing.
- Soil temperature gradient and matrix potential gradient were identified as the main drivers of water–salt migration.
Disclosure
- Research title:
- Freeze-thaw changes water, heat, and salt movement in saline farmland soils
- Authors:
- Dongmei Ruan, Jianmin Bian, Yu Wang, Zhiqi Gu
- Institutions:
- Jilin University, Jilin University, Jilin University, Jilin University
- Publication date:
- 2026-02-21
- OpenAlex record:
- View
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