Influence of Soil Salinization on Active Layer Thickness of Frozen Soil

The climate of the Qinghai–Tibet Plateau is distinct. Given large temperature difference between day and night, drought in perennial years, low rainfall evaporation volume, frozen soil some areas will occur salt. presence salt changes water thermal characteristics soil, which affect its activity layer. In this paper, Beiluhe area was selected as research object, numerical calculation model water, heat salinised established. Considering influence crystallisation on freezing active layer, effects different concentrations, contents type thickness layer were compared analysed. Therefore, degenerates under action sodium chloride sulphate, sulphate not conducive to stability for many years. During salinisation, content increases; permafrost initially decreases then initial time postponed cooling stages, when with a concentration 0.2–0.8% delayed by 21, 32, 54 65 days; decreases, opposite thawing heating increases increase concentration. finally contrary warm season. (with maximum 0.82 m) has little effect High permafrost. When constant, change smaller; season lower; smaller, tends be more stable. generally reduces warm-season (−6 m 30% 40% −6 0.17 °C 0.24 lower than that 20% content). However, analysis containing must combine temperature.