Abstract:Snow accumulation is a critical factor influencing spring soil water dynamics in grassland ecosystems, with snow mass primarily affected by snowfall and redistribution processes. Nevertheless, there exists a paucity of research investigating the potential impacts of grazing on snow accumulation and subsequent soil water content during the spring thaw period. This study aims to elucidate the effects and underlying mechanisms of various grazing intensities on snow accumulation and the soil water content following snowmelt in spring in a representative grassland ecosystem. By doing so, it seeks to provide a scientific foundation for the rational utilization and optimal management of grasslands. Utilizing a long-term controlled grazing experimental setup established in the Xilingol grasslands, we quantified vegetation characteristics, snow accumulation, and soil water content under five grazing intensities, including ungrazed (G0), lightly grazed (G0.75), moderately grazed (G1.50), heavily grazed (G2.25), and extremely heavy grazed (G3.00) during 2016 and 2017. The results revealed a gradual reduction in snow mass with the increasing grazing intensity, with an average snow mass in 2016 being 57.63% higher compared to 2017. Specifically, extremely heavy grazing led to a substantial decrease in snow mass by 75.20% and 74.53% in 2016 and 2017, respectively, when compared to the ungrazed treatment. Soil water content tended to decrease gradually in the spring as grazing intensity increased. In the ungrazed treatment, spring soil water content (0-40 cm) measured 14.91% and 10.70% in 2016 and 2017, respectively, representing 1.5 and 1.4 times higher values than those observed in the extremely heavily grazed treatment. Our analysis indicated significant positive correlation between soil water content and vegetation characteristics (aboveground biomass and plant height), as well as snow accumulation metrics (snow mass and snow depth). The top soil layer (0-5 cm) water exhibited greater sensitivity to grazing compared to deeper soil layers. The results of structural equation modeling showed that snowfall, vegetation characteristics and snow accumulation had significant positive effect on spring soil water. Grazing activities exerted a detrimental effect on snow mass and spring soil water content by depleting vegetation cover. Hence, to obtain increased amounts of snow accumulation and spring soil water, land managers should consider to mitigate the grazing intensity or implementing ungrazed plots as management strategies.