Forest hydrological processes have been extensively studied in temperate, tropical, and semi-arid ecosystems, yet remain understudied in snow-dominated forests. In high-latitude boreal forests and high-altitude Alpine forests, snow interception, snowmelt dynamics, frozen and cold soils, xylem freeze-thaw, and short growing seasons create fundamentally different and complex hydrological conditions. These regions are experiencing amplified warming, with rapid shifts in precipitation seasonality (snow-rain), snow cover, growing season length, and drought frequency, making it urgent to understand the forest hydrological processes in these regions and their responses to climate change.

A persistent challenge in forest hydrology is connecting processes at different spatial scales. Tree-level observations of water use and transport, ecosystem-level measurements of evapotranspiration and other water fluxes, and catchment-level analyses of streamflow and water yield are typically conducted independently, while processes at one scale often depend on those at another. This challenge is compounded in snow-dominated cold environments, where snow tightly couples processes across scales. This session brings together researchers working at and/or across spatial scales in snow-dominated forests.

We welcome contributions on forest-water interactions in snow-dominated cold environments, including:
- Tree level: root water uptake, sap flow dynamics, transpiration regulation, xylem transport and freeze-thaw responses, and stem water storage
- Stand and ecosystem level: evapotranspiration partitioning, canopy interception of snow and rain, forest water balance, and the role of forest structure in snow accumulation and melt
- Catchment level: effects of forest cover and disturbance on streamflow, snowmelt-driven runoff generation, and forest management impacts on water yield
- We particularly encourage studies that bridge two or more scales, e.g., linking tree-level observations to stand or catchment predictions, or using catchment-scale patterns to inform tree-level process understanding.

Contributions based on field observations, experiments, remote sensing, and modelling in boreal or high-mountain forests are welcome. We aim to foster dialogue between field-based researchers and modellers, and between researchers working at different scales, to advance integrated understanding of forest-water interactions in snow-dominated environments under climate change.