Ecohydrology of Snow-Influenced Forest Systems

The ecohydrology of snow-influenced forest systems examines the complex interplay between winter precipitation, forest vegetation and the hydrological cycle in regions where seasonal snow persistently interacts with woodland canopies. Forest cover alters snow accumulation through processes such as canopy interception and wind redistribution, while sub-canopy energy exchanges—driven by radiation, turbulent fluxes and longwave emission—govern snow metamorphism and ablation. These interactions determine the timing and magnitude of snowmelt contributions to soil moisture, streamflow and groundwater recharge. Climate warming and disturbance events, notably wildfires and insect outbreaks, modify canopy structure and snow albedo, leading to shifts in melt patterns and water availability. Advances in high-resolution remote sensing, field campaigns and process-based modelling have improved quantification of forest snow dynamics, yet challenges remain in scaling from tree-scale processes to catchment-wide predictions. Understanding these dynamics is critical for managing water resources and maintaining ecosystem resilience in mountainous and boreal regions under changing climatic and disturbance regimes.

Research from Nature Portfolio

Recent studies of post-fire landscapes have revealed that forest fires significantly increase solar forcing on snow by enhancing canopy transmissivity and depositing light-absorbing impurities on the snow surface. These changes have accelerated melt rates and advanced snow disappearance by several days, with radiative forcing on charred snowpacks increasing nearly four-fold over the last two decades. Separately, foundational work on mountain hydrology has elucidated the mechanisms by which drought and temperature anomalies modulate water availability. Key processes include first-access evapotranspiration of precipitation, warming-driven increases in evapotranspiration, and compensating effects of spatial heterogeneity, dieback and disturbance-driven reductions in canopy density. Together, these studies clarify how biophysical controls and disturbance legacies interact to shape the ecohydrological response of snow-dominated forest catchments.

Ecohydrology of Snow-Influenced Forest Systems publication trend

The graph below shows the total number of articles in ecohydrology of snow-influenced forest systems across all publications each year (not limited to Nature Index journals).

Technical terms

Canopy interception: The capture of snowfall by foliage and branches before it reaches the ground.

Ablation: The melting and sublimation processes that remove snowpack mass.

Snow albedo: The fraction of solar radiation reflected by the snow surface, influenced by impurities and grain size.

Snow water equivalent (SWE): The depth of liquid water contained within a snowpack if melted.

Energy balance model: A representation of radiative, conductive and turbulent exchanges governing snowpack evolution.

Lidar: A remote-sensing technique using laser pulses to measure canopy and terrain structure in three dimensions.

References

1. Snow accumulation and ablation measurements in a midlatitude mountain coniferous forest (Col de Porte, France, 1325 m altitude): the Snow Under Forest (SnoUF) field campaign data set. Earth System Science Data (2023).
2. Canopy structure, topography, and weather are equally important drivers of small-scale snow cover dynamics in sub-alpine forests. Hydrology and Earth System Sciences (2023).
3. Using just a canopy height model to obtain lidar-level accuracy in 3D forest canopy shortwave transmissivity estimates. Agricultural and Forest Meteorology (2023).
4. Four-fold increase in solar forcing on snow in western U.S. burned forests since 1999. Nature Communications (2019).
5. Mechanisms controlling the impact of multi-year drought on mountain hydrology. Scientific Reports (2018).