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Title
Exploring interactions between soil-plant hydrodynamics and vegetation demography within ELM-FATES
Authors
Jennifer Holm (LBNL), William Riley (Unlicensed) (LBNL), Ryan Knox (LBNL), Daniel Ricciuto (ORNL), Khachik Sargsyan (Sandia)
Abstract
High-latitude forests are known to be vulnerable to permafrost thawing, increased disturbances, and shift in forest cover type to potentially more deciduous as a result of climatic warming. These forest changes can have strong feedbacks to regional and global climate, water and carbon cycling, and carbon sink strengths. For example, soil inundation with thawing can lead to decreases in ecosystem productivity in boreal forests, and strongly influences the vegetation composition via plant competition and survival during wetland expansion, shifting ecosystems into carbon sinks. To be able to accurately predict and model these complex ecological processes we are using a new demographic vegetation model (FATES; Functionally-Assembled Terrestrial Ecosystem Simulator) that is coupled to ELMv1, the land surface model in the global Earth System Model - E3SM. A new continuous soil-root-plant plant hydraulic scheme has been included within FATES, allowing dynamic plant mortality and growth from water stress and changes in subsurface drainage. We use FATES-Hydro to quantify the impacts on water cycling (e.g., water use efficiency, latent heat, soil water storage) and carbon fluxes (NEE) under transitions between boreal evergreen and deciduous trees, and upland and wetland habitats.
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