Welcome to FETCH3.14’s documentation!#
Overview#
FETCH3.14 is a tree hydrodynamic model for water fluxes across the soil-plant-atmosphere continuum. FETCH3.14 simulates water transport through the soil, roots, and xylem as flow through porous media. The model resolves water potentials along the vertical dimension, and stomatal response is linked to xylem water potential.
There are 2 different transpiration schemes available:
Penman-Monteith transpiration(PM) - Simple transpiration scheme used in Silva et al, 2022. Transpiration is calculated using the Penman-Monteith equation and disctributed through the canopy based on the leaf area density. Stomatal conductance is adjusted using Jarvis functions for incoming shortwave radiation, air temperature, vapor pressure deficit, and xylem water potential.
Non-hydraulically limited transpiration (NHL) - Replicates the more complex canopy transpiration scheme that was used in FETCH2 (Mirfenderesgi et al, 2016). Non-hydraulically limited transpiration is calculated considering stomatal conductance as a function of atmospheric demand and photosynthetic capacity, but without any limitations imposed by soil moisture. The non-hydraulically limited transpiration is then reduced using a function of xylem water potential. This scheme considers the different aerodynamic characteristics at different layers in the canopy, and radiation attenuation through the canopy.
To start using the model, see the Getting Started page!
References#
FETCH3:
Silva, M., Matheny, A. M., Pauwels, V. R. N., Triadis, D., Missik, J. E., Bohrer, G., and Daly, E.: Tree hydrodynamic modelling of the soil–plant–atmosphere continuum using FETCH3, Geosci. Model Dev., 15, 2619–2634, https://doi.org/10.5194/gmd-15-2619-2022, 2022.
FETCH2:
Mirfenderesgi, G., Bohrer, G., Matheny, A. M., Fatichi, S., Frasson, R. P. de M., & Schäfer, K. V. R. (2016). Tree level hydrodynamic approach for resolving aboveground water storage and stomatal conductance and modeling the effects of tree hydraulic strategy. Journal of Geophysical Research: Biogeosciences, 121(7), 1792–1813. https://doi.org/10.1002/2016JG003467
Mirfenderesgi, G., Matheny, A. M., & Bohrer, G. (2019). Hydrodynamic Trait Coordination and Cost-Benefit Trade-offs in Trees. Ecohydrology, 12(1), e2041. https://doi.org/10.1002/eco.2041
FETCH:
Bohrer, G., Mourad, H., Laursen, T. A., Drewry, D., Avissar, R., Poggi, D., et al. (2005). Finite element tree crown hydrodynamics model (FETCH) using porous media flow within branching elements: A new representation of tree hydrodynamics. Water Resources Research, 41(11). https://doi.org/10.1029/2005WR004181