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B08. Plant Hydraulics Effect

B08. Plant Hydraulics Effect

Nov 20, 2019

 

 

Poster Title

Plant hydraulics on response of soil water and ET to environmental conditions

First Author

@Yilin Fang

Topic

Water Cycle

Affiliation

E3SM Water Cycle

Link to document

 

Title

Plant hydraulics on response of soil water and ET to environmental conditions

Authors

Yilin Fang and Ruby Leung

Pacific Northwest National Laboratory

Abstract

A simple plant hydraulics model assuming steady state condition and ignoring plant tissue water storage has been implemented in ELM.  One degree global simulation using GPCC atmospheric forcing shows that there is a good correlation between the simulated and MOD16 ET in America and Europe in the drought year of 2002 and 2003, respectively.  However, simulated ET in Amazon exhibits narrower range compared to MOD16 ET, thus lower correlation.  In general, ET simulated with default plant hydraulics (PHS) parameters is higher than that without PHS.  PHS parameters can be tuned to match the observation, but they could be spatially and PFT dependent.  The difference in ET between the models with and without PHS are not significant when ambient CO2 is doubled, but both models simulate decreased ET compared to the control run.