@article{Fu:2022:10.1126/sciadv.abq7827,
author = {Fu, Z and Ciais, P and Feldman, A and Gentine, P and Makowski, D and Prentice, IC and Stoy, PC and Bastos, A and Wigneron, J-P},
doi = {10.1126/sciadv.abq7827},
journal = {Science Advances},
pages = {1--12},
title = {Critical soil moisture thresholds of plant water stress in terrestrial cosystems},
url = {http://dx.doi.org/10.1126/sciadv.abq7827},
volume = {8},
year = {2022}
}

Download

TY  - JOUR
AB  - Plant water stress occurs at the point when soil moisture (SM) limits transpiration, defining a critical SM threshold (θcrit). Knowledge of the spatial distribution of θcrit is crucial for future projections of climate and water resources. Here, we use global eddy-covariance observations to quantify θcrit and evaporative fraction (EF) regimes. Three canonical variables describe how EF is controlled by SM: the maximum EF (EFmax), θcrit, and slope (S) between EF and SM. We find systematic differences of these three variables across biomes. Variation in θcrit, S, and EFmax is mostly explained by soil texture, vapor pressure deficit and precipitation, respectively, as well as vegetation structure. Dryland ecosystems tend to operate at low θcrit and show adaptation to water deficits. The negative relationship between θcrit and S indicates that dryland ecosystems minimize θcrit through mechanisms of sustained SM extraction and transport by xylem. Our results further suggest an optimal adaptation of local EF–SM response, that maximizes growing-season evapotranspiration and photosynthesis.
AU  - Fu,Z
AU  - Ciais,P
AU  - Feldman,A
AU  - Gentine,P
AU  - Makowski,D
AU  - Prentice,IC
AU  - Stoy,PC
AU  - Bastos,A
AU  - Wigneron,J-P
DO  - 10.1126/sciadv.abq7827
EP  - 12
PY  - 2022///
SN  - 2375-2548
SP  - 1
TI  - Critical soil moisture thresholds of plant water stress in terrestrial cosystems
T2  - Science Advances
UR  - http://dx.doi.org/10.1126/sciadv.abq7827
UR  - https://www.science.org/doi/10.1126/sciadv.abq7827
UR  - http://hdl.handle.net/10044/1/99879
VL  - 8
ER  - 

Download