FU, Zheng; CIAIS, Philippe; FELDMAN, Andrew; GENTINE, Pierre; MAKOWSKI, David; PRENTICE, I; STOY, Paul; BASTOS, Ana; J.-P., Wigneron

doi:10.1126/sciadv.abq7827

Metadatos

Mostrar el registro completo del ítem

Licencia de uso del documento

http://creativecommons.org/licenses/by-nc/

FU, Zheng
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]

CIAIS, Philippe
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]

FELDMAN, Andrew
NASA Goddard Space Flight Center [GSFC]

Idioma

Article de revue

Este ítem está publicado en

Science Advances. 2022, vol. 8, n° 44, p. eabq7827

American Association for the Advancement of Science (AAAS)

Resumen en inglés

Plant water stress occurs at the point when soil moisture (SM) limits transpiration, defining a critical SM threshold ( crit). Knowledge of the spatial distribution of  crit is crucial for future projections of climate and water resources. Here, we use global eddy covariance observations to quantify  crit and evaporative fraction (EF) regimes. Three canonical variables describe how EF is controlled by SM: the maximum EF (EF max),  crit , and slope (S) between EF and SM. We find systematic differences of these three variables across biomes. Variation in  crit , S, and EF max is mostly explained by soil texture, vapor pressure deficit, and precipitation, respectively, as well as vegetation structure. Dryland ecosystems tend to operate at low  crit and show adaptation to water deficits. The negative relationship between  crit and S indicates that dryland ecosystems minimize  crit 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.< Leer menos

Metadatos

Compartir este ítem

Licencia de uso del documento

Critical soil moisture thresholds of plant water stress in terrestrial ecosystems

Idioma

Este ítem está publicado en

Resumen en inglés

URI

DOI

Orígen

Centros de investigación