Atmospheric dryness reduces photosynthesis along a large range of soil water deficits
Centre National de la Recherche Scientifique · Université de Versailles Saint-Quentin-en-Yvelines · +16 more institutions
Abstract
Both low soil water content (SWC) and high atmospheric dryness (vapor pressure deficit, VPD) can negatively affect terrestrial gross primary production (GPP). The sensitivity of GPP to soil versus atmospheric dryness is difficult to disentangle, however, because of their covariation. Using global eddy-covariance observations, here we show that a decrease in SWC is not universally associated with GPP reduction. GPP increases in response to decreasing SWC when SWC is high and decreases only when SWC is below a threshold. By contrast, the sensitivity of GPP to an increase of VPD is always negative across the full SWC range. We further find canopy conductance decreases with increasing VPD (irrespective of SWC),…
Citation impact
- FWCI
- 37.02
- Percentile
- 100%
- References
- 64
Authors
11- ZFZheng FuCorresponding
Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Laboratoire des Sciences du Climat et de l'Environnement, CEA Paris-Saclay
- PCPhilippe Ciais
Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Laboratoire des Sciences du Climat et de l'Environnement, CEA Paris-Saclay
- ICI. Colin Prentice
Imperial College London, Macquarie University, Tsinghua University
- PGPierre Gentine
Columbia University
- DMDavid Makowski
AgroParisTech, Université Paris-Saclay, Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement, Département mathématiques, informatique, sciences de la donnée et technologies du numérique, Mathématiques et Informatique Appliquées
Topics & keywords
- Dryness
- Photosynthesis
- Environmental science
- Range (aeronautics)
- Soil water
- Atmospheric sciences
- Soil science
- Biology