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Journal Articles Philosophical Transactions of the Royal Society B: Biological Sciences Year : 2020

Sensitivity of gross primary productivity to climatic drivers during the summer drought of 2018 in Europe

Ana Bastos
Paul Stoy
Hui Yang
Julia Green
Bingxue Wang
  • Function : Author
Kailiang Yu
  • Function : Author
Yuanyuan Huang
  • Function : Author
Alexander Knohl
Ladislav Šigut
Mana Gharun
Matthias Cuntz
Nicola Arriga
  • Function : Author
Marilyn Roland
  • Function : Author
Matthias Peichl
Mirco Migliavacca
Edoardo Cremonese
Andrej Varlagin
Christian Brümmer
  • Function : Author
Louis Gourlez de La Motte
  • Function : Author
Silvano Fares
Nina Buchmann
Tarek El-Madany
  • Function : Author
Andrea Pitacco
Nadia Vendrame
  • Function : Author
Zhaolei Li
  • Function : Author
Caroline Vincke
  • Function : Author
Enzo Magliulo
  • Function : Author
Franziska Koebsch
  • Function : Author

Abstract

In summer 2018, Europe experienced a record drought, but it remains unknown how the drought affected ecosystem carbon dynamics. Using observations from 34 eddy covariance sites in different biomes across Europe, we studied the sensitivity of gross primary productivity (GPP) to environmental drivers during the summer drought of 2018 versus the reference summer of 2016. We found a greater drought-induced decline of summer GPP in grass- lands (−38%) than in forests (−10%), which coincided with reduced evapotranspiration and soil water content (SWC). As com- pared to the ‘normal year’ of 2016, GPP in different ecosystems exhibited more negative sensitivity to summer air temperature (Ta) but stronger positive sensitivity to SWC during summer drought in 2018, that is, a stronger reduction of GPP with soil moisture deficit. We found larger negative effects of Ta and vapour pressure deficit (VPD) but a lower positive effect of photosynthetic photon flux density on GPP in 2018 compared to 2016, which contributed to reduced summer GPP in 2018. Our results demonstrate that high temperature-induced increases in VPD and decreases in SWC aggravated drought impacts on GPP.

Dates and versions

hal-02942642 , version 1 (18-09-2020)

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Zheng Fu, Philippe Ciais, Ana Bastos, Paul Stoy, Hui Yang, et al.. Sensitivity of gross primary productivity to climatic drivers during the summer drought of 2018 in Europe. Philosophical Transactions of the Royal Society B: Biological Sciences, 2020, 375 (1810), pp.20190747. ⟨10.1098/rstb.2019.0747⟩. ⟨hal-02942642⟩
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