1. Rising water-use efficiency in European grasslands is driven by increased primary production
- Author
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Christian Poppe Terán, Bibi S. Naz, Alexander Graf, Yuquan Qu, Harrie-Jan Hendricks Franssen, Roland Baatz, Phillipe Ciais, Harry Vereecken, Forschungszentrum Jülich GmbH, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Horizon 2020 Framework Programme, H2020, (871128)
- Subjects
hydro-climate ,[SDE.MCG]Environmental Sciences/Global Changes ,Canopy ,ddc:550 ,General Earth and Planetary Sciences ,water-use efficiency ,Central europe ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,General Environmental Science - Abstract
Water-use efficiency is the amount of carbon assimilated per water used by an ecosystem and a key indicator of ecosystem functioning, but its variability in response to climate change and droughts is not thoroughly understood. Here, we investigated trends, drought response and drivers of three water-use efficiency indices from 1995–2018 in Europe with remote sensing data that considered long-term environmental effects. We show that inherent water-use efficiency decreased by −4.2% in Central Europe, exhibiting threatened ecosystem functioning. In European grasslands it increased by +24.2%, by regulated transpiration and increased carbon assimilation. Further, we highlight modulation of water-use efficiency drought response by hydro-climate and the importance of adaptive canopy conductance on ecosystem function. Our results imply that decoupling carbon assimilation from canopy conductance and efficient water management strategies could make the difference between threatened and well-coping ecosystems with ongoing climate change, and provide important insights for land surface model development.
- Published
- 2023