Potassium limitation of forest productivity: Part 2: CASTANEA-MAESPA-K shows a reduction in photosynthesis rather than a stoichiometric limitation of tissue formation - Cornut, Ivan; Maire, Guerric le; Laclau, Jean-Paul; Guillemot, Joannès; Nouvellon, Yann; Delpierre, Nicolas (Biogeosciences, 2023)