In situ short‐term responses of Amazonian understory plants to elevated CO2

• DOI: 10.1111/pce.14842
• Publication Date: 2024-02-09T11:55:27Z
• Authors: Amanda Rayane Dam...; Sabrina Garcia; Izabela Fonseca A...; Juliane Cristina ...; Iokanam Sales Per...; Martin G. De Kauwe; Vanessa Rodrigues...; Katrin Fleischer; Thorsten E. E. Grams; Alacimar V. Guedes; Iain Paul Hartley; Bart Kruijt; Laynara Figueired...; Nathielly Pires M...; Richard J. Norby; Julyane Stephanie...; Bruno Takeshi Tan...; Anja Rammig; Leonardo Ramos de...; Flávia Delgado Sa...; Yago Rodrigues Sa...; Crisvaldo Cássio ...; Gabriela Ushida; David Montenegro ...; Carlos Alberto No...; Tomas Ferreira Do...
• Keywords: Understory; Undergrowth

Abstract The response of plants to increasing atmospheric CO 2 depends on the ecological context where are found. Several experiments with elevated (eCO ) have been done worldwide, but Amazonian forest understory has neglected. As central Amazon is limited by light and phosphorus, understanding how responds eCO important for foreseeing will function in future. In a natural Central Amazon, we installed four open‐top chambers as control replicates another under (+250 ppm above ambient levels). Under , observed increases carbon assimilation rate (67%), maximum electron transport (19%), quantum yield (56%), water use efficiency (78%). We also detected an increase leaf area (51%) stem diameter increment (65%). responded positively their ability capture extra primary productivity was allocated supporting more conducting tissues. while maintaining transpiration rates suggests that its contribution evapotranspiration. Therefore, this might be less resistant future extreme drought, no reduction were detected.