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

Understory Undergrowth
DOI: 10.1111/pce.14842 Publication Date: 2024-02-09T11:55:27Z
ABSTRACT
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.
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