![]() In the afternoon, stomatal conductance declined as T leaf approached a daily peak, allowing Ψ L to begin recovery, while sap velocity declined with an exponential relationship with T leaf. In the morning, T leaf and sap velocity displayed a sigmoidal relationship. Sap velocity displayed species-specific diurnal hysteresis patterns reflected by changes in T leaf. ![]() The temporal difference between the peak of g s (late morning) and the peak of VPD (early afternoon) is one of the major regulators of sap velocity hysteresis patterns. The experiment leveraged canopy access towers to measure adjacent trees at the ZF2 and Tapajós tropical forest research (near the cities of Manaus and Santarém). We quantified high resolution temporal dynamics of sap velocity (V s), stomatal conductance (g s) and leaf water potential (Ψ L) of multiple canopy trees, and their correlations with leaf temperature (T leaf) and environmental conditions. ![]() In this study, we contrasted physiological responses of tropical trees during a normal dry season with the extreme dry season due to the 2015–2016 El Niño-Southern Oscillation (ENSO) event. 8Department of Geography, University of California, Berkeley, Berkeley, CA, United StatesĬurrent climate change scenarios indicate warmer temperatures and the potential for more extreme droughts in the tropics, such that a mechanistic understanding of the water cycle from individual trees to landscapes is needed to adequately predict future changes in forest structure and function.7Pacific Northwest National Laboratory, Richland, WA, United States.6Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, United States.5Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN, United States.4Embrapa Amazônia Oriental, Belém, Brazil.3Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, United States.2Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States.1National Institute of Amazonian Research (INPA), Manaus, Brazil.Dawson 3 Charuleka Varadharajan 2 Danielle S. Negrón-Juárez 2 Israel de Jesus Sampaio-Filho 1 Leticia O.
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