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Forests 2018, 9(6), 319; https://doi.org/10.3390/f9060319

Effects of a Heat Wave on Nocturnal Stomatal Conductance in Eucalyptus camaldulensis

1
School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
2
Department of Crop and Forest Sciences and AGROTECNIO Center, Universitat de Lleida, 25198 Lleida
3
Department of Environmental Studies, University of California, Santa Cruz, CA 95064, USA, Spain
4
Hawkesbury Institute for the Environment, Western Sydney University, Richmond NSW 2753, Australia
*
Author to whom correspondence should be addressed.
Received: 5 March 2018 / Revised: 10 May 2018 / Accepted: 31 May 2018 / Published: 3 June 2018
(This article belongs to the Special Issue Water and Gas Exchanges in Forests)
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Abstract

Nocturnal transpiration constitutes a significant yet poorly understood component of the global water cycle. Modeling nocturnal transpiration has been complicated by recent findings showing that stomata respond differently to environmental drivers over day- vs. night-time periods. Here, we propose that nocturnal stomatal conductance depends on antecedent daytime conditions. We tested this hypothesis across six genotypes of Eucalyptus camaldulensis Dehnh. growing under different CO2 concentrations (ambient vs. elevated) and exposed to contrasting temperatures (ambient vs. heat wave) for four days prior to the night of measurements, when all plants experienced ambient temperature conditions. We observed significant effects after the heat wave that led to 36% reductions in nocturnal stomatal conductance. The response was partly driven by changes in daytime stomatal behavior but additional factors may have come into play. We also observed significant differences in response to the heat wave across genotypes, likely driven by local adaptation to their climate of origin, but CO2 played no effect. Stomatal models may need to incorporate the role of antecedent effects to improve projections particularly after drastic changes in the environment such as heat waves. View Full-Text
Keywords: climate change; ecological memory; forests; genotype; gas exchange; legacy effects; nighttime processes; transpiration; water climate change; ecological memory; forests; genotype; gas exchange; legacy effects; nighttime processes; transpiration; water
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Resco de Dios, V.; Loik, M.E.; Smith, R.A.; Tissue, D.T. Effects of a Heat Wave on Nocturnal Stomatal Conductance in Eucalyptus camaldulensis. Forests 2018, 9, 319.

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