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- Title
Night and daytime water relations in five fast‐growing tree species: Effects of environmental and endogenous variables.
- Authors
Kupper, Priit; Ivanova, Hiie; Sõber, Anu; Rohula‐Okunev, Gristin; Sellin, Arne
- Abstract
Abstract: Our aim was to investigate the responses of night and daytime water fluxes to environmental stimuli and endogenous drivers in 5 tree species with different water‐use strategies. Data analysis revealed that air vapour pressure deficit (VPD) and wind speed were the main drivers of night‐time sap flux density (Fnight) in all studied species. For Populus × wettsteinii, Populus tremula, Betula pendula, and Alnus glutinosa, VPD was also the major driver of daytime sap flux density (Fday). In Alnus incana, VPD explained less from the total variation in Fday than the photosynthetic photon flux density (QP). The Fday versus VPD regression slope decreased significantly (p < .001) in the following sequence P. × wettsteinii = P. tremula > B. pendula > A. glutinosa > A. incana. However, the Fnight versus VPD regression slope declined (p < .05) in sequence P. × wettsteinii > B. pendula > P. tremula > A. incana = A. glutinosa. P. × wettsteinii and B. pendula demonstrated highest net photosynthesis rates (Pn) among the all investigated species. Multiple regression analysis (independent factors: leaf dark respiration rate and sucrose, glucose, and starch contents) revealed that sucrose content was the only factor, which explained variation (R2 = 0.35; p < .01) in predawn leaf conductance (gpd). Our findings suggest that trees ability to open stomata and lose water at night does not depend directly on their daily water‐use strategy but is determined probably by species photosynthetic capacity, growth potential, and nitrogen‐use strategy.
- Subjects
TREE growth; VAPOUR pressure measurement; PHOTOSYNTHESIS; PHOTON flux; RESPIRATION in plants
- Publication
Ecohydrology, 2018, Vol 11, Issue 6, p1
- ISSN
1936-0584
- Publication type
Article
- DOI
10.1002/eco.1927