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Forests 2018, 9(8), 449; https://doi.org/10.3390/f9080449

Hydraulic Constraints to Whole-Tree Water Use and Respiration in Young Cryptomeria Trees under Competition

1
Aragon Agency for research and development (ARAID), E-50018 Zaragoza, Spain
2
Forest Resources Unit, Agrifood Research and Technology Centre of Aragón (CITA), Avenida Montañana 930, E-50059 Zaragoza, Spain
3
Faculty of Agriculture, Yamagata University, Wakaba-machi 1-23, Tsuruoka-shi, Yamagata 997-8555, Japan
*
Author to whom correspondence should be addressed.
Received: 30 May 2018 / Revised: 19 July 2018 / Accepted: 23 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Water and Gas Exchanges in Forests)
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Abstract

Although extensive studies have focused on carbon and water balance from aboveground measurements, the link between the belowground and aboveground processes deserves greater attention. In this context, the aim of this work was to assess the bi-directional feedback between whole-plant respiration and transpiration. The study was performed on 25 saplings of Sugi (Japanese cedar, Cryptomeria japonica D. Don), including dominant and suppressed individuals (total fresh weight ranging between 0.2 and 8.0 kg). During one week, the integrated water use (WU) was determined using the Deuterium dilution method. After this, the trees were uprooted and the root, stem, and leaf respiration were measured using incubation chambers and CO2 infrared sensors. The stem and root respiration followed a power response to mass (power exponent b < 1), implying a decline in mass-specific respiration with size. Conversely, the leaf respiration followed a near-linear increase with size (power exponent b ≈ 1), but was negatively affected by the stem density, indicating the hydraulic limitations of the leaf metabolism. The water use followed a power response with the tree size (b < 1), showing a decline in the transpiration per leaf mass with the tree size, but was also negatively correlated with the stem density. Our results indicate that dominant trees are more efficient in the use of water, and highlight the role of hydraulic limitations to leaf metabolism in suppressed trees. View Full-Text
Keywords: metabolic scaling; transpiration; respiration; shoot/root ratio; competition; hydraulic limitation; water storage; Deuterium dilution; sap flow; stable isotopes metabolic scaling; transpiration; respiration; shoot/root ratio; competition; hydraulic limitation; water storage; Deuterium dilution; sap flow; stable isotopes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ferrio, J.P.; Kurosawa, Y.; Wang, M.; Mori, S. Hydraulic Constraints to Whole-Tree Water Use and Respiration in Young Cryptomeria Trees under Competition. Forests 2018, 9, 449.

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