Seasonal Change in the CO<sub>2</sub> Fixation Rate and Water-Use Efficiency of Broad-leaved Tree Species on Jeju Island

<p>Functional group-specific water use strategies are vital in understanding plant performance under current and future global climate change related drought scenarios. Different functional groups have different strategies to regulate their above ground water use and loss in order to respond to drought stress. Here, we studied the ecohydrological response of a controlled rain forest system to a 10-week lasting experimental drought (Biosphere 2 Water, Atmosphere, and Life Dynamics, B2 WALD project). Using gas exchange chambers, we specifically investigated the response of the two main rain forest functional groups - three canopy tree species and two understory species - in their above ground water use efficiency. Rates and isotopic fluxes of transpiration, assimilation and night respiration were monitored in high temporal resolution. In combination with plant physiological information (i.e., leaf water potential) a complete picture of their above ground water use could be gained. We expect that the deep rooting canopy tree species will be able to keep their above ground water use constant while the shallow rooting understory species will have to adapt their water use efficiency to budget their water reserves and resources.</p>

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Large variation in whole-plant water-use efficiency among tropical tree species

New Phytologist ◽

10.1111/j.1469-8137.2006.01913.x ◽

2006 ◽

Vol 173 (2) ◽

pp. 294-305 ◽

Cited By ~ 70

Author(s):

Lucas A. Cernusak ◽

Jorge Aranda ◽

John D. Marshall ◽

Klaus Winter

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Tree Species ◽

Tropical Tree ◽

Plant Water ◽

Tropical Tree Species ◽

Plant Water Use ◽

Whole Plant ◽

Use Efficiency

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Water-use efficiency and whole-plant performance of nine tropical tree species at two sites with contrasting water availability in Panama

Trees ◽

10.1007/s00468-012-0818-0 ◽

2012 ◽

Vol 27 (3) ◽

pp. 639-653 ◽

Cited By ~ 17

Author(s):

D. Craven ◽

J. S. Hall ◽

M. S. Ashton ◽

G. P. Berlyn

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Water Availability ◽

Tree Species ◽

Tropical Tree ◽

Plant Performance ◽

Tropical Tree Species ◽

Whole Plant ◽

Use Efficiency

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Leaf characteristics, wood anatomy and hydraulic properties in tree species from contrasting habitats within upper Rio Negro forests in the Amazon region

Journal of Tropical Ecology ◽

10.1017/s0266467409990538 ◽

2010 ◽

Vol 26 (2) ◽

pp. 215-226 ◽

Cited By ~ 11

Author(s):

M. A. Sobrado

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Water Loss ◽

Tree Species ◽

Mixed Forest ◽

High Water ◽

Hydraulic Characteristics ◽

Use Efficiency ◽

Species Specific

Abstract:Leaf blade physical and chemical characteristics, wood composition and anatomy, as well as long-term water-use efficiency and hydraulic characteristics of leaf-bearing terminal branches were assessed in tree species growing in contrasting forests of the Venezuelan Amazonas: mixed forest on oxisol soil and caatinga on podzol soil. Two upper-canopy tree species were selected in each forest, and three individuals per species were tagged for sampling. Leaf nitrogen isotopic signatures (δ15N) were negative and species-specific, which suggests that in species of both forest the N-cycle is closed, and that tree species can withdraw N from a variety of N-pools. Leaf construction costs, dry mass to leaf area ratio, thickness and sclerophylly index tended to increase in microhabitats with lower fertility and large water table fluctuations. The hydraulic characteristics and long-term water use are species-specific and related to the particular conditions of the habitat at the local scale. Ocotea aciphylla (mixed forest) with a combination of low δ13C and high hydraulic sufficiency may maintain high water loss without risk of xylem embolisms. By contrast, Micranda sprucei (slopes of the caatinga forest), had a combination of relatively high hydraulic sufficiency and the highest long-term water-use efficiency, which suggest that embolism risk would be avoided by water loss restriction. Assuming a warmer and drier climate in the future, the species with more conservative water transport and/or better stomatal control would be at lower risk of mortality.

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