Journal
TREE PHYSIOLOGY
Volume 32, Issue 4, Pages 373-388Publisher
OXFORD UNIV PRESS
DOI: 10.1093/treephys/tps015
Keywords
stomatal control; xylem embolism
Categories
Funding
- National Science Foundation [DEB 0919381, 0948914]
- California Energy Commission PIER [PIR-080005]
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [0948914] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [0919381] Funding Source: National Science Foundation
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Establishing quantitative links between plant hydraulic properties and the response of transpiration to environmental factors such as atmospheric vapor pressure deficit (D) is essential for improving our ability to understand plant water relations across a wide range of species and environmental conditions. We studied stomatal responses to D in irrigated trees in the urban landscape of Los Angeles, California. We found a strong linear relationship between the sensitivity of tree-level transpiration estimated from sap flux (m(T); slope of the relationship between tree transpiration and ln D) and transpiration at D = 1 kPa (E-Tref) that was similar to previous surveys of stomatal behavior in natural environments. In addition, m(T) was significantly related to vulnerability to cavitation of branches (P-50). While m(T) did not appear to differ between ring- and diffuse-porous species, the relationship between m(T) and P-50 was distinct by wood anatomy. Therefore, our study confirms systematic differences in water relations in ring- versus diffuse-porous species, but these differences appear to be more strongly related to the relationship between stomatal sensitivity to D and vulnerability to cavitation rather than to stomatal sensitivity per se.
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