Utsumi, Yasuhiro , Bobich, Edward , Ewers, Frank W. .
Physiological properties of adult and resprouting California black walnut trees following wildfire.
The differences between the adult and resprouting trees in terms of their uptake of CO2, stomatal conductance, and xylem hydraulic and mechanical properties were studied in Juglans californica (Southern california black walnut) following a wildfire event. In October of 2007 the CO2 uptake rates and stomatal conductance were three times greater in the resprouting trees. Both the predawn and midday water potentials were more negative in the adult trees. The resprouting trees were less vulnerable to water stress induced embolism than the adults. The modulus of elasticity (MOE), modulus of rupture (MOR) and xylem density were greater for the resprouts, indicating that the resprouts have a higher tolerance to water stress and stronger mechanical strength than adult trees. There is no apparent trade-off between the hydraulic efficiency and mechanical strength in the resprouts versus adults, as the resprouts are highly efficient in all the properties we measured. We are continuing to follow the physiology of adults and resprouts seasonally.
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1 - Kyusu University, Shiiba Research Forest, Okawachi 949, Shiiba, Miyazaki, 883-0402, Japan
2 - California State Polytechnic University, Biological Sciences, 3801 West Temple Avenue, Pomona, CA, 91768, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, July 29th, 2008
Time: 10:45 AM