| Abstract Detail
Recent Topics Posters Zieminska, Kasia [1], Rosa, Emily [2], Gleason, Sean [3]. Where does stem water capacitance come from? Water stored in wood creates a buffer, which presumably plays a significant role during drought. Most information about water storage strategies relates to tropical trees and we know very little about temperate trees. The structural drivers of water storage remain unclear too. We asked: how much water can be stored and released from wood into the transpiration stream, and which tissue drives this hydraulic behavior?
We examined water storage, capacitance (water released per change between predawn and midday water potential) and wood anatomy in twigs of 30 temperate, deciduous tree species grown in the Arnold Arboretum of Harvard University in Boston, USA. The species represented a broad phylogenetic range and diverse anatomies.
The difference in wood volumetric water content between predawn and midday ranged from 1 to 9% and capacitance varied from near 0 to ~100 kg m-3 MPa-1, with one outlier species reaching above 400 kg m-3 MPa-1. Species with higher parenchyma lumen fraction tended to store water closer to their maximum storage capacity, but only in ring- and semi-ring-porous species, not in diffuse-porous. Species with higher fibre lumen fraction tended to store less water. Capacitance did not correlate with any tissue fraction suggesting tissue fractions do not constrain capacitance.
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1 - Arnold Arboretum of Harvard University, Boston, MA, 02131, USA
2 - California State University - Sonoma
3 - USDA, Water Management and System Research Unit, Fort Collins, CO
Keywords:
Wood anatomy
capacitance
water content
parenchyma
fibers.
Presentation Type: Recent Topics Poster
Session: P, Recent Topics Posters
Location: Grand Ballroom - Exhibit Hall/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 5:30 PM
Number: PRT011
Abstract ID:1291
Candidate for Awards:None |
