Xeromorphy increases in shoots of Pseudotsuga menziesii (Mirb.) Franco seedlings with exposure to elevated temperature but not elevated CO2

Seedling structure influences tree structure and function, ultimately determining the potential productivity of trees and their competitiveness for resources. We investigated changes in shoot structure for seedlings of Pseudotsuga menziesii (Douglas-fir) grown under climate change scenarios of ambie...

Full description

Saved in:
Bibliographic Details
Published in:Trees (Berlin, West) West), 2005-09, Vol.19 (5), p.552-563
Main Authors: Olszyk, D, Apple, M, Gartner, B, Spicer, R, Wise, C, Buckner, E, Benson-Scott, A, Tingey, D
Format: Article
Language:English
Subjects:
Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agricultural and forest meteorology
Agronomy. Soil science and plant productions
allometry
ambient temperature
Biological and medical sciences
biomass
biomass allocation
branches
buds
carbon dioxide
climate change
Climatic adaptation. Acclimatization
climatic factors
environmental factors
forest trees
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
leaves
Pseudotsuga menziesii
seedling growth
stems
tree age
tree and stand measurements
tree growth
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Seedling structure influences tree structure and function, ultimately determining the potential productivity of trees and their competitiveness for resources. We investigated changes in shoot structure for seedlings of Pseudotsuga menziesii (Douglas-fir) grown under climate change scenarios of ambient or elevated CO^sub 2^ (+180 mol mol^sup -1^) plus ambient or elevated temperature (+3.5°C), for 4 years in outdoor, sunlit chambers. Mass allocation and allometry were measured for buds, leaves, branches, and stems, and anatomy was evaluated for leaves and stems. Seedlings became more xeromorphic with elevated temperature: allocation of total mass to branches over stems and leaves increased, sapwood area to height ratio increased, number of growing points relative to seedling size increased, and stem and branch length and mass decreased for sections initiated during the three full CO^sub 2^ and temperature seasons. Neither stem nor leaf anatomy was affected by elevated temperature. Elevated CO^sub 2^ increased specific mass of leaves, but had few other effects on mass allocation, allometry, or anatomy for any shoot organ. There were no CO^sub 2^ × temperature interactions for any important parameter. Thus, under realistic simulated field environmental conditions representative for in at least some P. menziesii forests (i.e., OR, USA, forests with limited soil nitrogen and summer soil moisture), elevated temperature, but not elevated CO^sub 2^, may affect seedling shoot structure and, hence, function.[PUBLICATION ABSTRACT]
ISSN:0931-1890
1432-2285
DOI:10.1007/s00468-005-0414-7