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Updated: Feb 9, 2026
05:26
A Venturi Effect Can Help Cure Our Trees
Published on: October 1, 2013
18.4K
Differences in xylogenesis between dominant and suppressed trees.
Shushan Liu1,2, Xiaoxia Li1, Sergio Rossi3,4
1Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China.
American Journal of Botany
|June 7, 2018
Summary
Dominant trees have longer growing seasons than suppressed trees, impacting forest dynamics. Understanding tree size class differences is crucial for accurate climate-growth relationship studies.
Area of Science:
- Dendroecology
- Forest Ecology
- Plant Physiology
Background:
- Most dendroecological research focuses on dominant trees, neglecting the growing season dynamics and environmental sensitivity of suppressed trees.
- Little is known about how tree size influences xylem formation and climate sensitivity in species like Abies fabri.
Purpose of the Study:
- To compare xylem formation dynamics between dominant and suppressed Abies fabri trees of similar age.
- To investigate the association between xylem growth and climate in different tree size classes.
- To understand the role of competition in modulating tree growth periods.
Main Methods:
- Weekly monitoring of xylogenesis timing and duration in histological sections.
- Study conducted over three growing seasons (2013-2015).
- Analysis of trees from the Gongga Mountains, southeastern Tibetan Plateau.
Main Results:
- Xylogenesis timing and duration varied significantly with canopy position and tree size.
- Dominant trees initiated xylogenesis 6-14 days earlier and ended it 5-11 days later than suppressed trees.
- Dominant trees exhibited a longer growing season and higher temperature sensitivity in tracheid production rate.
Conclusions:
- Competition significantly affects tree growth by shortening the growing period of suppressed trees.
- Tree size class is a critical factor influencing xylogenesis and climate sensitivity.
- Accurate climate-growth relationship assessments require the inclusion of all tree size classes.
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