Differences in xylogenesis between dominant and suppressed trees

Premise of The Study Most dendroecological studies focus on dominant trees, but little is known about the growing season of trees belonging to different size classes and their sensitivity to biotic factors. The objective of this study was to compare the dynamics of xylem formation between dominant a...

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Bibliographic Details
Published in:American journal of botany 2018-05, Vol.105 (5), p.950-956
Main Authors: Liu, Shushan, Li, Xiaoxia, Rossi, Sergio, Wang, Lily, Li, Wei, Liang, Eryuan, Leavitt, Steven W.
Format: Article
Language:English
Subjects:
Abies fabri
Biotic factors
BRIEF COMMUNICATION
cambial activity
Climate
competition
Ecology
Environmental effects
Forest ecosystems
Forests
Histology
Identification methods
Mountains
Pinaceae
secondary growth
Sensitivity
Tibetan Plateau
Trees
Xylem
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Summary:Premise of The Study Most dendroecological studies focus on dominant trees, but little is known about the growing season of trees belonging to different size classes and their sensitivity to biotic factors. The objective of this study was to compare the dynamics of xylem formation between dominant and suppressed trees of Abies fabri of similar age growing in the Gongga Mountains, southeastern Tibetan Plateau, and to identify the association between xylem growth and climate. Methods The timing and duration of xylogenesis in histological sections were investigated weekly during the 2013–2015 growing seasons. Key Results Our investigation found that timing and duration of xylogenesis varied with canopy position and its associated tree size. Xylogenesis started 6–14 days earlier, and ended 5–11 days later in dominant trees than in suppressed trees, resulting in a significantly longer growing season. Dominant trees also exhibited higher temperature sensitivity of tracheid production rate than suppressed trees. Conclusions The observed differences in xylogenesis among trees suggested that competition affects tree growth by reducing the growing period in suppressed trees. Representative climate–growth relationships should involve trees of all size classes when evaluating the effects of the environment on forest dynamics.
ISSN:0002-9122
1537-2197
DOI:10.1002/ajb2.1089