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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.

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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.

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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.