Contrasting patterns of biomass allocation in dominant and suppressed loblolly pine

Shawna L. Naidu, Evan H. DeLucia, Richard B. Thomas

Research output: Contribution to journalArticle

Abstract

We investigated above- and below-ground biomass allocation and allometric relationships of canopy dominant and suppressed loblolly pine (Pinus taeda L.) trees from a range of diameters at breast height (DBH = 3.5-35.6 cm) to determine if shifts in allocation may influence the growth and persistence of suppressed trees in the understory. Using mass and volume conversions from harvested trees (15 dominant and 15 suppressed), we developed regressions to predict total and component biomass from DBH. Bole, branch, needle, and total mass differed between dominance categories (ANCOVA, P < 0.10). For a representative size (15 cm DBH), dominant trees allocated 63.4, 13.2, 11.3, and 12.0% of biomass to bole, branch, needle, and root tissue compared with 75.9, 6.7, 5.6, and 11.7% for suppressed trees. At any given DBH, suppressed trees were also taller than dominant trees and had a greater proportion of heterotrophic (bole plus branch plus root mass) to autotrophic (needle mass) tissue. Percent carbon and nitrogen of tissues did not differ between dominance categories. Unlike the increased investment in leaf area observed for seedlings and saplings of shade-tolerant species, suppressed loblolly pine increased allocation to bole mass and height growth. An increase in height for this shade-intolerant species may enable some suppressed individuals to escape competition for light. However, increased allocation to heterotrophic versus autotrophic tissue in suppressed trees may confer a cumulative disadvantage over time because of increased respiratory load.

Original languageEnglish (US)
Pages (from-to)1116-1124
Number of pages9
JournalCanadian Journal of Forest Research
Volume28
Issue number8
DOIs
StatePublished - Aug 1998

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biomass allocation
Pinus taeda
dry matter partitioning
tree trunk
shade
belowground biomass
biomass
sapling
saplings
tree and stand measurements
leaf area
understory
persistence
canopy
seedling
seedlings
tissues
tissue
carbon
nitrogen

ASJC Scopus subject areas

  • Global and Planetary Change
  • Forestry
  • Ecology

Cite this

Contrasting patterns of biomass allocation in dominant and suppressed loblolly pine. / Naidu, Shawna L.; DeLucia, Evan H.; Thomas, Richard B.

In: Canadian Journal of Forest Research, Vol. 28, No. 8, 08.1998, p. 1116-1124.

Research output: Contribution to journalArticle

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