Increasing wood production through old age in tall trees

Stephen C. Sillett, Robert Van Pelt, George W Koch, Anthony R. Ambrose, Allyson L. Carroll, Marie E. Antoine, Brett M. Mifsud

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

How long forest trees can sustain wood production with increasing age remains an open question, primarily because whole-crown structure and growth cannot be readily measured from the ground or on felled trees. We climbed and directly measured crown structures and growth rates of 43 un-suppressed individuals (site trees) of the two tallest species - Eucalyptus regnans and Sequoia sempervirens - representing a wide range of tree sizes and ages. In both species, ground-level measurements of annual growth, including height, ring width, and basal area increment, exhibited the oft-reported trend of decreasing growth (or no change in growth) with age, yet wood production of the entire main trunk and whole crown both increased with size and age up to and including the largest and oldest trees we measured. The balance between structural metrics of whole-crown respiratory demands (cambium area, inner bark volume, sapwood volume, and heartwood deposition area) and photosynthetic capacity (leaf area and green bark area) was statistically independent of size but not age. After accounting for the effect of size, trees with lower potential respiratory demands grew more than trees with higher potential respiratory demands per unit photosynthetic area. The strongest determinant of tree energy balance was the ratio of aboveground cambium area to leaf area. Among the site trees we examined, over 85% of the variation in annual wood production was explained by variation in size, and the proportion of total aboveground wood production in appendages (branches, limbs, and reiterated trunks) increased linearly with size. With increasing age in both species, the proportion of annual wood production converted to heartwood increased in main trunks and appendages. The oldest tree we measured produced more heartwood in its main trunk over 651 years (351 m3) than contained in any tree we measured <1500 years old. The two tallest tree species achieve similar stature despite divergent growth dynamics and ecologies. At one extreme, E. regnans attains great size quickly but dies relatively young because trees are susceptible to fire and fungi. At the other extreme, S. sempervirens attains great size more slowly but has a long lifespan because trees resist fire and prioritize investment in decay-resistant heartwood. Increasing wood production as trees age is a mechanism underlying the maintenance of biomass accumulation during forest development and the carbon-sink capacity of old-growth forests.

Original languageEnglish (US)
Pages (from-to)976-994
Number of pages19
JournalForest Ecology and Management
Volume259
Issue number5
DOIs
StatePublished - Feb 20 2010

Fingerprint

timber production
heartwood
tree crown
tree trunk
Eucalyptus regnans
Sequoia sempervirens
cambium
canopy architecture
appendages
branches
bark
leaf area
tree age
old-growth forests
sapwood
forest trees
carbon sink
carbon sinks
old-growth forest
basal area

Keywords

  • Eucalyptus regnans
  • Sequoia sempervirens
  • Tree age
  • Tree energy balance
  • Tree growth
  • Tree size

ASJC Scopus subject areas

  • Forestry
  • Management, Monitoring, Policy and Law
  • Nature and Landscape Conservation

Cite this

Sillett, S. C., Van Pelt, R., Koch, G. W., Ambrose, A. R., Carroll, A. L., Antoine, M. E., & Mifsud, B. M. (2010). Increasing wood production through old age in tall trees. Forest Ecology and Management, 259(5), 976-994. https://doi.org/10.1016/j.foreco.2009.12.003

Increasing wood production through old age in tall trees. / Sillett, Stephen C.; Van Pelt, Robert; Koch, George W; Ambrose, Anthony R.; Carroll, Allyson L.; Antoine, Marie E.; Mifsud, Brett M.

In: Forest Ecology and Management, Vol. 259, No. 5, 20.02.2010, p. 976-994.

Research output: Contribution to journalArticle

Sillett, SC, Van Pelt, R, Koch, GW, Ambrose, AR, Carroll, AL, Antoine, ME & Mifsud, BM 2010, 'Increasing wood production through old age in tall trees', Forest Ecology and Management, vol. 259, no. 5, pp. 976-994. https://doi.org/10.1016/j.foreco.2009.12.003
Sillett SC, Van Pelt R, Koch GW, Ambrose AR, Carroll AL, Antoine ME et al. Increasing wood production through old age in tall trees. Forest Ecology and Management. 2010 Feb 20;259(5):976-994. https://doi.org/10.1016/j.foreco.2009.12.003
Sillett, Stephen C. ; Van Pelt, Robert ; Koch, George W ; Ambrose, Anthony R. ; Carroll, Allyson L. ; Antoine, Marie E. ; Mifsud, Brett M. / Increasing wood production through old age in tall trees. In: Forest Ecology and Management. 2010 ; Vol. 259, No. 5. pp. 976-994.
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