Seasonal dynamics of tree growth, physiology, and resin defenses in a northern Arizona ponderosa pine forest

Monica L Gaylord, Thomas E Kolb, Kimberly F. Wallin, Michael R. Wagner

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

During periods of resource stress, such as drought, allocating limited photosynthate between growth and defense is a crucial component of tree survival. Our objectives were to describe the seasonal dynamics of physiology, growth, and resin defense of southwestern ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Laws.) which undergoes regular seasonal drought. We measured leaf-level net photosynthetic rate, leaf water potential, resin flow after phloem wounding, and growth in 24 consecutive months in 2002 and 2003. Precipitation was below average in both years, and 2002 was an extreme drought. In both years, the highest resin flow occurred when tree water stress was highest and photosynthesis was low. Belowground growth was highest in August in both years. Aboveground growth occurred primarily between May and August and was greater in 2003 than in 2002. Temporal variation in resin flow was positively related to temporal variation in needle and radial growth but was not related to temporal variation in root nor shoot growth. Thus, trade-offs in carbon allocation between resin and growth were weak. We discuss these results in the context of water stress in trees, current hypotheses of carbon allocation in plants, and the historical lack of pine bark beetle epidemics in northern Arizona.

Original languageEnglish (US)
Pages (from-to)1173-1183
Number of pages11
JournalCanadian Journal of Forest Research
Volume37
Issue number7
DOIs
StatePublished - Jul 2007

Fingerprint

Pinus ponderosa
tree growth
coniferous forests
resins
physiology
resin
temporal variation
drought
water stress
biomass allocation
carbon
photosynthates
bark beetles
leaf water potential
phloem
wounding
shoot growth
Pinus
defence
photosynthesis

ASJC Scopus subject areas

  • Forestry
  • Plant Science

Cite this

Seasonal dynamics of tree growth, physiology, and resin defenses in a northern Arizona ponderosa pine forest. / Gaylord, Monica L; Kolb, Thomas E; Wallin, Kimberly F.; Wagner, Michael R.

In: Canadian Journal of Forest Research, Vol. 37, No. 7, 07.2007, p. 1173-1183.

Research output: Contribution to journalArticle

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