Hydraulic compensation in northern Rocky Mountain conifers: does successional position and life history matter?

Oecologia
Anna Sala

Abstract

As trees grow tall and the resistance of the hydraulic pathway increases, water supply to foliage may decrease forcing stomata to close and CO2 uptake to decline. Several structural (e.g. biomass allocation) and physiological adjustments, however, may partially or fully compensate for such hydraulic constraints and prevent limitations on CO2 uptake and growth. The degree to which trees compensate for hydraulic constraints as they grow tall may depend on the costs and benefits associated with hydraulic compensation according to their ecology and life history. Because later successional Rocky Mountain conifers are more shade tolerant, optimization of CO2 uptake as trees grow tall and shade increases may confer greater benefits than in earlier successional species. If so, higher compensation for hydraulic constraints is expected in later successional species relative to co-occurring earlier successional species. I have examined height-related changes of crown stomatal conductance on a leaf area basis (G(LA)) and leaf to sapwood ratios (A(L):A(S)) for five conifer species in the northern Rocky Mountains. Species were arranged in pairs, each pair consisting of an early and late successional species. For high elevations I used, respe...Continue Reading

References

Apr 17, 2001·Tree Physiology·K Makkonen, H S Helmisaari
Feb 7, 2002·Tree Physiology·Nathan PhillipsMichael G Ryan
Aug 20, 2002·Tree Physiology·Nate G McDowellMichael G Ryan
Mar 26, 2003·Tree Physiology·Stan D. WullschlegerR. A. Vertessy
Mar 26, 2003·Tree Physiology·Robert M. HubbardMichael G. Ryan
Apr 23, 2004·Nature·George W KochStephen D Davis
Nov 1, 2005·Ecology Letters·M MencucciniB Michiels
Oct 1, 1996·Evolution; International Journal of Organic Evolution·Atsushi Yamauchi

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Citations

Nov 22, 2008·Plant, Cell & Environment·Anna Sala, Günter Hoch
Aug 15, 2012·The New Phytologist·Anna SalaElizabeth E Crone

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