Photosynthesis and respiration decline with light intensity in dominant and suppressed Eucalyptus globulus canopies

Functional Plant Biology : FPB
Anthony P O'GradyM Battaglia

Abstract

Within canopy gradients in light-saturated photosynthesis (Amax), foliar nitrogen ([N]area) and leaf dark respiration (R15) were studied in the canopies of dominant and suppressed trees within an even-aged (4-year-old) Eucalyptus globulus (Labill) stand in southern Tasmania. Despite being an even-aged stand growing in a relatively uniform environment with respect to nutrient and water availability, the stand exhibited considerable structural complexity. Diameter at 1.3 m ranged between 3 cm and 21 cm, trees average 12 m height and stand leaf area index was ~6 m2 m-2 leading to strong gradients in light availability. We were interested in understanding the processes governing canopy production in trees of contrasting dominance classes. Vertical gradients in photosynthesis and foliar respiration were studied within the canopies of dominant and suppressed trees during 2006 and 2007. Amax varied from ~18 μmol m-2 s-1 in the upper canopy to 3 μmol m-2 s-1 at lower canopy positions. On average, Amax were higher in the dominant trees than in the suppressed trees. However, at any given height, Amax were similar in suppressed and dominant trees and were strongly related to leaf nitrogen content. Dark respiration varied from ~1.4 μmol m-...Continue Reading

References

Jan 1, 1996·Tree Physiology·M. BattagliaS. Loughhead
May 29, 2004·Trends in Plant Science·Charles R Warren, Mark A Adams
Mar 17, 2006·The New Phytologist·E A Pinkard, C L Mohammed
Jan 29, 2008·The New Phytologist·Lai Fern OwMatthew H Turnbull
May 1, 1991·Ecological Applications : a Publication of the Ecological Society of America·Michael G Ryan

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Citations

Feb 19, 2014·Tree Physiology·Rachael H NolanPatrick N J Lane
May 9, 2014·Tree Physiology·Ulo Niinemets
May 12, 2017·American Journal of Botany·Frida I PiperAlejandra Zúñiga-Feest

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