Stomatal and biochemical limitations to photosynthesis in four tree species in a temperate rainforest dominated by Dacryduim cupressinum in New Zealand

David T. Tissue, Kevin L. Griffin, Matthew H. Turnbull, David Whitehead

    Research output: Contribution to journalArticle

    Abstract

    We assessed the relative limitations to photosynthesis imposed by stomatal and non-stomatal processes in Dacrydium cupressinum Lamb. (Podocarpaceae), which is the dominant species in a native, mixed conifer—broad-leaved rainforest in New Zealand. For comparison, we included three cooccurring broad-leaved tree species (Meterosideros umbellata Cav. (Myrtaceae), Weinmannia racemosa L.f. (Cunoniaceae) and Quintinia acutifolia Kirk (Escalloniaceae)) that differ in phylogeny and in leaf morphology from D. cupressinum. We found that low foliage phosphorus content on an area basis (Pa) limited light-saturated photosynthesis on an area basis (Asat) in Q. acutifolia. Depth in the canopy did not generally affect Asat or the relative limitations to Asat because of stomatal and non-stomatal constraints, despite reductions in the ratio of foliage mass to area, foliar nitrogen on an area basis (Na) and Pa with depth in the canopy. In the canopy-dominant conifer D. cupressinum, Asat was low, consistent with low values of the maximum rate of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) carboxylation (Vcmax). In comparison, the Asat response of the three broad-leaved tree species was quite variable. Although Asat was high in the canopy-dominant M. umbellata, it was low in the sub-canopy trees W. racemosa and Q. acutifolia. Relative stomatal limitation to photosynthesis was more pronounced in W. racemosa (40%) than in the other three species (28–33%). Despite differences in degree, non-stomatal limitation to Asat predominated in all tree species.
    Original languageEnglish
    JournalTree Physiology
    Publication statusPublished - 2005

    Keywords

    • New Zealand
    • Podocarpaceae
    • Rubisco carboxylation
    • electron transport
    • nutrient limitation
    • photosynthesis

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