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dc.contributor.authorDungan, RJ
dc.contributor.authorWhitehead, D
dc.date.accessioned2011-07-07T02:29:59Z
dc.date.available2011-07-07T02:29:59Z
dc.date.issued2006
dc.identifier.citationDungan, R. J., & Whitehead, D. (2006). Modelling environmental limits to light use efficiency for a canopy of two broad-leaved tree species with contrasting leaf habit. New Zealand Journal of Ecology, 30(2), 251-259.
dc.identifier.issn0110-6465
dc.identifier.urihttps://hdl.handle.net/10182/3722
dc.description.abstractWe used outputs from a model of canopy carbon uptake [Dungan et al. (2004) Functional Ecology 18: 34–42] and measurements of irradiance (PAR, 400–700 nm) intercepted by the canopy to investigate the effect of daily changes in environmental conditions on daily light use efficiency, ε, for a canopy comprising two broadleaved New Zealand tree species with contrasting leaf habit. Irradiance absorbed by the canopy was 93% of the incident irradiance, and seasonal changes in the proportion of this absorbed by leaves of each species was estimated with a detailed model of leaf area phenology. Over the year, ε for semi-deciduous wineberry (Aristotelia serrata) was 0.43 g C MJ⁻¹ PAR, with maximum and minimum values of 0.80 g C MJ⁻¹ PAR and 0.07 g C MJ⁻¹ PAR in summer and winter respectively. In contrast annual ε was 0.60 g C MJ⁻¹ PAR for winter deciduous fuchsia, with a maximum value of 0.92 g C MJ⁻¹ PAR in spring. The most important environmental regulator of ε for both species was τ, atmospheric transmissivity. Maximum values for ε were estimated on days when τ ≈0.2, on cloudy days in mid-summer. Limits to photosynthesis from restricted root-zone water availability were also important, showing that drought limitations can restrict ε even at a field site with annual rainfall of 4800 mm. Environmental limits to photosynthesis and ε have been investigated for only a few canopy tree species. Uncertainty in models of the national carbon budget required for reporting purposes would be reduced by considering the environmental regulation of ε for a wider range of tree species.
dc.format.extentpp.251-259
dc.language.isoen
dc.publisherNew Zealand Ecological Society
dc.relationThe original publication is available from New Zealand Ecological Society
dc.relation.urihttp://www.nzes.org.nz/nzje/abstract.php?volume_issue=j30_2&pdf_filename=NZJEcol30_2_251.pdf
dc.rightsCopyright © New Zealand Ecological Society
dc.subjectsimulation model
dc.subjectAristotelia serrata
dc.subjectFuchsia excorticata
dc.subjectradiation use efficiency
dc.subjectirradiance interception
dc.titleModelling environmental limits to light use efficiency for a canopy of two broad-leaved tree species with contrasting leaf habit
dc.typeJournal Article
lu.contributor.unitDepartment of Ecology
dc.subject.anzsrc060705 Plant Physiology
dc.subject.anzsrc050102 Ecosystem Function
dc.relation.isPartOfNew Zealand Journal of Ecology
pubs.issue2
pubs.publication-statusPublished
pubs.volume30
lu.subtype


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