Modelling environmental limits to light use efficiency for a canopy of two broad-leaved tree species with contrasting leaf habit
dc.contributor.author | Dungan, RJ | |
dc.contributor.author | Whitehead, D | |
dc.date.accessioned | 2011-07-07T02:29:59Z | |
dc.date.available | 2011-07-07T02:29:59Z | |
dc.date.issued | 2006 | |
dc.description.abstract | We 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.extent | pp.251-259 | |
dc.identifier.citation | Dungan, 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.issn | 0110-6465 | |
dc.identifier.uri | https://hdl.handle.net/10182/3722 | |
dc.language.iso | en | |
dc.publisher | New Zealand Ecological Society | |
dc.relation | The original publication is available from New Zealand Ecological Society | |
dc.relation.isPartOf | New Zealand Journal of Ecology | |
dc.relation.uri | https://www.nzes.org.nz/nzje/abstract.php?volume_issue=j30_2&pdf_filename=NZJEcol30_2_251.pdf | |
dc.rights | Copyright © New Zealand Ecological Society | |
dc.subject | simulation model | |
dc.subject | Aristotelia serrata | |
dc.subject | Fuchsia excorticata | |
dc.subject | radiation use efficiency | |
dc.subject | irradiance interception | |
dc.subject.anzsrc | ANZSRC::060705 Plant Physiology | |
dc.subject.anzsrc | ANZSRC::050102 Ecosystem Function | |
dc.title | Modelling environmental limits to light use efficiency for a canopy of two broad-leaved tree species with contrasting leaf habit | |
dc.type | Journal Article | |
lu.contributor.unit | Department of Ecology | |
lu.subtype | ||
pubs.issue | 2 | |
pubs.publication-status | Published | |
pubs.volume | 30 |
Files
Original bundle
1 - 1 of 1
No Thumbnail Available
- Name:
- NZJEcol30_2_251.pdf
- Size:
- 124.89 KB
- Format:
- Adobe Portable Document Format
- Description:
- Journal article
Licence bundle
1 - 1 of 1
No Thumbnail Available
- Name:
- license.txt
- Size:
- 2.44 KB
- Format:
- Item-specific license agreed upon to submission
- Description: