Estimation of leaf area index in eucalypt forest with vertical foliage, using cover and fullframe fisheye photography

Macfarlane, C; Arndt, SK; Livesley, SJ; Edgar, AC; White, DA; Adams, MA; Eamus, D

Estimation of leaf area index in eucalypt forest with vertical foliage, using cover and fullframe fisheye photography

Macfarlane, C Arndt, SK Livesley, SJ Edgar, AC White, DA Adams, MA Eamus, D

Permalink

Publication Type:: Journal Article
Citation:: Forest Ecology and Management, 2007, 242 (2-3), pp. 756 - 763
Issue Date:: 2007-04-30

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download full textAdobe PDF (691.3 kB)

View on publisher's site

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Macfarlane, C	en_US
dc.contributor.author	Arndt, SK	en_US
dc.contributor.author	Livesley, SJ	en_US
dc.contributor.author	Edgar, AC	en_US
dc.contributor.author	White, DA	en_US
dc.contributor.author	Adams, MA	en_US
dc.contributor.author	Eamus, D https://orcid.org/0000-0003-2765-8040	en_US
dc.date.issued	2007-04-30	en_US
dc.identifier.citation	Forest Ecology and Management, 2007, 242 (2-3), pp. 756 - 763	en_US
dc.identifier.issn	0378-1127	en_US
dc.identifier.uri	http://hdl.handle.net/10453/3892
dc.description.abstract	This study compared fullframe fisheye photography and cover photography with destructive leaf area index (L) estimation and the Licor LAI-2000 plant canopy analyser (PCA) in plantations of the vertical leaved species Eucalyptus globulus. Fullframe fisheye photography differs from circular fisheye photography in that the images have reduced field of view such that the zenithal range of 0-90° extends to the corners of the rectangular image, roughly doubling image resolution compared to circular images. Cover images instead are obtained by pointing a 70 mm equivalent focal length lens (in 35 mm format) straight upwards. Measurements of cover and indirect estimates of plant area index (Lt) were made in 12 stands of 6-8 years old Eucalyptus globulus. L was measured using destructive sampling and allometry in nine of these stands and ranged from 2.5 to 6.6. Both foliage cover and Lt from the PCA were well correlated with L from allometry, but fullframe fisheye photography provided poor estimates of L despite corrections for foliage clumping. Sampling location had a significant effect on estimates of crown porosity, crown cover and zenithal clumping index from cover photography. The zenithal extinction coefficient (k), calculated from L, crown porosity and cover, ranged from 0.14 to 0.25 and appeared to decrease as L increased; hence, we were unable to obtain an unambiguous estimate of k for E. globulus stands. Nonetheless, the study showed that L can be estimated from foliage cover with similar certainty to that of the PCA. We conclude that the greatest challenge facing indirect estimation of L in forests using photographic methods is to separate the effects of foliage angle from those of foliage clumping. © 2007 Elsevier B.V. All rights reserved.	en_US
dc.relation.ispartof	Forest Ecology and Management	en_US
dc.relation.isbasedon	10.1016/j.foreco.2007.02.021	en_US
dc.subject.classification	Forestry	en_US
dc.title	Estimation of leaf area index in eucalypt forest with vertical foliage, using cover and fullframe fisheye photography	en_US
dc.type	Journal Article
utslib.citation.volume	2-3	en_US
utslib.citation.volume	242	en_US
utslib.for	0705 Forestry Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	open_access
pubs.issue	2-3	en_US
pubs.publication-status	Published	en_US
pubs.volume	242	en_US

Abstract:

This study compared fullframe fisheye photography and cover photography with destructive leaf area index (L) estimation and the Licor LAI-2000 plant canopy analyser (PCA) in plantations of the vertical leaved species Eucalyptus globulus. Fullframe fisheye photography differs from circular fisheye photography in that the images have reduced field of view such that the zenithal range of 0-90° extends to the corners of the rectangular image, roughly doubling image resolution compared to circular images. Cover images instead are obtained by pointing a 70 mm equivalent focal length lens (in 35 mm format) straight upwards. Measurements of cover and indirect estimates of plant area index (Lt) were made in 12 stands of 6-8 years old Eucalyptus globulus. L was measured using destructive sampling and allometry in nine of these stands and ranged from 2.5 to 6.6. Both foliage cover and Lt from the PCA were well correlated with L from allometry, but fullframe fisheye photography provided poor estimates of L despite corrections for foliage clumping. Sampling location had a significant effect on estimates of crown porosity, crown cover and zenithal clumping index from cover photography. The zenithal extinction coefficient (k), calculated from L, crown porosity and cover, ranged from 0.14 to 0.25 and appeared to decrease as L increased; hence, we were unable to obtain an unambiguous estimate of k for E. globulus stands. Nonetheless, the study showed that L can be estimated from foliage cover with similar certainty to that of the PCA. We conclude that the greatest challenge facing indirect estimation of L in forests using photographic methods is to separate the effects of foliage angle from those of foliage clumping. © 2007 Elsevier B.V. All rights reserved.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/3892