Estimation of leaf area index in eucalypt forest using digital photography

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Show simple item record Macfarlane, C Hoffman, M Eamus, D Kerp, N Higginson, S McMurtrie, R Adams, M 2009-12-21T02:29:10Z 2007-04-10
dc.identifier.citation Agricultural and Forest Meteorology, 2007, 143 (3-4), pp. 176 - 188
dc.identifier.issn 0168-1923
dc.identifier.other C1 en_US
dc.description.abstract We tested whether leaf area index (L) in eucalypt vegetation could be accurately estimated from gap fraction measurements made using both fisheye and non-fisheye digital photography. We compared methods that measure the gap fraction at a single zenith angle (0° or 57°), with fisheye photography that measures the gap fraction at multiple zenith angles. We applied these methods in an unthinned stand of the broadleaf tree species Eucalyptus marginata that had an initial L of 3. We removed one-third of the trees and reapplied the methods, and then removed another one-third of the trees and applied the methods a third time. L from the photographic methods was compared to L obtained from destructive sampling and allometry. We found that L was accurately estimated from non-fisheye images taken at the zenith, providing that the total gap fraction was divided into large, between-crown gaps and smaller, within-crown gaps, prior to using the Beer-Lambert law to estimate L. This rapid and simple method corrected for foliage clumping and provided estimates of crown porosity, crown cover, foliage cover and the foliage clumping index at the zenith, but required an assumption about the light extinction coefficient at the zenith. Fisheye photography also provided good estimates of L but only if the images were corrected for the gamma function of the digital camera, and the combined Chen-Cihlar and Lang-Xiang method of correcting for foliage clumping was used. The clumping index derived from fisheye images was insensitive to thinning but the calculated foliage projection coefficient was. Methods of obtaining and analysing gap fraction and gap size distributions from fisheye photography need further improvement to separate the effects of foliage clumping and leaf angle distribution. © 2006 Elsevier B.V. All rights reserved.
dc.language eng
dc.relation.isbasedon 10.1016/j.agrformet.2006.10.013
dc.title Estimation of leaf area index in eucalypt forest using digital photography
dc.type Journal Article
dc.parent Agricultural and Forest Meteorology
dc.journal.volume 3-4
dc.journal.volume 143
dc.journal.number 3-4 en_US
dc.publocation Amsterdam, Netherlands en_US
dc.identifier.startpage 176 en_US
dc.identifier.endpage 188 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0705 Forestry Sciences
dc.personcode 000006
dc.percentage 100 en_US Forestry Sciences en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Canopy cover
dc.description.keywords Clumping index
dc.description.keywords Digital photography
dc.description.keywords Eucalypt forest
dc.description.keywords Gap fraction
dc.description.keywords Leaf area index
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history Closed (ID: 3)

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