Estimation of leaf area index in eucalypt forest using digital photography

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Show simple item record Macfarlane, Chelsea en_US Hoffman, Mark en_US Eamus, Derek en_US Kerp, N en_US Higginson, S en_US Mcmurtrie, Ross en_US Adams, Mark en_US 2009-12-21T02:29:10Z 2009-12-21T02:29:10Z 2007 en_US
dc.identifier 2006011456 en_US
dc.identifier.citation Macfarlane Chelsea et al. 2007, 'Estimation of leaf area index in eucalypt forest using digital photography', Elsevier Science Bv, vol. 143, no. 3-4, pp. 176-188. en_US
dc.identifier.issn 0168-1923 en_US
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 angles. We applied these methods in an unthinned stand of the broadleaf tree species Ecualyptus marginata that had an intial 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 tjird time. L from the photographic methods was compared to L obtained from destrictive sampling and allometry. We found that L was accurately estimated from non-fisheye images taken at the zenith, providing thaty 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 simpel 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 lgiht extenction coefficient at the zenith. Fisheye photography also provided good estimates of L bit only if the images were corrected for the gamma function of the digital camera, and the combined Chen-Chilar and Lang-Xiang method of correcting for foliage prjection coefficient was. Method of obtaining and analysising gap fraction and gap size distributions from fisheye photography need further improvement to separate the effects of foliage clumping and leaf angle distribution. en_US
dc.publisher Elsevier Science Bv en_US
dc.relation.isbasedon en_US
dc.title Estimation of leaf area index in eucalypt forest using digital photography en_US
dc.parent Agricultural And Forest Meteorology en_US
dc.journal.volume 143 en_US
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 070500 en_US
dc.personcode 0000024134 en_US
dc.personcode X000123 en_US
dc.personcode 000006 en_US
dc.personcode 0000032671 en_US
dc.personcode 0000032672 en_US
dc.personcode 0000017302 en_US
dc.personcode 0000032824 en_US
dc.percentage 100 en_US Forestry Sciences en_US
dc.classification.type FOR-08 en_US
dc.description.keywords eucalypt forest, leaf area index, digital photography, gap fraction, canopy cover, clumping index en_US

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