Effects of leaf aggregation in a broad-leaf canopy on estimates of leaf area index by the gap-fraction method |
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| Institution: | 1. Systematic Botany and Functional Biodiversity, Institute of Biology, Leipzig University, Leipzig, Germany;2. German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany;3. Institute of Ecology and Evolution, Friedrich Schiller University Jena, Jena, Germany;4. Institute of Biology, Leipzig University, Leipzig, Germany;5. Department of Forestry, School of Agriculture and Forestry, University of Córdoba, Córdoba, Spain;6. School of Biology, Industrial University of Santander, Bucaramanga, Colombia;7. UFZ, Helmholtz Centre for Environmental Research, Physiological Diversity, Leipzig, Germany;8. Institute of Mathematics, Friedrich Schiller University Jena, Jena, Germany;9. Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zürich, Switzerland;10. Fredericton Research and Development Centre, Agriculture and Agri-Food Canada, Fredericton, NB, Canada;11. Max Planck Institute for Biogeochemistry, Jena, Germany;1. Island Ecology and Biogeography Group, Instituto Universitario de Enfermedades Tropicales y Salud Pública de Canarias (IUETSPC), Universidad de La Laguna (ULL), Avda. Astofísico Francisco Sánchez s/n, La Laguna 38206, Canary Islands, Spain;2. Oxford Long-term Ecology Laboratory, Biodiversity Institute, Department of Zoology, University of Oxford, Tinbergen Building, South Parks Road, Oxford, OX1 3PS, United Kingdom;3. Department of Biology, University of Bergen, Post Box 7803, N-5020, Norway;4. Conservation Biogeography and Macroecology Programme, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, United Kingdom;5. Center for Macroecology, Evolution and Climate, Department of Biology, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen Ø, Denmark |
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| Abstract: | We compared leaf area index (LAI) estimates of a broad-leaf tropical hardwood, Metrosideros polymorpha Gaud (‘Ōhi’a), using a optical method (LI-COR LAI-2000) and direct determination (harvest and allometry). There was a strong correlation between LAI estimates by the two methods, but direct estimates were higher than the optical estimates by a factor of 2.44. The ratio of harvest leaf area to projected leaf area within twigs was similar (2.42) to that of whole plots, suggesting that aggregation of leaves at this scale of branching may account for most of the underestimate by the optical method. The within-branch ratio of actual to projected leaf area did not differ among three sites on three islands of varying land surface age but similar climate, suggesting that a correction factor determined by harvest could be used to adjust optical estimates of LAI in other M. polymorpha forests. |
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