NDLI: Contrasted allometries between stem diameter, crown area, and tree height in five tropical biogeographic areas

Content Provider	Springer Nature Link
Author	Blanchard, Elodie Birnbaum, Philippe Ibanez, Thomas Boutreux, Thomas Antin, Cécile Ploton, Pierre Vincent, Grégoire Pouteau, Robin Vandrot, Hervé Hequet, Vanessa Barbier, Nicolas Droissart, Vincent Sonké, Bonaventure Texier, Nicolas Kamdem, Narcisse Guy Zebaze, Donatien Libalah, Moses Couteron, Pierre
Copyright Year	2016
Abstract	Across five biogeographic areas, DBH-CA allometry was characterized by inter-site homogeneity and intra-site heterogeneity, whereas the reverse was observed for DBH-H allometry.Tree crowns play a central role in stand dynamics. Remotely sensed canopy images have been shown to allow inferring stand structure and biomass which suggests that allometric scaling between stems and crowns may be tight, although insufficiently investigated to date. Here, we report the first broad-scale assessment of stem vs. crown scaling exponents using measurements of bole diameter (DBH), total height (H), and crown area (CA) made on 4148 trees belonging to 538 species in five biogeographic areas across the wet tropics. Allometries were fitted with power functions using ordinary least-squares regressions on log-transformed data. The inter-site variability and intra-site (sub-canopy vs. canopy trees) variability of the allometries were evaluated by comparing the scaling exponents. Our results indicated that, in contrast to both DBH-H and H-CA allometries, DBH-CA allometry shows no significant inter-site variation. This fairly invariant scaling calls for increased effort in documenting crown sizes as part of tree morphology. Stability in DBH-CA allometry, indeed, suggests that some universal constraints are sufficiently pervasive to restrict the exponent variation to a narrow range. In addition, our results point to inverse changes in the scaling exponent of the DBH-CA vs. DBH-H allometries when shifting from sub-canopy to canopy trees, suggesting a change in carbon allocation when a tree reaches direct light. These results pave the way for further advances in our understanding of niche partitioning in tree species, tropical forest dynamics, and to estimate AGB in tropical forests from remotely sensed images.
Starting Page	1953
Ending Page	1968
Page Count	16
File Format	PDF
ISSN	09311890
Journal	Trees
Volume Number	30
Issue Number	6
e-ISSN	14322285
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-06-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Allometry Tree architecture Stem size Ontogeny Crown light exposure Rainforest Forestry Plant Sciences Agriculture Plant Anatomy/Development Plant Pathology Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Ecology Physiology Plant Science Forestry

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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