Pantropical variability in tree crown allometry
Copyright policy )Pantropical variability in tree crown allometry
AbstractAimTree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large‐scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site‐specific crown allometry and assessed their relationships with environmental and stand‐level variables in the tropics.LocationGlobal tropics.Time periodEarly 21st century.Major taxa studiedWoody plants.MethodsUsing a dataset of 87,737 trees distributed among 245 forest and savanna sites across the tropics, we fitted site‐specific allometric relationships between crown dimensions (crown depth, diameter and volume) and stem diameter using power‐law models. Stand‐level and environmental drivers of crown allometric relationships were assessed at pantropical and continental scales.ResultsThe scaling exponents of allometric relationships between stem diameter and crown dimensions were higher in savannas than in forests. We identified that continental crown models were better than pantropical crown models and that continental differences in crown allometric relationships were driven by both stand‐level (wood density) and environmental (precipitation, cation exchange capacity and soil texture) variables for both tropical biomes. For a given diameter, forest trees from Asia and savanna trees from Australia had smaller crown dimensions than trees in Africa and America, with crown volumes for some Asian forest trees being smaller than those of trees in African forests.Main conclusionsOur results provide new insight into geographical variability, with large continental differences in tropical tree crown allometry that were driven by stand‐level and environmental variables. They have implications for the assessment of ecosystem function and for the monitoring of woody biomass by remote sensing techniques in the global tropics.
- Université de Montpelleir France
- Université de Montpellier France
- TU Dresden Germany
- University of London United Kingdom
- DePaul University United States
Biomass (ecology), SAVANNA, télédétection, forêt tropicale, forest, biomasse aérienne des arbres, K01 - Foresterie - Considérations générales, [SDV.EE.ECO] Life Sciences [q-bio]/Ecology, environment/Ecosystems, http://aims.fao.org/aos/agrovoc/c_28174, Tropical biomes, level variable, Global and Planetary Change, Geography, Phylogenetics and taxonomy, Life sciences, Houppier, crown allometry, Tree Allometry, Physical Sciences, Medicine, environment, FOREST BIOMASS ESTIMATION, MODELS, Diameter at breast height, Environment, soil, classe de cime, Agriculture & agronomie, Biology, Nature and Landscape Conservation, Genus, Global Forest Drought Response and Climate Change, MORTALITY, DIAMETER, allométrie, Tropics, Environmental Management, Ecological Applications, FOS: Biological sciences, Dentistry, Environmental Science, [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, WOOD DENSITY, 634, Precipitation, Tree allometry, http://aims.fao.org/aos/agrovoc/c_24962, Estimation of Forest Biomass and Carbon Stocks, F50 - Anatomie et morphologie des plantes, Soil, HEIGHT, Biodiversity Conservation and Ecosystem Management, zone tropicale, Savanna, DISTURBANCE, http://aims.fao.org/aos/agrovoc/c_6498, Biomass partitioning, ARCHITECTURE, Ecology, [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics, Agriculture & agronomy, Biologie végétale (sciences végétales, sylviculture, mycologie...), http://aims.fao.org/aos/agrovoc/c_5954, http://aims.fao.org/aos/agrovoc/c_7979, Sciences du vivant, forest precipitation, environment/Ecosystems, http://aims.fao.org/aos/agrovoc/c_1373987680230, Tree Height-Diameter Models, Phytobiology (plant sciences, forestry, mycology...), Pantropical, precipitation, Stand‐level variable, [SDV.BV.BOT] Life Sciences [q-bio]/Vegetal Biology/Botanics, http://aims.fao.org/aos/agrovoc/c_24904, [SDV.BID.SPT] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy, Forest, stand‐, Ecologie [végétale], Crown allometry, anatomie végétale, tropical biomes, Allometry, FOS: Clinical medicine, http://aims.fao.org/aos/agrovoc/c_16172, savanna, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, SIZE, stand‐level variable, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, stand-level variable, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Crown (dentistry), Environmental Sciences
Biomass (ecology), SAVANNA, télédétection, forêt tropicale, forest, biomasse aérienne des arbres, K01 - Foresterie - Considérations générales, [SDV.EE.ECO] Life Sciences [q-bio]/Ecology, environment/Ecosystems, http://aims.fao.org/aos/agrovoc/c_28174, Tropical biomes, level variable, Global and Planetary Change, Geography, Phylogenetics and taxonomy, Life sciences, Houppier, crown allometry, Tree Allometry, Physical Sciences, Medicine, environment, FOREST BIOMASS ESTIMATION, MODELS, Diameter at breast height, Environment, soil, classe de cime, Agriculture & agronomie, Biology, Nature and Landscape Conservation, Genus, Global Forest Drought Response and Climate Change, MORTALITY, DIAMETER, allométrie, Tropics, Environmental Management, Ecological Applications, FOS: Biological sciences, Dentistry, Environmental Science, [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, WOOD DENSITY, 634, Precipitation, Tree allometry, http://aims.fao.org/aos/agrovoc/c_24962, Estimation of Forest Biomass and Carbon Stocks, F50 - Anatomie et morphologie des plantes, Soil, HEIGHT, Biodiversity Conservation and Ecosystem Management, zone tropicale, Savanna, DISTURBANCE, http://aims.fao.org/aos/agrovoc/c_6498, Biomass partitioning, ARCHITECTURE, Ecology, [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics, Agriculture & agronomy, Biologie végétale (sciences végétales, sylviculture, mycologie...), http://aims.fao.org/aos/agrovoc/c_5954, http://aims.fao.org/aos/agrovoc/c_7979, Sciences du vivant, forest precipitation, environment/Ecosystems, http://aims.fao.org/aos/agrovoc/c_1373987680230, Tree Height-Diameter Models, Phytobiology (plant sciences, forestry, mycology...), Pantropical, precipitation, Stand‐level variable, [SDV.BV.BOT] Life Sciences [q-bio]/Vegetal Biology/Botanics, http://aims.fao.org/aos/agrovoc/c_24904, [SDV.BID.SPT] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy, Forest, stand‐, Ecologie [végétale], Crown allometry, anatomie végétale, tropical biomes, Allometry, FOS: Clinical medicine, http://aims.fao.org/aos/agrovoc/c_16172, savanna, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, SIZE, stand‐level variable, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, stand-level variable, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Crown (dentistry), Environmental Sciences
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