Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1120215
Título: Variations in Amazonian forest canopy structure and light environments across environmental and disturbance gradients.
Autoria: SMITH, M. N.
SCHITTI, J.
GONÇALVES, N.
MINOR, D.
ALMEIDA, D. R. A. de
ROCHA, D. G.
ARAGÓN, S.
MENIN, M.
GUEDES, M. C.
TONINI, H.
SILVA, K. E. da
ROSA, D. M.
NELSON, B. W.
CORDEIRO, C. L. O.
OLIVEIRA JUNIOR, R. C. de
SHAO, G.
SOUZA, M. S.
MCMAHON, S.
ALMEIDA, D.
ARAGÃO, L. E. O. C.
LIMA, N. Z. de
OLIVEIRA, G. de
ASSIS, R. L. de
CAMARGO, J. L.
MESQUITA, R. G.
SALESKA, S. R.
BRESHEARS, D. D.
COSTA, F. R. C.
STARK, S. C.
Afiliação: MARIELLE NATASHA SMITH, Michigan State University
JULIANA SCHITTI, INPA
NATHAN GONÇALVES, Michigan State University
DAVID MINOR, University of Maryland College Park
DANILO ROBERTI ALVES DE ALMEIDA, USP/ESALQ
DANIEL GOMES ROCHA, INPA
SUSAN ARAGÓN, UFOPA
MARCELO MENIN, UFAM
MARCELINO CARNEIRO GUEDES, CPAF-AP
HELIO TONINI, CPPSUL
KATIA EMIDIO DA SILVA, CPAA
DIOGO MARTINS ROSA, INPA
BRUCE W NELSON, INPA
CARLOS LEANDRO OLIVEIRA CORDEIRO, IIS
RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU
GANG SHAO, Michigan State University
MENDELL S. SOUZA, UFOPA
SEAN MCMAHON, Smithsonian Environmental Research Center (SERC)
DANIEL ALMEIDA, UFOPA
LUIZ E. O. C. ARAGÃO, INPE
NICOLAS ZASLAVSKY DE LIMA, UFOPA
GABRIELA DE OLIVEIRA, University of Kansas
RAFAEL LEANDRO DE ASSIS, INPA
JOSÉ L. CAMARGO, INPA
RITA G MESQUITA, INPA
SCOTT R SALESKA, University of Arizona
DAVID D. BRESHEARS, University of Arizona
FLAVIA REGINA CAPELLOTTO COSTA, INPA
SCOTT C. STARK, Michigan State University.
Ano de publicação: 2019
Referência: In: AGU FALL MEETING, 2019, San Francisco. Anais... San Francisco: AGU, 2019.
Conteúdo: A critical problem in tropical forest ecology is understanding how vegetation structure and function vary over environmental gradients. The degree to which forest structure changes across the Amazon basin and the role of environmental variability in shaping forest structure and dynamics are poorly characterised, despite the importance of these forests for regional and global climate. To address these challenges, we connected 10 years of investigations to amass a large database of ground-based profiling canopy lidar (PCL) data from 297 Amazon forest plots across large-scale environmental and disturbance gradients. Mean annual precipitation varied from 1,963 to 3,159 mm, number of dry season months from 0 to 5, and plot soil types covered about half of the variation in phosphorus, exchangeable cation, and soil physical property values observed in Amazonia. We quantified detailed metrics of vertical and horizontal structure and canopy light environments. Forest structure varied considerably across plots; maximum canopy height ranged from 6.1 to 35.7 m, gap fraction from 0.00 to 0.36, LAI from 0.5 to 7.3, rugosity from 1.5 to 7.5 m, and the relative height of 50% light transmission from 0.3 to 0.8. Disturbed sites exhibited almost twice the level of variation (SD) to non-disturbed sites for many metrics. Vertical leaf area density (LAD) profiles also showed high between plot variability, especially at low and high relative canopy heights. Plots with similar LAD profiles sometimes exhibited different distributions of ?canopy photic environment layers??where canopy leaf area is separated into photic environment layers by depth from canopy surface. This demonstrates that LAD profiles alone are insufficient for characterising canopy environments, essential to light-driven regeneration and carbon cycle processes. In addition, we evaluated relationships between lidar metrics and environmental variables extracted from geospatial layers. Our dataset allows a unique and detailed multi-site analysis of canopy structure and environments across the Amazon, including regions with little or no lidar sampling. Examining how structural attributes alter across environmental gradients is critical to understanding how current and future climate influences Amazonian forest structure, function, and dynamics.
Thesagro: Ecologia Florestal
Floresta Tropical
Climatologia
NAL Thesaurus: Forest ecology
Tropical forests
Climatology
Notas: Paper 499657.
Tipo do material: Resumo em anais e proceedings
Acesso: openAccess
Aparece nas coleções:Resumo em anais de congresso (CPAF-AP)

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