@Article{SmithSTFORCWSAFCOAFMHS:2019:SeDrCh,
author = "Smith, Marielle N. and Stark, Scott C. and Taylor, Tyeen C. and
Ferreira, Mauricio L. and Oliveira, Eronaldo and Restrepo-Coupe,
Natalia and Chen, Shuli and Woodcock, Tara and Santos, Darlisson
Bentes dos and Alves, Luciana F. and Figueira, Michela and
Camargo, Plinio B. de and Oliveira, Raimundo C. de and
Arag{\~a}o, Luiz Eduardo Oliveira e Cruz de and Falk, Donald A.
and McMahon, Sean M. and Huxman, Travis E. and Saleska, Scott R.",
affiliation = "{Michigan State University} and {Michigan State University} and
{University of Arizona} and {Universidade de S{\~a}o Paulo (USP)}
and {Universidade Federal do Oeste do Par{\'a} (UFOPA)} and
{University of Arizona} and {University of Arizona} and
{University of Arizona} and {Centro Universt{\'a}rio Luterano
Santarem (CEULS ULBRA)} and {University of California Los Angeles}
and {Universidade Federal do Oeste do Par{\'a} (UFOPA)} and
{Universidade de S{\~a}o Paulo (USP)} and {Embrapa Amazonia
Oriental} and {Instituto Nacional de Pesquisas Espaciais (INPE)}
and {University of Arizona} and {Smithsonian Environm Research
Center} and {University of California Irvine} and {University of
Arizona}",
title = "Seasonal and drought-related changes in leaf area profiles depend
on height and light environment in an Amazon forest",
journal = "New Phytologist",
year = "2019",
volume = "222",
number = "3",
pages = "1284--1297",
month = "May",
keywords = "Amazon forest, climate change, El Nino drought, forest canopy
structure, leaf area, LiDAR remote sensing, phenology.",
abstract = "Seasonal dynamics in the vertical distribution of leaf area index
(LAI) may impact the seasonality of forest productivity in
Amazonian forests. However, until recently, fine-scale
observations critical to revealing ecological mechanisms
underlying these changes have been lacking. To investigate
fine-scale variation in leaf area with seasonality and drought we
conducted monthly ground-based LiDAR surveys over 4 yr at an
Amazon forest site. We analysed temporal changes in vertically
structured LAI along axes of both canopy height and light
environments. Upper canopy LAI increased during the dry season,
whereas lower canopy LAI decreased. The low canopy decrease was
driven by highly illuminated leaves of smaller trees in gaps. By
contrast, understory LAI increased concurrently with the upper
canopy. Hence, tree phenological strategies were stratified by
height and light environments. Trends were amplified during a
2015-2016 severe El Nino drought. Leaf area low in the canopy
exhibited behaviour consistent with water limitation. Leaf loss
from short trees in high light during drought may be associated
with strategies to tolerate limited access to deep soil water and
stressful leaf environments. Vertically and environmentally
structured phenological processes suggest a critical role of
canopy structural heterogeneity in seasonal changes in Amazon
ecosystem function.",
doi = "10.1111/nph.15726",
url = "http://dx.doi.org/10.1111/nph.15726",
issn = "0028-646X",
label = "isi 2019-05-24 SmithSTFORCWSAFCOAFMHS:2019:SeDrCh",
language = "en",
targetfile = "Smith_et_al-2019-New_Phytologist.pdf",
urlaccessdate = "27 abr. 2024"
}