@Article{SilvaFGNMFASDLL:2021:InBaDo,
author = "Silva, Sonaira Souza da and Fearnside, Philip Martin and
Gra{\c{c}}a, Paulo Maur{\'{\i}}cio Lima de Alencastro and
Numata, Izaya and Melo, Antonio Willian Flores de and Ferreira,
Evandro Linhares and Arag{\~a}o, Luiz Eduardo Oliveira e Cruz de
and Santos, Edneia Ara{\'u}jo and Dias, Maury S{\'e}rgio and
Lima, Rodrigo Cunha and Lima, Pedro Raimundo Ferreira",
affiliation = "{Universidade Federal do Acre (UFAC)} and {Instituto Nacional de
Pesquisas da Amaz{\^o}nia (INPA)} and {Instituto Nacional de
Pesquisas da Amaz{\^o}nia (INPA)} and {South Dakota State
University (SDSU)} and {Universidade Federal do Acre (UFAC)} and
{Instituto Nacional de Pesquisas da Amaz{\^o}nia (INPA)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Federal do Acre (UFAC)} and {Northern Educational
Union (UNINORTE)} and {Northern Educational Union (UNINORTE)} and
{Universidade Federal do Acre (UFAC)}",
title = "Increasing bamboo dominance in southwestern Amazon forests
following intensification of drought-mediated fires",
journal = "Forest Ecology and Management",
year = "2021",
volume = "490",
pages = "e119139",
month = "June",
keywords = "Forest fires, Droughts, Forest degradation, Bamboo, Guadua.",
abstract = "Since the late 1980s the Amazon rainforest has been affected by
major forest fires every 35 years, mainly in the southwestern
portion of the region. Besides the reduction of forest biomass and
changes in structure and floristic composition, these forest fires
favor the expansion of bamboo in forests in the southwestern
Amazon. However, we know little about the impact of fire on bamboo
expansion and changes in forest structure. The goal of this study
is to quantify forest degradation by fire in areas with bamboo in
the eastern portion of the state of Acre, Brazil, based upon a
combination of forest-inventory and satellite remote-sensing data.
The forest fires were defined by remote sensing as those in which
the crowns of the trees were directly or indirectly affected by
fire to the point that they cause a detectable impact on the
optical satellite images in the 19842016 period. We measured trees
and bamboo in 6 ha distributed in twelve 0.5-ha plots (100 m × 50
m) in unburned forest, forest burned in 2005, burned forest in
2010 and forest burned in both 2005 and 2010. Our results show
change in the structure of the forest with a reduction in the
number of live trees as the number of bamboo culms increases after
the forest fires. The amount of breakage and damage to the trees
by the bamboo culms can double or triple with the expansion of the
bamboo after fire impact. Bamboo expansion was identified based on
an increase of the proportion of pixels with near-infrared channel
reflectance values > 3500. The impact of forest fires resulted in
incursion and dominance of bamboo culms over an area of 120,000
ha, changing the forest type of this area to bamboo-dominated
forest. Our results clearly show that drought-induced forest fires
with anthropogenic sources are capable of shifting the structure
of forest in southwestern Amazonia towards bamboo-dominated
forest. With future climate scenarios indicating more frequent and
extensive droughts due to global warming, which, together with the
use of fire for new deforestation and for managing pasture and
agricultural fields, can be expected to cause more forests in
southwestern Amazonia to be exposed to extensive fires and
potential increase in bamboo density.",
doi = "10.1016/j.foreco.2021.119139",
url = "http://dx.doi.org/10.1016/j.foreco.2021.119139",
issn = "0378-1127",
language = "en",
targetfile = "silva_increasing.pdf",
urlaccessdate = "03 jun. 2024"
}