@Article{WitheyBPELSAFFMRB:2018:QuImCa,
author = "Withey, Kieran and Berenguer, Erika and Palmeira, Alessandro
Ferraz and Espirito Santo, Fernando D. B. and Lennox, Gareth D.
and Silva, Camila V. J. and Arag{\~a}o, Luiz Eduardo Oliveira e
Cruz de and Ferreira, Joice and Fran{\c{c}}a, Filipe and Malhi,
Yadvinder and Rossi, Liana Chesini and Barlow, Jos",
affiliation = "{Lancaster University} and {Lancaster University} and
{Universidade Federal do Par{\'a} (UFPA)} and {University of
Leiceste} and {Lancaster University} and {Lancaster University}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Embrapa Amaz{\^o}nia Oriental} and {Lancaster University} and
{University of Oxford} and {Universidade Estadual Paulista
(UNESP)} and {Lancaster University}",
title = "Quantifying immediate carbon emissions from El Niño-mediated
wildfires in humid tropical forests",
journal = "Philosophical Transactions of the Royal Society B: Biological
Sciences",
year = "2018",
volume = "373",
number = "1760",
month = "Oct.",
keywords = "ENSO, forest degradation, climate change, necromass, drought,
Amazon.",
abstract = "Wildfires produce substantial CO2 emissions in the humid tropics
during El Niño-mediated extreme droughts, and these emissions are
expected to increase in coming decades. Immediate carbon emissions
from uncontrolled wildfires in human-modified tropical forests can
be considerable owing to high necromass fuel loads. Yet, data on
necromass combustion during wildfires are severely lacking. Here,
we evaluated necromass carbon stocks before and after the
2015-2016 El Niño in Amazonian forests distributed along a
gradient of prior human disturbance. We then used Landsat-derived
burn scars to extrapolate regional immediate wildfire CO2
emissions during the 2015-2016 El Niño. Before the El Niño,
necromass stocks varied significantly with respect to prior
disturbance and were largest in undisturbed primary forests (30.2
± 2.1 Mg ha-1, mean ± s.e.) and smallest in secondary forests
(15.6 ± 3.0 Mg ha-1). However, neither prior disturbance nor our
proxy of fire intensity (median char height) explained necromass
losses due to wildfires. In our 6.5 million hectare (6.5 Mha)
study region, almost 1 Mha of primary (disturbed and undisturbed)
and 20 000 ha of secondary forest burned during the 2015-2016 El
Niño. Covering less than 0.2% of Brazilian Amazonia, these
wildfires resulted in expected immediate CO2 emissions of
approximately 30 Tg, three to four times greater than comparable
estimates from global fire emissions databases. Uncontrolled
understorey wildfires in humid tropical forests during extreme
droughts are a large and poorly quantified source of CO2
emissions.This article is part of a discussion meeting issue 'The
impact of the 2015/2016 El Niño on the terrestrial tropical carbon
cycle: patterns, mechanisms and implications'.",
doi = "10.1098/rstb.2017.0312",
url = "http://dx.doi.org/10.1098/rstb.2017.0312",
issn = "1552-2814",
language = "en",
targetfile = "withey_quantifying.pdf",
urlaccessdate = "27 abr. 2024"
}