@Article{SilvaAlvaMaraFerr:2016:AnInPa,
author = "Silva, Marcelo Gomes da and Alval{\'a}, Pl{\'{\i}}nio Carlos
and Marani, Luciano and Ferreira, William Jos{\'e}",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "An{\'a}lise da influ{\^e}ncia de par{\^a}metros ambientais no
fluxo de metano em {\'a}reas alag{\'a}veis e lagoas permanentes
na regi{\~a}o do Rio Abobral, no Pantanal, Brasil",
journal = "Revista Ambiente \& {\'A}gua",
year = "2016",
volume = "11",
number = "2",
pages = "327--338",
keywords = "Environmental chemistry, Environmental indicators, Environmental
sciences, Global changes, ci{\^e}ncias ambientais, indicadores
ambientais, mudan{\c{c}}as globais, qu{\'{\i}}mica ambiental.",
abstract = "This study evaluates the influence of physical and chemical
characteristics of the water column in the processes that result
in methane emissions in the Pantanal. Two surveys were conducted
in 2009 and 2010, corresponding to the drought and flood seasons,
respectively. The CH4 fluxes were determined using the static
chamber technique. Environmental variables, such as depth, water
temperature, pH, redox potential, dissolved oxygen and total
dissolved solids were also measured. Diffusive and bubble flux
presented an average value of 11.1 ± 13.5 mg CH4 m-2 d-1 e 275.9 ±
348.5 mg CH4 m-2 d-1, which is a value near those observed in
other tropical flooded regions. Statistical t-tests have shown
significant differences between drought and flood seasons (p
\≤ 0.05). Diffusive fluxes represented about 87% of the
total fluxes measured in drought. During the flood season there
were more instances of bubble fluxes (77%). Statistical analysis
(correlation and Principal Components Analysis) indicate that
physical and chemical characteristics could affect methane fluxes.
Diffusive fluxes correlated mainly withpH, redox potential and
dissolved oxygen, which is in accordance withthe increase of
organic matter during flooding. Bubble fluxes measured during the
drought season correlated mainly withwater depthand temperature,
pH and redox potential, which is an indication of an environment
to suitable to the formation and liberation of the bubbles from
sediment. © 2016, Institute for Environmental Research in
Hydrographic Basins (IPABHi). RESUMO: Neste estudo foi analisada a
influ{\^e}ncia de caracter{\'{\i}}sticas
f{\'{\i}}sico-qu{\'{\i}}micas da coluna d{\'a}gua nos
processos que resultam na emiss{\~a}o de metano no Pantanal.
Foram realizadas duas campanhas intensivas de coleta de dados
durante os anos de 2009 e 2010, correspondendo aos
per{\'{\i}}odos de seca e cheia. O fluxo de metano foi
determinado usando a t{\'e}cnica de c{\^a}mara est{\'a}tica. Em
cada ponto de coleta foi medida a profundidade, temperatura da
{\'a}gua, pH, potencial de oxirredu{\c{c}}{\~a}o, oxig{\^e}nio
dissolvido e total de s{\'o}lidos dissolvidos. Os fluxos foram
classificados em difusivos e ebulitivos, com m{\'e}dia de 11,1 ±
13,5 mg CH4 m -2 d-1 e 275,9 ± 348,5 mg CH4 m -2 d-1,
respectivamente, que {\'e} um valor pr{\'o}ximo ao observado em
outras regi{\~o}es alagadas tropicais. A aplica{\c{c}}{\~a}o de
teste t mostrou diferen{\c{c}}a estat{\'{\i}}stica
significativa (p \≤ 0,05) entre os dois per{\'{\i}}odos,
com os maiores valores m{\'e}dios ocorrendo na
esta{\c{c}}{\~a}o de cheia. Durante o per{\'{\i}}odo de seca
houve um predom{\'{\i}}nio de fluxos difusivos (83%) em
rela{\c{c}}{\~a}o aos ebulitivos. Na cheia ocorreram mais casos
de fluxo ebulitivo (77%). As an{\'a}lises estat{\'{\i}}sticas
de correla{\c{c}}{\~a}o e An{\'a}lise de Componentes Principais
demostraram que as intera{\c{c}}{\~o}es entre
caracter{\'{\i}}sticas f{\'{\i}}sico-qu{\'{\i}}micas da
{\'a}gua podem influenciar o fluxo de metano. Os fluxos difusivos
apresentaram correla{\c{c}}{\~a}o principalmente com pH,
potencial de oxirredu{\c{c}}{\~a}o e oxig{\^e}nio dissolvido,
que est{\~a}o de acordo com o aumento de mat{\'e}ria
org{\^a}nica durante o alagamento do Pantanal. Fluxos ebulitivos
no per{\'{\i}}odo da seca tiveram influ{\^e}ncia da
profundidade, temperatura da {\'a}gua, pH e potencial de
oxirredu{\c{c}}{\~a}o que indicam que o ambiente foi
prop{\'{\i}}cio para a forma{\c{c}}{\~a}o de bolhas ou para
sua libera{\c{c}}{\~a}o do sedimento.",
doi = "10.4136/ambi-agua.1775",
url = "http://dx.doi.org/10.4136/ambi-agua.1775",
issn = "1980-993X",
language = "pt",
targetfile = "silva_analise.pdf",
urlaccessdate = "15 jun. 2024"
}