@InProceedings{RibeiroPFSOFKSRA:2018:EfLaUs,
author = "Ribeiro, Kelly and Pacheco, Felipe Siqueira and Ferreira, Willian
Jos{\'e} and Sousa Neto, Eraclito Rodrigues de and Ometto, Jean
Pierre Henry Balbaud and Forti, Maria Cristina and Krieger Filho,
Guenther Carlos and Sobra, Anahi Chimini and Reis, Samara
Ven{\^a}ncio dos and Alval{\'a}, Pl{\'{\i}}nio Carlos",
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)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade de S{\~a}o Paulo (USP)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)}",
title = "Effect of land use and land cover on greenhouse gas emissions from
peatlands in the Para{\'{\i}}ba Valley, Brazil",
year = "2018",
organization = "AGU Fall Meeting",
abstract = "Peatlands cover around 570 million hectares worldwide and although
most are located in boreal environments, tropical peatlands cover
170 million hectares and store about 860 Gt of carbon. Peat soils
store a large amount of carbon and have acted as sinks of
atmospheric CO2 for thousands of years but can also act as major
sources of GHG emissions into the atmosphere when impacted by
anthropogenic activities such as drainage, deforestation, forest
fires, and changes from native to agricultural and livestock
systems. These changes, besides disturbing the functions of this
ecosystem, affect the dynamics of CO2 and CH4 flows. Therefore,
the objective of this study is to evaluate the effect of land use
change and land cover (LULC) on the dynamics of carbon emissions
in tropical peatlands in the Vale do Para{\'{\i}}ba region,
S{\~a}o Paulo, Brazil. The sampling program was carried out in
the lowlands of the Para{\'{\i}}ba do Sul River, over different
land cover: pastureland, native forest and irrigated rice crop. We
used the static chamber technique to estimate GHG fluxes during
two seasonal periods (wet season of 2017 and dry season 2018). Our
results show that the highest CO2 (g CO2 m-2 yr-1) fluxes were
observed in the dry season in pastureland (3,210), followed by
native forest (2,174) and irrigated rice crop (2,074). The higher
values in the dry season was regulated mainly by peat moisture,
organic matter content and groundwater level. The CH4 fluxes (gCH4
m-2 yr-1) were mainly dependent on the moisture, temperature of
the peat and groundwater level. The CH4 fluxes were negative
(uptake) for pastureland (-5.2) and native forest (-3.1) and
positive (emission) for irrigated rice crop (3.1). In the rainy
season, methane fluxes were similar for the three land covers,
with emissions of 4.0, 4.2 and 3.1 gCH4 m-2 yr-1 for native
forest, pastureland and irrigated rice crop, respectively. These
results suggest an increasing trend of CO2 emissions in situations
of higher temperature and deeper groundwater table, mainly driven
by the drainage and deforestation of peatlands in the region. On
the other hand, long-term drought conditions may promote
methanotrophic activities and consumption of CH4, decreasing CH4
emissions. Thus, the role of the peatlands as sink or source of
GHG to the atmosphere will depend mainly on the dynamics of the
LULC changes and land management.",
conference-location = "Washington, D. C.",
conference-year = "10-14 dec.",
language = "en",
targetfile = "ribeiro_effect.pdf",
urlaccessdate = "15 jun. 2024"
}