@PhDThesis{Cordeiro:2016:AnCoVe,
author = "Cordeiro, Carlos Leandro de Oliveira",
title = "An{\'a}lise da cobertura vegetal no megaleque Viru{\'a}, norte
da Amaz{\^o}nia",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2016",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2016-03-29",
keywords = "megaleque, campinarana, Amaz{\^o}nia, processos sedimentares,
megafan, Amazonia, depositional processes.",
abstract = "A maior parte das campinaranas amaz{\^o}nicas est{\'a}
concentrada no Pantanal Setentrional, que corresponde a uma bacia
sedimentar quatern{\'a}ria do interfl{\'u}vio dos rios Negro e
Branco. Estudos recentes registraram a associa{\c{c}}{\~a}o
dessa vegeta{\c{c}}{\~a}o com dep{\'o}sitos sedimentares de
sistemas de megaleques. O megaleque mais investigado at{\'e} o
momento {\'e} o do Viru{\'a}, situado na margem esquerda do rio
Branco, sudeste de Roraima. O objetivo principal desta tese foi
avaliar como a forma{\c{c}}{\~a}o do megaleque Viru{\'a}
influenciou na distribui{\c{c}}{\~a}o da biodiversidade
florestal. Os objetivos espec{\'{\i}}ficos foram: mapear em
detalhe o mosaico ambiental da {\'a}rea de estudo com
t{\'e}cnica de classifica{\c{c}}{\~a}o orientada a objeto
(OBIA) e minera{\c{c}}{\~a}o de dados (MD); avaliar a
influ{\^e}ncia do megaleque na diversidade local e regional com
base em invent{\'a}rios de campo e dados de sensoriamento remoto;
avaliar o potencial de dados LiDAR port{\'a}til terrestre nas
estimativas de par{\^a}metros fitoestruturais de campinaranas
florestadas; e integrar t{\'e}cnicas de sensoriamento remoto com
dados de is{\'o}topos de carbono no mapeamento de os tipos de
gram{\'{\i}}neas sobre o megaleque. O estudo revelou que os
dados {\'o}ticos e de radar s{\~a}o importantes no mapeamento do
mosaico ambiental de megaleques, possibilitando precis{\~a}o
global de at{\'e} 88\%. O levantamento flor{\'{\i}}stico
mostrou alta diversidade com 362 esp{\'e}cies documentadas.
Por{\'e}m, apenas 3,3\% dessas esp{\'e}cies s{\~a}o
compartilhadas entre o interior e o exterior do megaleque,
indicando que a floresta ombr{\'o}fila do entorno n{\~a}o {\'e}
fonte principal das esp{\'e}cies florestais registradas no
megaleque. O LIDAR port{\'a}til mostrou ser um m{\'e}todo
r{\'a}pido e barato na previs{\~a}o de par{\^a}metros
fitoestruturais de campinaranas, comoaltura de {\'a}rvores,
di{\^a}metro {\`a} altura do peito (DAP) e biomassa. O
mapeamento integrando imagens Landsat e is{\'o}topos de carbono
mostrou dom{\'{\i}}nio de gram{\'{\i}}neas C3 no megaleque. O
contexto geol{\'o}gico e a morfologia do megaleque Viru{\'a}
foram os principais par{\^a}metros para o surgimento e a
manuten{\c{c}}{\~a}o de sua cobertura vegetal de campinaranas.
Os ambientes estressantes impostos por dep{\'o}sitos arenosos
inundados dos megaleques s{\~a}o barreiras para a ocorr{\^e}ncia
de esp{\'e}cies da floresta ombr{\'o}fila, e favorecem a
coloniza{\c{c}}{\~a}o por esp{\'e}cies n{\~a}o comuns na
regi{\~a}o, aumentando a diversidade de esp{\'e}cies.
Internamente aos megaleques, morfologias locais representativas de
subambientes deposicionais, tais como canais, diques, leques de
transbordamento, barras e dunas, explicam a
distribui{\c{c}}{\~a}o dos v{\'a}rios tipos de campinaranas.
ABSTRACT: Most of the Amazonian campinarana is concentrated in the
Pantanal Setentrional, which corresponds to a Quaternary
sedimentary basin in the the interfluve of the Negro and Branco
Rivers. Recent studies recorded the association of this vegetation
with sedimentary depositsrepresentative of a megafansystem. The
megafan currently most investigated so faris the Viru{\'a}
megafan, located atthe left margin of the Branco River, southeast
of the state of Roraima. The main objective of this thesis was to
evaluate how the formation of the Viru{\'a} megafan influenced
the distribution of forest biodiversity. Specific objectives were:
to map in detail the environomental mosaic of the study area
applying object-based image analysis (OBIA) and data mining (DM);
to evaluate the influence of the megafan in the local and regional
diversity based on field inventories and remote sensing data; to
evaluate the potential of terrestrial portable LIDAR system data
on estimatives of vegetation structure parameters of forest
campinaranas; and to integrate remote sensing with carbon isotope
data in order to mapgrassland types onthe megafan. The study
revealed that optical and radar data are important for mapping the
environmental mosaic of megafans, enabling overall accuracy of up
to 88\%. The floristic survey showed high diversity, with 362
species being documented. However, only 3.3\% arespecies shared
between the inner and pouter megafan, indicating that the
ombrophilous forest is not the main source of the forest species
recorded in the megafan. The portable LIDAR proved to be a quick
and inexpensive method in predicting vegetation structure
parameters of campinarana vegetation, such astree height, diameter
at breast height (DBH) and biomass. Mapping integrating Landsat
images and carbon isotopes showed domain of C3 grasses in megafan.
The geological and morphological contexts of the Viru{\'a}
megafan were main parameters for establishment and maintenance of
of its campinarana vegetation cover. The stressful environments
imposed by the megafan flooded sandy deposits constitute barriers
to the occurrence of ombrophilous forest species, and favor
colonization by species not common in the region, increasing
species diversity. Internally to megafans, local morphologies
representative of depositional sub-environments, such as channels,
dikes, overbank sand sheets, bars and dunes, explain the
distribution of various campinarana types.",
committee = "Rossetti, Dilce de F{\'a}tima (presidente/orientadora) and
Galv{\~a}o, L{\^e}nio Soares and Santos, Jo{\~a}o Roberto dos
and Gribel, Rog{\'e}rio and Almeida, Teodoro Isnard Ribeiro de",
copyholder = "SID/SCD",
englishtitle = "Vegetation cover analysis in the Viru{\'a} megafan (north of
Amazonia)",
language = "pt",
pages = "175",
ibi = "8JMKD3MGP3W34P/3L9BU6B",
url = "http://urlib.net/ibi/8JMKD3MGP3W34P/3L9BU6B",
targetfile = "publicacao.pdf",
urlaccessdate = "27 abr. 2024"
}