Caracterização física, estrutural e da diversidade floristica de fragmentos florestais na alta bacia do Rio Araguaia
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Data
2008-03-25
Autores
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Universidade Federal de Goiás
Resumo
The upper Araguaia river basin region has been transformed by rapid and
intensive human occupation processes that began in the 1970s, and now the
landscape is highly fragmented. Remnant forests are surrounded by cotton and
soybean plantations and pasture. They continue to be subjected to degradation and
little is known about their ecological integrity. The objective of this research is
increase knowledge of the remnant forest flora and provide support for public
conservation and recovery policies for these remnant forests. This research consists
of four chapters. The first chapter assessed fragmentation patterns under the
assumption that intensive land occupation and agriculture compromised landscape
structure and forest conservation in the basin. The second chapter assessed whether
remnant forest tree size class structure differed from undegraded forests. The third
chapter investigated whether forest remnants situated in close proximity to Emas
National Park and incorporated into The Emas-Pantanal Biodiversity Corridor had
higher species diversity than other remnants. The fourth chapter showed that species
diversity was correlated with and vegetation indices obtained from satellite images,
due to the indices sensitivity to changes in vegetation structure. These indices could
be used in the future to highlight priority areas for conservation and in devising
recovery policies. The major conclusions of this research are that the ecological
integrity of remnant forests in the Upper Araguaia River Basin is compromised,
predominantly due to lack of connectivity between the fragments and continuing
exposure to degradation processes including tree felling and cattle grazing. Tree
species diversity is high in these fragments, however, and species composition is
dominated by small diameter early successional species. This research also
established that vegetation indices obtained from satellite images, is a powerful tool
in remnant forest species diversity modelling and can be used as a tool for
environmental planning in areas under strong antropic pressure. This information is
relevant to other degraded river basins in the Cerrado region. This research
contributes to improved knowledge of the rich diversity of Brazilian forests and
recognition that this diversity is threatened, particularly in the Upper Araguaia River
basin, southwest of Goias State.
Descrição
Palavras-chave
métricas da paisagem , estrutura diamétrica , descritores de
conservação , fitossociologia , sensoriamento remoto , landscape metrics , diametric structure , conservation descriptors , fitossociology , remote sensing , 1. Diversidade florística Araguaia, Rio, Bacia Goiás
(Estado) 2. Fragmentos florestais 3. Paisagem Proteção 4. Fragmentação
5. Comunidades vegetais 6. Ecologia vegetal 7. Sensoriamento
remoto
Citação
CABACINHA, Christian Dias. Physical, structural and floristic diversity of
forest fragments in the upper basin of the Rio Araguaia. 2008. 116 f. Tese (Doutorado em Ciências Agrárias) - Universidade Federal de Goiás, Goiânia, 2008.