Made available in DSpace on 2015-02-24T20:19:47Z (GMT). No. of bitstreams: 1
SebastiaoCJ_DISSERT.pdf: 3305443 bytes, checksum: 12fd9401dd1cf23c4a8b8b849f63f5d2 (MD5)
Previous issue date: 2011-02-18 / The human interference in the semiarid region of Serid? Potiguar has promoted the increase of degraded areas. The economic dynamic that was established in the Serid? territory, especially after the fall of the trinomial cattle-cotton-mining in the 70s and 80s of the 20th century as pillars of the regional economy, resulted in an accelerated process of erosion of natural resources. The municipalities of the Serid? region have been spatially reordered by this new economic dynamic, marked by the growth of existing enterprises, and the development of new agricultural practices. One of the municipalities in the region that restructured its territorial space with the emergence of new agro-industrial activities was the town of Parelhas. With the demise of the trinomial cattle-cotton-mining in the 1980s, other productive activities were intensified from the 1990s, amongst them, pottery, responsible for the vegetal extraction for use as energy source. This recent economic and spatial restructuring in the region, reflected in the Parelhense municipal territory, required new productive ingredients responsible for the modification of past production relations that were based on cattle, cotton and mining. By that a process of exploring the environment was unleashed, especially the native vegetation, in an uncontrolled manner. In this context, the objective of this study was to survey and detect deforestation in the areas of Caatinga vegetation, used indiscriminately as energy supply for new agricultural practices, using remote sensing techniques based on the quantification of the Normalized Difference Vegetation Index / NDVI, Soil-Adjusted Vegetation Index / SAVI, surface temperature and rainfall data in the years 1990 and 2010. The results indicated that SAVI values above 0.2 in 1990 and 2010 represent the areas with the highest density of vegetation that occur exclusively along the major drainages in the town and areas of higher elevations. The areas between the ranges of values from 0.5 to 0.15 SAVI are areas with poor vegetation. On the other hand the highest values of temperature are distributed in the western and southeastern parts of the township, usually in places where the soil is exposed or there is sparse vegetation. The areas of bare soil decreased in extension in 2010 at 11, 6% when related to 1990, this was caused by a higher rainfall intensity in the first half of 2010, but no regeneration of vegetation occurred in some places in the western and southeastern areas of the municipality today, due to the extraction of firewood to fuel the furnaces of industries in town / A interfer?ncia antr?pica na regi?o Semi?rida do Serid? Potiguar vem desencadeando o aumento de ?reas degradadas. A din?mica econ?mica que se estabeleceu no territ?rio seridoense, sobretudo ap?s a queda do trin?mio gado, algod?o e minera??o nas d?cadas de 70 e nas d?cadas de 80 do s?culo XX, como pilares da economia da regi?o, implicaram num acelerado processo de desgaste dos recursos naturais. Os territ?rios municipais da regi?o do Serid? v?m sendo reordenado espacialmente por essa nova din?mica econ?mica, marcada pelo crescimento dos empreendimentos j? existentes, al?m do desenvolvimento de novas atividades agroindustriais. Um dos munic?pios do Serid? potiguar que teve seu espa?o territorial reestruturado com o surgimento de novas atividades agroindustriais foi o de Parelhas. Com a derrocada do trin?mio gado, algod?o e minera??o, na d?cada de 1980, outras atividades produtivas foram intensificadas a partir da d?cada de 1990, dentre elas a ceramista, respons?vel pela extra??o vegetal para utiliza??o como fonte energ?tica. Essa recente reestrutura??o espacial e econ?mica regional, refletida no territ?rio municipal parelhense, tem requerido novos ingredientes produtivos, respons?veis pela modifica??o das rela??es de produ??o pret?ritas que antes eram baseadas na pecu?ria, no algod?o e na minera??o. Com isso, desencadeou-se um processo de explora??o do meio ambiente, em especial da vegeta??o nativa, de forma descontrolada. Nesse contexto o objetivo deste trabalho foi fazer o levantamento e a detec??o do desmatamento das ?reas de vegeta??o de caatinga, usadas indiscriminadamente para o abastecimento energ?tico das novas atividades agroindustriais, utilizando t?cnicas de sensoriamento remoto a partir da quantifica??o do ?ndice de Vegeta??o Diferen?a Normalizada/NDVI, do ?ndice de Vegeta??o Ajustado ao Solo/SAVI, da temperatura da superf?cie e de dados pluviom?tricos nos anos de 1990 e 2010. Os resultados indicaram que os valores de SAVI acima de 0,2 em 1990 e 2010 representam as ?reas com maior densidade de vegeta??o que ocorrem, exclusivamente, ao longo das drenagens principais do munic?pio e nas ?reas de maiores eleva??es. As ?reas que est?o entre os intervalos de valores de SAVI de 0,5 at? 0,15 s?o ?reas com pouca cobertura vegetal. J? os valores mais altos de temperatura distribuem-se na ?rea oeste e sudeste do munic?pio, geralmente em locais onde o solo est? exposto ou possui vegeta??o pouco densa. As ?reas de solo exposto diminu?ram sua extens?o, em 2010, cerca de 11, 6% quando relacionada a 1990, isto foi ocasionado por uma intensidade pluviom?trica maior no primeiro semestre de 2010, por?m n?o houve regenera??o da vegeta??o em alguns locais nas ?reas Oeste e Sudeste do munic?pio nesta data, devido ? extra??o de lenha para abastecer os fornos das ind?strias do munic?pio
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/18497 |
| Date | 18 February 2011 |
| Creators | Cosme J?nior, Sebasti?o |
| Contributors | CPF:20610700430, http://lattes.cnpq.br/3687987476428917, Cavalcante, Arn?bio de Mendon?a, CPF:22028528320, http://lattes.cnpq.br/7282660743064601, Ara?jo, Paulo C?sar de, CPF:42239893320, http://lattes.cnpq.br/8907561396542319, Silva, Fernando Moreira da |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa Regional de P?s-Gradua??o em Desenvolvimento e Meio Ambiente PRODEMA, UFRN, BR, Meio Ambiente, Cultura e Desenvolvimento |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.0028 seconds