Análise da degradação da caatinga no núcleo de desertificação do Seridó (RN/PB)

Costa, T. C. e C. da; Oliveira, Maria Aparecida José de; Accioly, L. J. de O.; Silva, Flávio H. B. B. da

doi:10.1590/s1415-43662009000700020

Cited by 47 publications

(38 citation statements)

References 25 publications

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“…It is a heterogeneous environment and has been devastated by natural events and human actions (Costa et al 2009). As an example of human threat in Caatinga, we can mention the frequent use of Published: 25 December 2015 its natural resources, by local rural populations (Oliveira et al 2012), which in many cases do not respect the recovery dynamics of this biome.…”

Section: Introductionmentioning

confidence: 99%

Ecological Apparency Hypothesis and Plant Utility in the Semiarid Region of Brazil

Guerra

Carvalho

Ribeiro

et al. 2015

Ethnobot. Res. App.

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The ecological apparency hypothesis seeks to understand the dynamics of use that a particular species has through its availability in vegetation areas. According to this hypothesis, apparent plants are the most collected and used by humans. This hypothesis was tested in the rural community of Santa Rita, municipality of Congo, in Cariri microregion (Paraíba state, Northeast Brazil). We calculated the use value (UV) for each species. For the phytosociological inventory, we adopted the point-quadrant method, plotting 500 points distributed in the vegetation areas of the community, registering the perimeter measurements and height of 2000 plants. Interviews were conducted with householders, totaling 98 informants (41 men and 57 women), and 24 species, 21 genera, and 11 families were recorded. The cited species were grouped into 11 utility categories. The Spearman correlation coefficient was used to correlate phytosociological and ethnobotanical data. The use values of the species did not correlate with phytosociological parameters. Regarding the use categories, there were positive correlations for fuel (UV with dominance and basal area), construction (UV with all phytosociological parameters), fodder (UV with all parameters), and poison/abortion categories (UV with density and frequency). Ecological apparency significantly explained the local importance of useful plants in fuel, construction, and fodder categories, and less significantly for poison/abortion.

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Section: Introductionmentioning

confidence: 99%

Ecological Apparency Hypothesis and Plant Utility in the Semiarid Region of Brazil

Guerra

Carvalho

Ribeiro

et al. 2015

Ethnobot. Res. App.

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“…Studies on vegetation changes (including land degradation issues) in NEB were conducted on different spatial scales. Local to small regional scale studies (< 4000 km 2 ) applied, e.g., floristic and phytosociological inventories [da Costa et al, 2009], and SPOT images in combination with field work [Costa Filho et al, 2008], Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM) imagery [Petta et al, 2005;Almeida-Filho and Carvalho, 2010]. Barbosa et al [2006] analysed vegetation trends for NEB by calculating standardized anomalies of monthly NDVI values (regional mean values of all pixels within NEB).…”

Section: Introductionmentioning

confidence: 99%

“…Although the comparison of NDVI and precipitation trends should be further expanded, these short considerations suggest that precipitation changes alone do not sufficiently explain the vegetation trends. Land use changes and land degradation are important issues in the study area [Petta et al, 2005;MMA, 2007;Simielli, 2007;Costa Filho et al, 2008;da Costa et al, 2009;Boori and Amaro, 2010] and may lead to abrupt or gradual vegetation changes. However, the evaluation of land use changes and land degradation needs further information -especially ground truth data -than just coarse and moderate resolution NDVI data.…”

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confidence: 99%

Assessing vegetation variability and trends in north-eastern Brazil using AVHRR and MODIS NDVI time series

Schucknecht

Erasmi

Niemeyer

et al. 2013

European Journal of Remote Sensing

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Desertification is a challenge in north-eastern Brazil (NEB) that needs to be understood to develop sustainable land-use strategies. This study analyses regional vegetation dynamics in NEB and the compatibility of two NDVI data sets to support future desertification assessment studies in the semi-arid Caatinga biome. Vegetation variability and trends in NEB are analysed for 1982-2006, based on monthly AVHRR (GIMMS) NDVI data. The GIMMS data are compared with MODIS NDVI for the overlapping period [2001][2002][2003][2004][2005][2006]. Existing statistical methods are applied and existing NDVI analyses in NEB expanded in respect to vegetation trend analysis and data set comparison.

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“…Por outro lado, a quantidade estimada de biomassa por hectare foi superior aos valores encontrados por Costa et al (2009), que quantificaram a biomassa aérea em duas microrregiões do semiárido do Rio Grande do Norte, onde o valor médio de biomassa foi cerca de 9 t.ha -1 .…”

Section: Resultsunclassified

Viabilidade Econômica do Uso Energético de Lenha da Caatinga sob Manejo Sustentável (Economic Viability of the Energetic Use of the Wood from Caatinga Under Sustainable Forest Management)

Júnior

Lima

Liberal³

et al. 2015

Rev. Bras. Geog. Fis.

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. 5 Prof. Dr. da UFPE, Programa de Pós-Graduação em Tecnologias Energéticas e Nucleares -PROTEN, Recife, Pernambuco, Brasil, esampaio@ufpe.br; 6 Prof. Dr. da UFPE-PROTEN, Recife, Pernambuco, Brasil, rmenezes@ufpe.br.Artigo submetido em 04/02/2015 e aceito em 25/03/2015 R E S U M O Com o objetivo de avaliar a viabilidade econômica de aproveitamento energético da lenha de Caatinga sob manejo florestal sustentável foi feita uma análise econômica considerando o aproveitamento da lenha em diferentes rotas tecnológicas: comercialização direta da lenha (1), produção de carvão por fornos tradicionais (2) e por fornos cilíndricos (3), e a produção de energia em termelétricas com ciclo a vapor com turbinas de condensação (4) e ciclo combinado integrado a gaseificação da biomassa (5). Na análise econômica foram incluídos para cada rota os custos com: compra da área, implantação de manejo florestal sustentável, equipamentos e manutenção, tributos e impostos, valor presente líquido, taxa mínima de atratividade, período de retorno de investimento e taxa interna de retorno. As rotas de produção de carvão apresentaram maior viabilidade econômica, com o prazo de retorno de investimento variando de 2,4 anos (fornos cilíndricos) a 3 anos (fornos tradicionais). A análise de sensibilidade mostrou que é possível tornar as rotas de comercialização direta da lenha e de uso da lenha para geração de energia em termelétricas , com o aumento dos parâmetros: produtividade de lenha, preço de energia e preço de lenha, ou com a diminuição do custo de investimento inicial ou do preço da terra. Palavras-chave: biomassa, carvão vegetal, geração termelétrica. Economic Viability of the Energetic Use of the Wood from Caatinga Under Sustainable Forest Management A B S T R A C TAiming to evaluate the economic viability of energetic use of the wood from Caatinga under sustainable forest management was made an economic analysis considering the use of wood in different technological routes: direct commercialization of wood (1), coal production by traditional furnaces (2) and by cylindrical furnaces (3), production of energy in thermoelectric with steam cycle and condensing turbines (4) and combined cycle integrated the gasification of biomass (5). In economic analysis were included for each route costs with: purchase of the area, implementation of sustainable forest management, equipment and maintenance, tributes and taxes, current net value, minimum rate of the attractiveness, payback period of investment and internal rate of return. Routes coal production presented greater economic viability, with the investment payback period ranging from 2.4 years (cylindrical furnaces) and three years (traditional furnaces). Sensitivity analysis showed that it is possible make direct commercialization routes of wood and use of wood for energy generation in thermoelectric with increased wood productivity parameters : fuel productivity, price of the energy and fuel, or decrease in the cost of initial investment or of the price of land.

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Análise da degradação da caatinga no núcleo de desertificação do Seridó (RN/PB)

Cited by 47 publications

References 25 publications

Ecological Apparency Hypothesis and Plant Utility in the Semiarid Region of Brazil

Ecological Apparency Hypothesis and Plant Utility in the Semiarid Region of Brazil

Assessing vegetation variability and trends in north-eastern Brazil using AVHRR and MODIS NDVI time series

Viabilidade Econômica do Uso Energético de Lenha da Caatinga sob Manejo Sustentável (Economic Viability of the Energetic Use of the Wood from Caatinga Under Sustainable Forest Management)

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