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@Article{AquinoRocMorTeiAnd:2018:UsReSe,
               author = "Aquino, Deodato do Nascimento and Rocha Neto, Od{\'{\i}}lio 
                         Coimbra da and Moreira, Maur{\'{\i}}cio Alves and Teixeira, 
                         Adunias dos Santos and Andrade, Eunice Maia de",
          affiliation = "{Instituto Nacional de Coloniza{\c{c}}{\~a}o e Reforma 
                         Agr{\'a}ria (INCRA)} and {Universidade Federal do Cear{\'a} 
                         (UFC)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal do Cear{\'a} (UFC)} and {Universidade 
                         Federal do Cear{\'a} (UFC)}",
                title = "Use of remote sensing to identify areas at risk of degradation in 
                         the semi-arid region",
              journal = "Revista Ci{\^e}ncia Agron{\^o}mica",
                 year = "2018",
               volume = "49",
               number = "3",
                pages = "420--429",
                month = "jul./set.",
             keywords = "NDVI. Caatinga. Landsat TM5. Desertification, NDVI. Caatinga. 
                         Landsat TM5. Desertifica{\c{c}}{\~a}o.",
             abstract = "One of the most effective procedures in the evaluation of degraded 
                         areas has been the use of remote sensing. The aim of this work was 
                         to evaluate the temporal dynamics of the NDVI and rainfall in 
                         detecting the degradation of natural resources in a semi-arid 
                         region of Brazil. The area under study is located to the west of 
                         the district of Tau{\'a}, in the State of Cear{\'a}, with a 
                         predominance of shrub-like caatinga forest. Rainfall data was 
                         obtained from FUNCEME. Ten images (dry season) were acquired from 
                         a 27-year historical series (1985-2011) from the TM/LANDSAT5 
                         sensor, later converted to surface reflectance using the 
                         FLAASH/ENVI extension; NDVI indices were obtained and divided into 
                         six classes corresponding to land usage and occupation. The mean 
                         values of the NDVI classes were submitted to statistical analysis 
                         and compared by T-test (p<0.05) and the Pearson correlation 
                         matrix. It was found that in the years with rainfall above the 
                         historical average (1985-1993 and 1996- 2004) there was a 
                         significant increase in degraded areas, represented by low values 
                         for the NDVI (between 0 and 0.4), due to more land being used for 
                         subsistence farming. However, during periods of drought (1993-1996 
                         and 2004-2011), the opposite behaviour was seen, characterised by 
                         the natural regeneration of the woody stratum due to agricultural 
                         areas being abandoned; behaviour that was evidenced by increases 
                         of up to 1,807% in the moderately high class of the NDVI (between 
                         0.6 and 0.8). The spatial and temporal dynamics of the NDVI and 
                         the rainfall therefore played a part in detecting evidence of the 
                         process of degradation of the caatinga biome in an area of the 
                         district of Tau{\'a}, in the State of Cear{\'a}. RESUMO: Um dos 
                         procedimentos mais eficazes na avalia{\c{c}}{\~a}o de {\'a}reas 
                         degradadas tem sido o uso do sensoriamento remoto. Este trabalho 
                         objetivou avaliar a din{\^a}mica temporal do NDVI e da 
                         precipita{\c{c}}{\~a}o pluviom{\'e}trica na 
                         detec{\c{c}}{\~a}o de degrada{\c{c}}{\~a}o dos recursos 
                         naturais em uma regi{\~a}o semi{\'a}rida do Brasil. A {\'a}rea 
                         estudada localiza-se a oeste do munic{\'{\i}}pio de Tau{\'a}, 
                         estado do Cear{\'a}, com predom{\'{\i}}nio de floresta caatinga 
                         arbustiva. As informa{\c{c}}{\~o}es de precipita{\c{c}}{\~a}o 
                         foram obtidas junto {\`a} FUNCEME. Foram adquiridas 10 imagens 
                         (esta{\c{c}}{\~a}o seca) de uma s{\'e}rie hist{\'o}rica de 27 
                         anos (1985-2011) do sensor TM/LANDSAT5, posteriormente convertidas 
                         em reflect{\^a}ncia de superf{\'{\i}}cie por meio da 
                         extens{\~a}o FLAASH/ENVI e obtidas os {\'{\i}}ndices NDVI, 
                         segmentados em 6 classes conforme o uso e ocupa{\c{c}}{\~a}o do 
                         solo. Os valores m{\'e}dios das classes de NDVI foram submetidos 
                         {\`a} an{\'a}lise estat{\'{\i}}stica e confrontados pelo Teste 
                         T (p<0,05) e matriz de correla{\c{c}}{\~a}o de Pearson. 
                         Observou-se que nos anos com precipita{\c{c}}{\~a}o 
                         pluviom{\'e}trica acima da m{\'e}dia hist{\'o}rica (1985-1993 e 
                         1996-2004) houve significativo acr{\'e}scimo de {\'a}reas 
                         degradas representadas por baixo NDVI (entre 0 e 0,4), decorrentes 
                         do avan{\c{c}}o de terras incorporadas {\`a} agricultura de 
                         subsist{\^e}ncia. No entanto, em per{\'{\i}}odos de estiagem 
                         (1993-1996 e 2004-2011), constatou-se comportamento inverso, 
                         caracterizado pela regenera{\c{c}}{\~a}o natural do estrato 
                         arbustivo-arb{\'o}reo em decorr{\^e}ncia do abandono das 
                         {\'a}reas agr{\'{\i}}colas, comportamento evidenciado por 
                         incrementos de at{\'e} 1.807% da classe de NDVI moderadamente 
                         alta (entre 0,6 e 0,8). Portanto, a din{\^a}mica 
                         espa{\c{c}}o-temporal do NDVI e da precipita{\c{c}}{\~a}o 
                         pluviom{\'e}trica contribu{\'{\i}}ram para detec{\c{c}}{\~a}o 
                         de evid{\^e}ncias do processo de degrada{\c{c}}{\~a}o do bioma 
                         caatinga numa {\'a}rea no munic{\'{\i}}pio de Tau{\'a}, estado 
                         do Cear{\'a}.",
                  doi = "10.5935/1806-6690.20180047",
                  url = "http://dx.doi.org/10.5935/1806-6690.20180047",
                 issn = "0045-6888",
             language = "en",
           targetfile = "aquino_use.pdf",
        urlaccessdate = "30 nov. 2020"
}


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