@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 = "27 abr. 2024"
}