Atualização de Documento

XIX SBSR

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O sistema de atualização, para eventuais correções, estará ativo até 30/11/2019.

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Tipo de Referência		Artigo em Evento (Conference Proceedings)
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	Não esqueça de clicar na opção "+" para informar os dados dos co-autores, se tiver.		v
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Resumo	(*)(?)	The aim of this study was to discriminate NDVI/MODIS temporal profiles of winter cereals cropping areas in Rio Grande do Sul State in La Niña, El Niño or Neutral years. The data set comprised NDVI/MODIS images, from April to December of the 2000-2012 series. The mean values of NDVI of winter cereals cropping areas, identified by crop masking and unsupervised classification, were used to elaborated temporal profiles of La Niña, El Niño or Neutral years, according to ENSO (El Niño Southern Oscillation) episodes in spring (September-October-November) for NOAA. The results indicated that the mean of NDVI values varied between 0.41 and 0.81, reflecting the differences in sowing period and plant growth in the regions of Caxias do Sul, Passo Fundo and Santa Rosa. The NDVI/MODIS profile of La Niña was distinct in temporal evolution of vegetation index, in comparison to El Niño profile. NDVI/MODIS temporal profile of La Niña has a delay in initial increment and lower values of NDVI during the vegetative stage of winter cereals in Rio Grande do Sul State (June, July, August and September). In the series analyzed, higher grain yields were observed in La Niña years and NDVI temporal profiles indicated the gradual accumulation of green biomass according to lower air temperatures during the cycle of winter cereals in study regions.
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