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Monitoring heat waves and their impacts on summer crop development in southern Brazil

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Monitoring heat waves and their impacts on summer crop development in southern Brazil

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Título Monitoring heat waves and their impacts on summer crop development in southern Brazil
Autor Gusso, Aníbal
Ducati, Jorge Ricardo
Veronez, Maurício Roberto
Sommer, Victor
Silveira Junior, Luiz Gonzaga da
Abstract Periods in the soybean summer cycle that are sensitive to the occurrence of high temperatures were studied. An analysis was performed on the variability of soybean yields associated with crop canopy temperatures during key development periods. A land surface temperature (LST) data series from MODIS (Moderate Resolution Imaging Spectroradiometer) on the Aqua satellite was processed between 2003 and 2012 that covered the entire state of Rio Grande do Sul, in Brazil. Enhanced vegetation index (EVI) data from MODIS on the Terra satellite were used to monitor the LST during different phenological stages. Spatially interpolated maps of soybean yield distributions were generated using data obtained from Instituto Brasileiro de Geografia e Estatística (IBGE) at state and municipality levels. The results indicate that canopy-LST occurrence in mid-February, during the grain filling, is most correlated to yield reduction (R2 = 0.82 and RMSD = 14.4%). At the state level, the average yield is 2003 kg∙ha−1 with a standard deviation of 308 kg∙ha−1. The overall average of the canopy-LST is 305.0 K (31.8˚C) with a standard deviation of 1.9 K. The slope of the downward linear relationship between canopy-LST and yield was −28.7%. These results indicate that monitoring heat wave events can provide important information for characterising agriculture vulnerability.
Contido em Agricultural sciences. Irvine. Vol. 5, n. 4 (Mar. 2014), p. 353-364
Assunto Imagens de satelite
Produtividade agricola
Rio Grande do Sul
Sensoriamento remoto
Soja
Temperatura do ar
[en] Canopy
[en] Land surface temperature
[en] MODIS Data
[en] Remote sensing
[en] Soybean
[en] Vegetation Index
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/97117
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