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| Johann,Jerry A.; Rocha,Jansle V.; Oliveira,Stanley R. de M.; Rodrigues,Luiz H. A.; Lamparelli,Rubens A. C.. |
| The aim of this study was to group temporal profiles of 10-day composites NDVI product by similarity, which was obtained by the SPOT Vegetation sensor, for municipalities with high soybean production in the state of Paraná, Brazil, in the 2005/2006 cropping season. Data mining is a valuable tool that allows extracting knowledge from a database, identifying valid, new, potentially useful and understandable patterns. Therefore, it was used the methods for clusters generation by means of the algorithms K-Means, MAXVER and DBSCAN, implemented in the WEKA software package. Clusters were created based on the average temporal profiles of NDVI of the 277 municipalities with high soybean production in the state and the best results were found with the K-Means... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annual crop; MODIS; SPOT Vegetation; MAXVER; K-Means. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000300008 |
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| FUJISAKI, K.; PERRIN, A.-S.; DESJARDINS, T.; BERNOUX, M.; BALBINO, L. C.; BROSSARD, M.. |
| Abstract - The impact of deforestation on soil organic carbon (SOC) stocks is important in the context of climate change and agricultural soil use. Trends of SOC stock changes after agroecosystem establishment vary according to the spatial scale considered, and factors explaining these trends may differ sometimes according to meta-analyses. We have reviewed the knowledge about changes in SOC stocks in Amazonia after the establishment of pasture or cropland, sought relationships between observed changes and soil, climatic variables and management practices, and synthesized the ?13C measured in pastures. Our dataset consisted of 21 studies mostly synchronic, across 52 sites (Brazil, Colombia, French Guiana, Suriname), totalling 70 forest?agroecosystem... |
| Tipo: Separatas |
Palavras-chave: Annual crop; Carbon storage; Chronosequence; Grassland; Rainforest; Soil tillage.; Deforestation; Humid tropics; Soil organic matter.. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1036013 |
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| RODIGHERI, G.; FONTANA, D. C.; DALMAGO, G. A.; SCHAPARINI, L. P.; SCHIRMBECK, J.; FERNANDES, J. M. C.. |
| Resumo: A Produtividade Primária Líquida (NPP) pode ser utilizada para quantificar o papel relativo do clima e das atividades humanas na dinâmica da vegetação. Dada sua importância, muitos modelos de estimativa de NPP foram desenvolvidos, mas parte dos dados requeridos, ainda são limitados. Diante disso, este trabalho teve como objetivo estimar a NPP potencial e real testando diferentes abordagens quanto a fonte dos dados e métodos de estimativa, assim como, avaliar a apropriação humana da NPP em uma lavoura de soja cultivada no Sul do Brasil. Para isso, foram obtidos dados de NPP medida a campo em cultivo de soja em Carazinho, no Rio Grande do Sul, e comparados às estimativas de NPP potencial e NPP real, utilizando o modelo CASA e dados do ERA-Interim.... |
| Tipo: Artigo de periódico |
Palavras-chave: Modelo CASA; NDVI; HANPP; ERA-Interim; Produtividade Primária Líquida; Apropriação Humana da NPP; Índice de vegetação de diferença normalizada; The human appropriation of NPP; Net primary productivity; Annual crop; Cultivo Anual; Soja; Soybeans. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1144808 |
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