Resposta espectral dos índices EVI e NDVI dos bancos de macrófitas em lagos de meandro abandonado na região do Rio Purus, AM

The objective of this study was to analyze the feasibility of using multi-temporal images of Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) for the distribution of aquatic macrophytes in different seasons. The analyzes were done in eight abandoned meander lakes near the Purus River, between Boca do Acre and Pauini, AM. We estimated species richness and coverage of macrophytes during 2012. Seasonal values of vegetation indices at a 250 m resolution were obtained from the average value of the images of 16-day composition MOD13 A1 product, between January 2001 to September 2012. We sampled four pixels of each lake. Data analysis tests included NMDS, PERMANOVA, ANOVA and Person correlation. Results indicated a correlation between the coverage area of macrophytes (EVI r = 0.5 and NDVI r = 0.4) and ecological groups (EVI r = 0.4 and r = 0.5 NDVI). EVI had more significant relation to macrophyte coverage (p = 0.01) while the NDVI responded ecological groups (p = 0.009). The influence of macrophytes in seasonal cycles was evident in temporal fluctuation of the indices NDVI and EVI.Pages: 3183-319