I have attended will be attending the 8th INTECOL Wetlands Conference next month (July 20-25) in Cuiabá, MT, Brazil. I’ve presented a talk titled “Looking from above: Towards an integrative view of macrophyte growth and primary productivity in the Amazon floodplain”, on the Topic Group III: Ecosystem services and biodiversity, Primary production symposium. I’m including the submitted abstract below, and you can download the PDF of the presentation by clicking here.
Looking from above: Towards an integrative view of macrophyte growth and primary productivity in the Amazon floodplain.
Thiago Sanna F. Silva, Maycira M. P. F. Costa, John M. Melack
Aquatic macrophytes play important roles in the carbon budget of the Amazon floodplain due to their large coverage and high primary productivity, yet studies of macrophyte productivity in the Amazon region are few. The present study combines multi-temporal and multi-sensor satellite imagery and in situ data to develop a spatially and temporally consistent estimate of macrophyte coverage and primary production in the eastern Amazon floodplain. Field results indicate that plant biomass accumulates during rising water and reduces later in the season. Annual net primary production calculated from field data varied between 2470 and 3490 g/m2 (dry weight), with above water production between 650 and 1100 g/m2 and below water production between 1700 and 2570 g/m2. Remote sensing results indicate that within a single date, C-HV radar (ASAR) and infrared (MODIS) data have the highest potential for discriminating macrophytes from other cover types. The temporal variation in radiometric signature from macrophytes in C-HH at 35º (Radarsat) incidence angle and infrared (MODIS) differ the most from other cover classes. Further research is being conducted on the use of object-oriented segmentation/classification and spatial modeling to accurately map macrophyte cover and estimate macrophyte primary production over time, allowing for improvements in the current estimations of the contribution of macrophyte communities to the carbon budget of the Amazon floodplain.