Phytosociological Assessment of Pastures under Flooded Low Land Conditions in the State of Amazon, Brazil

The phytosociological assessment of pastures is an important support tool for management recommendations. The objective of this work was to make a phytosociological assessment of flooded low land in Autazes-Amazon, Brazil. The study was carried out in two areas that had been flooded in the past. The inventory square method was applied using a square frame of 1.0 m(2), randomly thrown 31 times in each area of three hectares. In these two areas, 27,706 individuals were found, distributed in 12 families and 22 species. The most important families in number of species in the two areas were Poaceae (7) and Cyperaceae (4). Brachiaria subquadripara presented higher frequency, density, abundance and IVI values in both areas. The species B. subquadripara (118.45), Paspalum fasciculatum (51.25), Cynodon dactylon (46.99) and Lindernia crustacea (25.25) presented the highest IVI values in area 1 and the species B. subquadripara (111.66), C. dactylon (55.44), Acroceras zizanioides (33.70) and L. crustacea (24.91) the highest values in area 2. In both areas, the Poaceae family accounted for more than 90% of the total of the individuals found, and some species presented good forage potential.