TITLE:
Phytosociology and Floristic Composition of the Infesting Community in Rice Crop Waterlogged
AUTHORS:
Bruna Penha Costa, Maria Rosangela Malheiros Silva, Carlos Augusto Rocha de Moraes Rego, Juan López de Herrera, Maria Soraia Fortado Vera Cruz, Ana Carolina Pinguelli Ristau, Marinez Carpiski Sampaio, Thatiane Nepomuceno Alves, Shirlene Souza Oliveira, Hannah Braz, Nitalo Andre Farias Machado
KEYWORDS:
Diversity, Oryza sativa L., Weeds
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.3,
February
12,
2018
ABSTRACT: The
objective of this study is to identify and quantify the floristic composition
of the weed community in the rice crop waterlogged in the municipality of Arari-MA.
The botanical material was obtained in three areas by randomly a hollow
rectangle of 0.50 m × 0.30 m by forty five times in each plot.
The aerial parts of weeds were harvested, identified, counted and oven dried
with forced air ventilation at 333.15 K to 343.15 K. These data were used to
determine the phytosociological parameters and the Shannon-Wiener diversity
index was also calculated. A total of 6607 plants were collected, being 4115
(62.28%) in the vegetative phase and 2492 (37.72%) in the reproductive phase.
The monocotyledonous group obtained the largest number of plants, 2882 in the
vegetative phase and 1535 in the reproductive phase. The Cyperaceae family recorded nine species and four genera and the Poaceae,
seven and four species in the vegetative and reproductive phases, respectively.
The species of higher IVI in the vegetative phase was E. sellowiana in the
area A1 with 82.86%, and in the reproductive F. dichotoma with
IVI of 90.49% in the area A3. The individuals density and species richness were
higher in the vegetative phase of the culture and the monocotyledonous group
predominated with the Cyperaceae and Poaceae families, and the weed diversity
among the areas was low.