Estudos florísticos e fitossociológicos na restinga do Crispim – PA

Abstract

The sandbank of Crispim, is located 8 km from the village of Marudá, municipality of Marapanim state of Pará, between the geographical coordinates 00°37'00" to 00°34' 42" lat S. and 47°40'24" to 47°38'00" W. Gr. Seven plant communities are represented in the restinga, distributed from sea to continent in: halophytic, reptant psammophytic, herbaceous swamp, interior dunes, field between dunes, open shrub field and restinga forest. This paper deals only with the first three communities. For the phytosociological studies carried out in periods of higher and lower rainfall intensity, the qaudrados method was used for the halophytic and herbaceous marsh communities and the point method for the reptant psammophilous community. The halophilic community, situated in the supramarine zone, is represented by three species: Sesuvium portulacastrum L., Sporobolus virginicus (L.) Kunth elresine vermicularis Moq. The reptant psammophyllous occurs on the first dune cordon, and in this community the species with the highest value of importance indices (IVI), for both periods: Paspalum vaginatum Sw. and Canavalia rosea (Sw.) De. The herbaceous wetland, located on the reverse side of the first dune cordon r, presents a greater diversity, with 15 species distributed in 8 families, where the species with the highest IVI's, in the period of greater rainfall intensity, were: Fimbristylis spadicea Vahl., Paspalum vaginatum Sw. and Sporobolus virginicus (L.) Kunth. An inversion of IVI values occurred in the period of lower rainfall intensity, with the species Sporobolus virginicus (Sw.) Kunth., Fimbristylis spadicea Vahl. and Paspalum vaginatum Sw. predominating (CNPq/ MPEG).