Florística e fitossociologia em um gradiente vegetacional na transição Cerrado-Amazônia

Abstract

This study aimed to: a) characterize and analyze the floristic and phytosociology of tree and shrub component and their relations with soil and climatic variations of a vegetation gradient area in Tabaporã municipality, northern Mato Grosso; b) analyze the influence of the Amazon biome in the richness and diversity of woody flora. Six transects were systematically allocated, each one with 35 point-centered quarters. At each point we sampled the eight closest individuals with diameter at breast height equal or above five centimeters. The diameter, height and distance from the tree to the point were measured. We recorded 136 species, 88 genera and 50 botanical families. The density was 936 plants per hectare and the basal area was 7.41 m² per hectare. The Shannon diversity index (H') was 3.99 nats / individual and the Pielou evenness (J’) was 0.81. The species with the highest importance value were Caraipa savannarum, Licania apetala, Myrcia splendens, Laplacea cf fructicosa, Tapirira obtusa. The flora of the area showed widespread influence of the two biomes, the Amazon and Cerrado. The relief was classified as wavy and the soils were classified as Litholic Neosols. The study area was classified as wooded savannah with riparian forests. Density and basal area results are within the amplitude range found in savanna surveys. However, the high richness and diversity are mainly explained by the inclusion of riparian vegetation in the sample and good status in area of conservation, and secondarily due to geographical position (transition Cerrado-Amazon).