Floristic similarity of remanescents from cerrado in north regions of the legal Amazo

Abstract

Considering the abundance of species from the Cerrado domain and especially from the cerrado sensu stricto phytophysiognomy, studies to analyze and better understand this richness become important. Therefore, in order to better understand and understand this richness and diversity, the study was carried out in five areas of cerrado sensu stricto belonging to three regions in the north of the Legal Amazon. The objective was to analyze the floristic composition of shrub-tree species of remnants of cerrado sensu stricto located in different regions and municipalities of Tocantins, in addition to comparing the similarity between the areas. Forty-three sampling plots of 10x100 m were installed, totaling 4.3 hectares. Area 1 - eight plots of 10x100 m, totaling 0.8 ha, in the central-west region, in Monte do Carmo. Area 2 - eight plots of 10x100 m, totaling 0.8 ha, in the central-west region, in Santa Rita do Tocantins. Area 3 - ten plots of 10x100 m, totaling 1.0 ha, in the central region, in Divinópolis do Tocantins. Area 4 - ten plots of 10x100 m, totaling 1.0 ha, in the Jalapão State Park region, in Santa Rita do Tocantins and Area 5 - seven plots of 10x100 m, totaling 0.7 ha, in the Jalapão State Park region, in Mateiros . All individuals were sampled with circumference at breast height ≥ 20 cm, measured at 1.30 m from the ground. In the five areas of cerrado sensu stricto, a total of 7,069 individuals, 264 species, belonging to 110 genera, included in 46 families, were found. The matrix for the analysis of floristic similarity encompassed 264 species recorded in the five areas of cerrado sensu stricto, being area 1 (A1) 88 species, area 2 (A2) 53 species, area 3 (A3) 45 species, area 4 (A4) 62 species and area 5 (A5) 16 species. The heterogeneity observed between the areas evaluated indicates that the species of this cerrado physiognomy are characterized by the spatial distribution in “mosaics”, with a maximum limit of 100 species per studied area, and even the existing populations in nearby areas are floristically and structurally differentiated.