Phytosociology and floristic diversity in a cerrado area under different antropization levels, rio pardo de Minas, MG

Este estudo teve como objetivo avaliar a diversidade e a similaridade flor\uedstica de ambientes de Cerrado, sob diferentes n\uedveis de antropiza\ue7\ue3o por uso agr\uedcola e extrativismo, e gerar base de dados para subsidiar propostas de desenvolvimento sustent\ue1vel para a regi\ue3o Norte de Minas e sistemas de agricultura tradicional. Foram amostradas 4 \ue1reas nos seguintes ambientes: Arei\ue3o, Arei\ue3ozinho, Chapada de Latossolo e Tabuleiro, cujas identifica\ue7\uf5es foram feitas a partir de informantes-chave na Comunidade \uc1gua Boa, em Rio Pardo de Minas (MG). As unidades amostrais foram distribu\ueddas em 8 parcelas de 20 x 50 m, com 5 subparcelas. Foram medidos indiv\uedduos arb\uf3reos com circunfer\ueancia ao n\uedvel do solo maior ou igual a 15 cm. Para an\ue1lise dos \uedndices fitossociol\uf3gicos foram calculados os par\ue2metros densidade, domin\ue2ncia, freq\ufc\ueancia, \ue1rea basal e valor de import\ue2ncia, para cada ambiente. Para a diversidade flor\uedstica foi calculado o \uedndice de Shannon (H\u2019) e para an\ue1lise da similaridade o \uedndice de Jaccard (Sij). Em todos os ambientes, foi encontrado um total de 477 indiv\uedduos, distribu\ueddos em 21 fam\uedlias, com 48 esp\ue9cies bot\ue2nicas identificadas e 27 indiv\uedduos n\ue3o identificados. As cinco fam\uedlias mais importantes (maior VI) foram Fabaceae/Papilionoideae, Apocynaceae, Vochysiaceae, Sapotaceae e Fabaceae/Caesalpinoideae. J\ue1 as dez esp\ue9cies de maior import\ue2ncia foram Pouteria ramiflora, Dalbergia miscolobium, Hancornia speciosa, Macherium opacum, Sclerolobium paniculatum var. subvelutinum, Qualea grandiflora, Aspidosperma tomentosum, Byrsonima pachyphylla, Vochysia thyrsoidea e Hymenaea stigonocarpa. O \uedndice H\u2019 foi de 3,01; 2,72; 2,48 e 2,09 para Arei\ue3o, Arei\ue3ozinho, Chapada do Latossolo e Tabuleiro, respectivamente. O \uedndice Sij indicou, para todas as combina\ue7\uf5es entre os ambientes, que existia pouca similaridade flor\uedstica entre eles.The objective of the study was to evaluate diversity and floristic similarity of Cerrado environments, under different levels of anthropization for agricultural usage and extractivism, and to generate a database to subsidize sustainable development proposals for the North region of Minas Gerais State, and traditional agriculture systems. Four areas with different levels of anthropization were sampled, in the following environments: "Arei\ue3o, Arei\ue3ozinho, Chapada de Latossolo and Tabuleiro", whose identifications had been made from key informers in the \uc1gua Boa Community, in Rio Pardo de Minas (MG, Brazil). The sampled units were distributed in 8 parcels of 20 x 50 m, with 5 subplots. The trees with circumference at ground level of 15 cm or bigger were measured. For analysis of the phytosociology indexes the following parameters were calculated for each environment: density, dominance, frequency, basal area, and importance value. For the floristic diversity the Shannon (H') was calculated, and for the analysis of similarity the index of Jaccard index (Sij). In all the environments, it was found a total of 477 individuals, distributed in 21 families, with 48 botanical species identified, and 27 individuals not identified. The five most important (importance value) families was Fabaceae/Papilionoideae, Apocynaceae, Vochysiaceae, Sapotaceae and Fabaceae/Caesalpinoideae. And the ten most important species was Pouteria ramiflora, Dalbergia miscolobium, Hancornia speciosa, Macherium opacum, Sclerolobium paniculatum var. subvelutinum, Qualea grandiflora, Aspidosperma tomentosum, Byrsonima pachyphylla, Vochysia thyrsoidea and Hymenaea stigonocarpa. The H' index was of 3.01; 2.72; 2.48 and 2.09 for "Arei\ue3o, Arei\ue3ozinho, Chapada de Latossolo and Tabuleiro", respectively. The Sij index indicated a small floristic similarity for all the combinations between the environments