1 research outputs found
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