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    QUANTIFICATION OF BIOLOGICAL CONTAMINATION BY EXOTIC TREE SPECIES IN AN ARAUCARIA FOREST FRAGMENT IN LAGES, SANTA CATARINA STATE

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    O presente trabalho objetivou avaliar a contamina\ue7\ue3o biol\uf3gica ao longo do tempo em uma comunidade arb\uf3rea em est\ue1gio sucessional avan\ue7ado/tardio da Floresta Ombr\uf3fila Mista Montana, adjacente a um plantio de Pinus taeda L. em Lages - SC. Para isso, foram alocadas 25 parcelas de 20 x 20 m, distribu\ueddas em cinco transe\ue7\uf5es de cinco parcelas cada, alocadas perpendiculares \ue0 borda de contato com o plantio de pinus. Em cada parcela foram mensurados (DAP 65 5 cm, medido a 1,30 m do solo), coletados e identificados todos os indiv\uedduos arb\uf3reos vivos. Quatro anos ap\uf3s o primeiro invent\ue1rio, os mesmos indiv\uedduos foram novamente inventariados, quantificando-se os indiv\uedduos mortos, sobreviventes e adicionando os recrutas. Para os dois per\uedodos foram calculados os descritores fitossociol\uf3gicos, quantificados os indicadores de invas\ue3o para a comunidade como um todo e grupos ecol\uf3gicos e calculadas as taxas demogr\ue1ficas. No primeiro ano foram amostradas 73 esp\ue9cies e no segundo 74 esp\ue9cies, dentro das quais, duas foram ex\uf3ticas: Pinus taeda e Ligustrum lucidum W.T. Aiton. Ambas tiveram baixos valores dos indicadores de invas\ue3o para a comunidade nos dois anos, no entanto, com aumento da participa\ue7\ue3o de Pinus taeda entre as esp\ue9cies pioneiras ao longo do tempo. Os resultados das taxas demogr\ue1ficas sugerem que, para os diferentes grupos ecol\uf3gicos, o processo de invas\ue3o encontra-se em fases distintas. Conclui-se que o grupo das esp\ue9cies pioneiras foi o componente mais afetado pela invas\ue3o biol\uf3gica, o que refor\ue7a a necessidade de an\ue1lise, considerando os diferentes grupos ecol\uf3gicos.The present study aimed to evaluate the biological contamination over time in a tree community of Montane Araucaria forest, in advanced successional stage, adjacent to a Pinus taeda L. plantation, in Lages, SC state. For this sake, a total of, 20 x 20m, 25 plots, distributed in five transects with five plots each, were allocated perpendicular to the edge in contact with the pinus plantation. In each plot, all living trees were measured (cbh 65 5 cm, measured at 1.30 m above soil level), collected and identified. Four years after the first inventory, the same individuals were re-inventoried, the dead individuals and survivor quantified and recruits added. For the two evaluated years, phytosociological descriptors were calculated, indicators of biological invasion quantified for all community as well as for ecological groups and the demographic rates determined. A total of 73 and 74 species were sampled in the first and second years, among of them two exotic species: Pinus taeda and Ligustrum lucidum W.T. Aiton. Both species showed low values of the invasion indicators, but with an increment in the participation of Pinus taeda among pioneer species over time. Results of demographic rates suggest that, for different ecological groups, the invasion process is in distinct stages. We conclude that the pioneer species was the most affected component by biological invasion, which reinforces the need for analysis considering the different ecological groups
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