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