Structure and regeneration capacity of a urban forest fragment/Estrutura e capacidade regenerativa de fragmento florestal urbano
Understanding the plant communities affected by human activities related to urbanization is an important tool to conserve these. In this way, this study on an urban forest fragment aimed to evaluate, through a phytosociological study and investigation of the germination of the seed bank, the current...
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Veröffentlicht in: | Acta scientiarum. Biological sciences 2013-04, Vol.35 (2), p.203 |
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Sprache: | spa |
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Zusammenfassung: | Understanding the plant communities affected by human activities related to urbanization is an important tool to conserve these. In this way, this study on an urban forest fragment aimed to evaluate, through a phytosociological study and investigation of the germination of the seed bank, the current forest structure, the successional strata, and the regenerative capacity of the remnant. Three different stages comprised this research, the first with a floristic survey of the entire forest remnant, then the phytosociological study of the canopy (PAP above 10 cm) and regeneration strata (PAP 5-10 cm), and at last, the study on the seed bank. The phytosociological survey of the canopy stratum presented 1,368 individuals, with 41 species distributed into 24 families. The stratum of natural regeneration had 665 individuals, being 38 species distributed into 24 families. The seed bank was made up by only 8 native species, and 3 exotic species. The floristic diversity of the seed bank in all samples was low due to few species provide seeds to the soil. In addition, the strata and the seed bank had a low similarity, confirming thus the fragility and the need for preservationist attitudes. Keywords: forest remnant, phytosociology, seed bank. Compreender as comunidades vegetais afetadas pelo desenvolvimento das atividades humanas relacionadas a urbanizacao e um importante instrumento para a manutencao desses. Assim, este trabalho, que trata de um remanescente florestal isolado junto ao meio urbano, procurou avaliar atraves de um estudo fitossociologico e de germinacao de banco de sementes a estrutura florestal atual, os estratos sucessionais e a capacidade de regeneracao do remanescente. O trabalho consistiu de tres etapas diferenciadas, a primeira com o levantamento floristico de todo o remanescente florestal, apos o estudo fitossociologico dos estratos maduro (PAP acima de 10 cm) e do estrato de regeneracao (PAP de 5 a 10 cm) e por ultimo o estudo do banco de sementes. O levantamento fitossociologico dos individuos maduros apresentou 1368 individuos sendo 41 especies distribuidas em 24 familias. O estrato de regeneracao natural apresentou 665 individuos sendo 38 especies distribuidas em 24 familias. A composicao do banco de sementes foi de apenas oito especies nativas e tres exoticas. Podemos afirmar que a diversidade floristica do banco de sementes em todas as amostras foi baixa, isso porque sao poucas especies que proporcionam sementes para o solo. Aliado a isso |
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ISSN: | 1679-9283 |
DOI: | 10.4025/actascibiolsci.v35i2.14810 |