
A importância económica, social e cultural dos processos de colonização e invasibilidade de taxa florísticos exóticos constitui uma preocupação crescente. Ao mesmo tempo, as alterações estruturais e funcionais que acompanham este tipo de taxa nas comunidades vegetais constituem um desafio para o investigador e para o gestor ambiental. Ao longo do presente trabalho foi seleccionada uma amostra de 60 taxa de origem exógena, correlacionando a sua distribuição com vaiáveis biofísicas (altitudinais e geológicas) e antrópicas (uso do solo, taxa bruta de mortalidade, nº de alunos matriculados em estabelecimentos de ensino, etc., …). Os resultados obtidos evidenciam como a heterogeneidade ambiental resulta um aspecto determinante no sentido de estimular a diversidade deste tipo de taxa. Contudo, e em relação a esta heterogeneidade ambiental, é notória a maior influência das variáveis antrópicas, uma vez que, estas são as principais responsáveis pelas alterações ambientais e, portanto, pela maior ou menor presença deste tipo de espécies vegetais.
The economic, social and cultural importance of the processes of colonization and exotic invasibility of taxa constitutes an increasing concern. At the same time, the structural and functional alterations as a consequence of the occurrence of this type of taxa in the vegetal communities constitutes a challenge for the research and the environment manager. Throughout the present work a sample of 60 non native taxa origin was selected, correlating its distribution with variables biophysics (altitude and geologic) and anthropic (use of the ground, rude tax of mortality, nº of pupils registered educational establishments, etc.,…). The gotten results evidence as the environment heterogeneities results a determinative aspect in the direction to stimulate the diversity of this type of taxa. However, and in relation to this environment heterogeneities, the biggest influence of the anthropic variables is apparently the main responsible for environment alterations and, therefore, for the greater or minor presence of this type of vegetal species.
Flora (Exótica), Factores ambientais, Biodiversidade, 581.5/.9(469)
Flora (Exótica), Factores ambientais, Biodiversidade, 581.5/.9(469)
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