A origem do material vegetal como resposta às alterações climáticas

Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia

The present work aims at presenting a first assessment of the plant survival on three arboreta, which were installed in Lisbon (Tapada da Ajuda), Sintra (Parque Natural de Sintra-Cascais) and Vila Real (Quinta dos Prados - Universidade de Trás-os-Montes e Alto Douro), as well as the survival analysis and the growth of plants from two provenance trials, one of Quercus robur L., located at Vale de Cavalos – Viseu, and another of Quercus ilex L., located at Herdade do Esporão - Reguengos de Monsaraz. The three arboreta belong to a study with 38 arboreta distributed from Scotland until Portugal (from latitude 37º until longitude 57º north). The arboreta were installed under the project REINFFORCE, with the aim to evaluate how the climate changes affect the Atlantic forest. The arboreta, represented by 35 species, interspecific level, and the provenance trials, intraspecific level, allow us to estimate the behaviour of these genetic materials in different environmental situations and to evaluate their potential use in future reforestation. The results obtained in the provenance trial Quercus robur L. at Vale de Cavalos – Viseu presented a survival rate above 70%. In terms of growth, we only observed one provenance with lower growth compared with other provenances. The results obtained in the provenance trial Quercus ilex L. at Herdade do Esporão - Reguengos de Monsaraz presented a survival rate of 48%. In terms of growth, the provenances from the Iberian Peninsula (Portugal and Spain) presented the lower growth rate. The obtained results are very preliminary. The information about arboreta concerns to the setting up phase (first year) and the information about the provenance trials was obtained only two years after the planting. Nevertheless, our results show variability among the different analysed provenances regarding the studied characteristics.