Bernasconi L, Calamini G, Salbitano F, Teobaldelli M
Abstract: Deciduous dry Dipterocarp forests (DDF) in Thailand are severely degraded by historical and present effects of anthropogenic disturbances. The European Union funded a research project on “Ecology and sustainable semi-natural silvicultural management of indigenous forest of Central South East Asia” with the final aim of sustainable forest management and rehabilitation of both DDF and Mixed deciduous forests (MDF). The paper deals with the understanding of the some ecological characteristics and the regeneration pattern of DDF dominant species. The study was carried out inside the Wildlife Sanctuary of Huai Kha Khaeng. Surveys on stand structure were achieved in 6 permanent plots. Regeneration studies focused on seed and seedling ecology as far as it concerns seed production, fate of the seeds, and seedlings survivorship. Specific observations were performed on the damages agents affecting seedlings and saplings. Seed production of DDF-dominant Shorea siamensis and Shorea obtusa, peak at the beginning of rainy season when the risk of fire is lower, but the germination success of Shorea recalcitrant seeds depends on seasonal water availability. Germination proceeds very rapidly. Heavy-cotyledons seeds generate seedlings with highest crown biomass while small-sized seeds show heavier root biomass as compared to the former ones. Micro-coppicing tests highlighted the ability of the seedlings to react to disturbances affecting the aerial parts since the very early stages of life. Damages by insects are the most frequent both in DDF and MDF regeneration populations.
Citazione: Bernasconi L, Calamini G, Salbitano F, Teobaldelli M (1999). Forest ecological studies towards sustainable management in South East Asia . 2° Congresso Nazionale SISEF, Bologna, 20 – 22 Ott 1999, Contributo no. #c2.6.45