Browsing by Author "Mesquita, Susana"
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- Management models evaluation of a castanea sativa coppice in the northeast of PortugalPublication . Patrício, Maria Sameiro; Monteiro, Maria do Loreto; Nunes, Luís; Mesquita, Susana; Beito, Sónia; Casado, JoséIn a chestnut high forest converted in coppice, 4 permanent plots were established in 1994. These plots are being managed according to the silvicultural models proposed by Bourgeois (1992) and adapted to our conditions. The treatments are: T1 = Model 1: small dimensions; T2 = Model 2: medium dimensions; T3 = Model 3: Large dimensions; Control = (coppice without intervention). In 2003, a 2nd thinning was applied in order to select the more straight and cylindrical shoots without defects. The principal dendrometrical parameters (such as: number of stumps per hectare; number of shoots per hectare; mean total height of the shoots; dominant height of the shoots; mean DBH of the shoots; dominant diameter of the shoots; basal area of the shoots per hectare and basal area of the shoots) were measured, before and after thinning. Results show that T3 presents greater vigour and the highest dominant height. Concerning dominant height, T2 was exceeded by T1, because it has higher number of shoots and, consequently, strong competition in relation to available site resources. It was expected a T2 with dominant height superior to T1, but we believe that T2 will recover its dominant height leadership with the heavy thinning applied in the last intervention (about 75% reduction in the number of shoots). The control follows the other plots dominant height growth pattern, although presents inferior mean basal area per shoot in comparison to the other treatments.
- Management models evaluation of a castanea sativa coppice in the Northeast of PortugalPublication . Patrício, Maria Sameiro; Monteiro, Maria do Loreto; Nunes, Luís; Mesquita, Susana; Beito, Sónia; Casado, José; Guerra, HéliaIn a chestnut high forest converted into coppice, 4 permanent plots were established in 1994. These plots are being managed according to the silvicultural models proposed by Bourgeois (1992) and adapted to our conditions. The treatments are: T1 = Model 1: small dimensions; T2 = Model 2: medium dimensions; T3 = Model 3: Large dimensions; Control = coppice without intervention. In 2003, a 2nd thinning was applied in order to select the more straight and cylindrical shoots without defects. The principal dendrometrical parameters (such as: number of stumps per hectare; number of shoots per hectare; mean total height of the shoots; dominant height of the shoots; mean DBH of the shoots; dominant diameter of the shoots; basal area of the shoots per hectare and basal area of the shoots) were measured, before and after thinning. Results show that T3 presents greater vigour and the highest dominant height. Concerning dominant height, T2 was exceeded by T1, because it has a higher number of shoots and, consequently, strong competition in relation to available site resources. It was expected a T2 with dominant height superior to T1, but we believe that T2 will recover its dominant height leadership with the heavy thinning applied in the last intervention (about 75% reduction in the number of shoots). The control follows the other plots dominant height growth pattern, although presents inferior mean basal area per shoot in comparison to the other treatments.
- Management models evaluation of Castanea sativa coppice in the northeast of PortugalPublication . Patrício, Maria Sameiro; Monteiro, Maria do Loreto; Nunes, Luís; Mesquita, Susana; Beito, Sónia; Casado, JoséIn a chestnut high forest converted in coppice, 4 permanent plots were established in 1994. These plots are being managed according to the silvicultural models proposed by Bourgeois (1992) and adapted to our conditions. The treatments are: T1 = Model 1: small dimensions; T2 = Model 2: medium dimensions; T3 = Model 3: Large dimensions; Control = (coppice without intervention). In 2003, a 2nd thinning was applied in order to select the more straight and cylindrical shoots without defects. The principal dendrometrical parameters (such as: number of stumps per hectare; number of shoots per hectare; mean total height of the shoots; dominant height of the shoots; mean DBH of the shoots; dominant diameter of the shoots; basal area of the shoots per hectare and basal area of the shoots) were measured, before and after thinning. Results show that T3 presents greater vigour and the highest dominant height. Concerning dominant height, T2 was exceeded by T1, because it has higher number of shoots and, consequently, strong competition in relation to available site resources. It was expected a T2 with dominant height superior to T1, but we believe that T2 will recover its dominant height leadership with the heavy thinning applied in the last intervention (about 75% reduction in the number of shoots). The control follows the other plots dominant height growth pattern, although presents inferior mean basal area per shoot in comparison to the other treatments.
- Sustainable management of chestnut forested areas in high forest and coppice systemsPublication . Monteiro, Maria do Loreto; Patrício, Maria Sameiro; Nunes, Luís; Beito, Sónia; Mesquita, Susana; Garcia, Blanca; Guerra, HéliaSince 2002 a AGRO research project, supported by European Community, is being developed aimed to propose and to validate models for chestnut forests sustainable management in two subsystems, high forest and coppice The management has been based in silvicultural techniques having in view the conservation and rational utilization of soil as well as the suitable account for biomass, tree incorporated and lift annual soil restored nutrients, including good environmental practices, promoting seedling, assuring the ecosystem continuity, health and vitality. We also intended in this project to evaluate the productive potentiality of Castanea sativa Mill., through the establishment of volume and biomass prediction equations, modeling the relationship of tree height to diameter at breast height and defining site index. At the present time and for the high forest subsystem, dendrometrical measurements were made in all standing trees from installed plots already existent in communal old stands where, we also felled some trees for characterization and account of biomass by components. A final cut was applied in one of those stands an4 data altogether, is being statistically processed for productive potentiality evaluation. Still for high forest, dendrometrical measurements were made in all 15 new 3000m2 plots installed in forest producers owned properties and equally distributed by 5 empirically defined productive levels. One of these young plots was the stage for a forest producer's demonstration action on stand improvement. For the coppice subsystem management models have been made available and discussed in situ with forest technicians and producers by means of another demonstration action.
- Sustainable management of chestnut forested areas in high forest and coppice systemsPublication . Monteiro, Maria do Loreto; Patrício, Maria Sameiro; Nunes, Luís; Beito, Sónia; Mesquita, Susana; Campilho, Blanca; Guerra, HéliaSince 2002 a AGRO research project, supported by European Community, is being developed aimed to propose and to validate models for chestnut forests sustainable management in two subsystems, high forest and coppice The management has been based in silvicultural techniques having in view the conservation and rational utilization of soil as well as the suitable account for biomass, tree incorporated and lift annual soil restored nutrients, including good environmental practices, promoting seedling, assuring the ecosystem continuity, health and vitality. We also intended in this project to evaluate the productive potentiality of Castanea sativa Mill., through the establishment of volume and biomass prediction equations, modeling the relationship of tree height to diameter at breast height and defining site index. At the present time and for the high forest subsystem, dendrometrical measurements were made in all standing trees from installed plots already existent in communal old stands where, we also felled some trees for characterization and account of biomass by components. A final cut was applied in one of those stands an4 data altogether, is being statistically processed for productive potentiality evaluation. Still for high forest, dendrometrical measurements were made in all 15 new 3000m2 plots installed in forest producers owned properties and equally distributed by 5 empirically defined productive levels. One of these young plots was the stage for a forest producer's demonstration action on stand improvement. For the coppice subsystem management models have been made available and discussed in situ with forest technicians and producers by means of another demonstration action.