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Advisor(s)
Abstract(s)
The coppice is a very flexible cultural system producing wood of different dimensions. Small-caliber wood formerly with great demand, is now less interesting for the market (although the potential interest for biomass) while the stands have been aging without silvicultural intervention, having as a consequence the degradation of the quality of the wood and the trees health status. It is therefore necessary to improve the management of existing coppices by applying alternative silvicultural models in order to obtain more valuable wood. For this purpose, a trial was established in 1994 consisting of four permanent plots in a coppice that resulted from the final cut of a sweet chestnut high-forest stand in 1992. Three silvicultural management models were tested in order to produce wood of small (P1 = Model 1), medium (P2 = Model 2) and large (P4 = Model 3) dimensions. A control plot was established without any type of silviculture which corresponds to the most of the existing chestnut coppices (P3 = without intervention). Thinnings were applied based on the dominant height growth of the shoots, prescribed in the respective management models, at 7 and 11 years in P1, P2 and P4. The last thinning in plot P4 was applied at age 16 according to Model 3. Twenty four years after the installation, the silvicultural models were evaluated according to their objectives in terms of growth, yield and quality of the wood produced. This evaluation period corresponds to the Model 1 rotation period (final cut planned for an age 25 - 30 years). The results of the application of the silvicultural models are compared with the reference models recommended for wood production. Model 1 presents a dg of about 17 cm and hg of 13 m as well as ddom 23 cm, hdom 15 m and basal area G 30.4 m2 ha-1 being in accordance to the expected values (mean diameter 14-25 cm at 25-30 years). In the plot without intervention the same basal area is obtained (G 30.9 m2 ha-1) but only with a dg of 14.5 cm. From the last thinning at 11 years of age, we observed in P1 4% mortality in stools and 7% in shoots while in P3, plot without intervention, intense competition led to a reduction of 27% in the number of stools and 68% in the number of shoots in relation to the existing density at 11 years. In this plot there is a reduction in the number of stools almost equivalent to that imposed to P1 by thinnings. In plots P2 and P4, no mortality was observed. In Models 2 and 3 the observed growth follows closely the expected for this growth stage of the coppice. The quality of the individual shoots for wood is clearly superior to that of the plot without intervention although the dominant trees may have similar growth rates. Comparing the mean dendrometric values, higher values were observed in plots with the models application. It is verified that the treatment without intervention naturally tends toward to the results of Model 1. The results also show that when the wood is used for saw-timber silvicultural intervention is essential.
Description
Keywords
Castanea sativa Mill. Silvicultura Condução cultural Talhadia Produção de madeira
Citation
Patrício, Maria do Sameiro; Nunes, Luís; Iamshchikov, Vladislav; Saraiva, Daniel; Miranda, Fernando; Monteiro, Maria Loreto (2017). Ensaio de modelos de gestão silvícola em talhadia de castanheiro: 24 anos de avaliação. In 8º Congresso Florestal Nacional. Viana do Castelo. ISBN 978-972-99656-6-1
Publisher
Sociedade Portuguesa de Ciências Florestais