Variation of the chemical composition of Pyrenean oak (<Emphasis Type="Italic">Quercus pyrenaica</Emphasis> Willd.) heartwood among different sites and its relationship with the soil chemical characteristics |
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| Authors: | João Carvalho Óscar Cardoso Mário Costa Abel Rodrigues |
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| Institution: | 1.Departament of Forest Science and Lanscape Architecture,Universidade Trás-os-Montes Alto Douro,Vila Real,Portugal;2.CITAB - Centre for the Research and Technology of Agro-Environment and Biological Sciences,Vila Real,Portugal;3.IDMEC – Mechanical Engineering Department, Instituto Superior Técnico,Universidade de Lisboa,Lisbon,Portugal;4.Instituto Nacional de Investiga??o Agrária e Veterinária,Oeiras,Portugal |
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| Abstract: | This work presents the results of a study on the variation of the chemical composition of Pyrenean oak (Quercus pyrenaica Willd.) heartwood among different sites and its relationship with the soil chemical characteristics. The chemical characteristics of the heartwood are quantified in terms of proximate and ultimate analysis, calorific value and ash composition. Subsequently, the relationship between the wood chemical characteristics and the soil characteristics was also examined. The results showed no significant differences between the wood chemical characteristics from different sites. There are, however, significant differences between trees from the same site regarding the wood ash content, the calorific value and the contents of nitrogen and hydrogen. Strong correlations were observed between the heartwood ash contents of BaO, MnO, CuO and TiO2 and the soil nitrogen, phosphorous and potassium and the soil exchangeable base contents. |
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