The problem of withdrawal of chemical elements by utilisation of Scots pine (Pinus sylvestris L.) biomass
Joanna Skonieczna , Stanisław Małek , Andrzej Węgiel
AbstractThe utilisation of Scots pine stands in Poland is limited to timber assortments cut from the stem. Usually, along with timber, the bark is also removed from forest. Tops, branches, needles, cones and roots remain in the forest environment. Currently, due to increasing demand for biomass, especially for energy production, the possibilities of utilisation of other than stemwood parts of the tree are being assessed. The problem arising is, however, depletion of the forest environment by withdrawal of chemical elements. This is particularly important for Scots pine stands, that grow mostly on poor soils. The aim of the study was to determine chemical composition of different tree parts, as well as to model utilisation systems and their influence on mineral withdrawal from the forest environment. In the Drawno forest district (north-west Poland), 20 sample plots were chosen in even-aged, 91 to 100 year old, pine stands. Plots size was 0.5 ha. On the plot area 15 model trees were chosen, that represented all the variety of dimensions. Model trees were cut down, measured, divided into parts and weighted. Dry mass was established in the laboratory. From each model tree, 9 samples were taken: thick wood and its bark, thin wood and its bark, dead branches, thick branches, thin branches, needles and cones. Samples were dried at 60 °C, crushed, mineralised in HNO3 and, via an ICP-OES, device, content of the following minerals was determined: K, Ca, Mg, P, Fe, Mn, Cu, Zn, Al and Ni. Without mineralisation, by using a LECO TruMac CNS device, the content of C, N and S was determined. The content of chemical elements in different parts of the tree was calculated for all model trees and extended to whole sample areas. The results enabled modeling of different utilisation strategies to asses their impact on the forest environment.
|Publication size in sheets||0.3|
|Book||Jagodziński Andrzej M., Węgiel Andrzej (eds.): Forest Biomass Conference 2013, 7-9 October 2013, Mierzęcin, Poland : book of abstracts, 2013, Poznań University of Life Sciences, ISBN 978-83-921460-9-4, 60 p.|
|Keywords in English||Scots pine, forest utilisation, chemical elements|
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