Distribution of extractive substances in the stem of oak [Quercus petrea] and pine tree
1986
Krutul, D. | Buzak, J. (Szkola Glowna Gospodarstwa Wiejskiego - Akademia Rolnicza, Warszawa (Poland). Wydzial Technologii Drewna)
The share of extractive substances in examined oak and pine decreases in the direction from the pith towards the periphery and is the lowest at 2 m height. The share of extractive substances in wood increases with the height of stem. However above 20th annual ring the changes become irregular. The greatest share of extractive substances are in topwood. In the examined oak and pine wood there is no correlation between the changes of the width of annual rings and the share of late wood on one hand and the changes of the share of extractive substan1052ces on the o
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