Matti Kärkkäinen 
Mäntyrunkojen ydinsäteiden määrä ja koko.
Kärkkäinen M. (1973). Mäntyrunkojen ydinsäteiden määrä ja koko. Silva Fennica vol. 7 no. 2 article id 4879. https://doi.org/10.14214/sf.a14713
English title: Amount and size of rays in Scots pine stemsAbstract
The material consists of four Scots pine (Pinus sylvestris L.) stems from which 757 samples were taken from various heights and distances from the pith. According to the results, the number of rays and their sizes are greater at the stump level than higher up in the stem. The size increases, and the number decreases on moving from the pith outwards. However, there are differences between stems as regards the variation model. The ratio between the number of fusiform rays and that of uniseriate rays seems to be lower than anticipated earlier, about 1:40–1:50. The average proportion of ray volume varied from 5.6% to 7.3%.
The PDF includes a summary in English.
Original keywords
mänty;
runko;
puuaines;
ydinsäteet;
pihkatiehyet;
pihka
English keywords
Pinus sylvestris;
Scots pine;
structure of wood;
fusiform rays;
uniseriate rays;
resin canal;
pitch
Published in 1973
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Available at https://doi.org/10.14214/sf.a14713 | Download PDF
