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Articles containing the keyword 'ydinsäteet'

Category : Article

article id 4938, category Article
Matti Kärkkäinen. (1976). Mäntyrunkojen ydinsäteiden korkeus ja leveys. Silva Fennica vol. 10 no. 2 article id 4938. https://doi.org/10.14214/sf.a14783
English title: Height and width of rays in Scots pine stems.
Original keywords: mänty; ydinsäteet; pihkatiehyet; puuaine; puun rakenne
English keywords: Pinus sylvestris; Scots pine; xylem; fusiform rays; uniseriate rays; rays
Abstract | View details | Full text in PDF | Author Info

In this study the width and height of 1,588 uniseriate and 454 fusiform rays were measured from tangential sections of four Scots pine (Pinus sylvestris L.) trunks. The samples represented various height levels and distances from the pith. The average width of the uniseriate rays was 19.7 μm and that of the fusiform rays, 51.9 μm. The average height of the uniseriate rays was 215.7 μm and that of the fusiform rays 406.2 μm. Due to this difference in height, it may be possible to develop an automatic system for distinguishing between uniseriate end fusiform rays on the basis of their height.

The PDF includes a summary in English.

  • Kärkkäinen, E-mail: mk@mm.unknown (email)
article id 4879, category Article
Matti Kärkkäinen. (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 stems.
Original keywords: mänty; runko; puuaines; ydinsäteet; pihkatiehyet; pihka
English keywords: Pinus sylvestris; Scots pine; structure of wood; fusiform rays; uniseriate rays; resin canal; pitch
Abstract | View details | Full text in PDF | Author Info

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.

  • Kärkkäinen, E-mail: mk@mm.unknown (email)

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