Crown structure and stem growth of Norway spruce undergrowth under varying shading.

Greis, Ilppo; Kellomäki, Seppo

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Silva Fennica vol. 15 no. 3 article id 5125 | 1981 | Article

Ilppo Greis , Seppo Kellomäki

Crown structure and stem growth of Norway spruce undergrowth under varying shading.

Greis I., Kellomäki S. (1981). Crown structure and stem growth of Norway spruce undergrowth under varying shading. Silva Fennica vol. 15 no. 3 article id 5125. https://doi.org/10.14214/sf.a15066

Abstract

The crown structure and stem growth of Norway spruce (Picea abies (L.) H. Karst.) undergrowth was studied in relation to the prevailing light conditions and potential photosynthesis. Shading decreased the stem height growth more than the length increment of laterals, producing a plate-shaped crown in deep shade. Needles responded to shading by adopting a horizontal inclination in deep shade. The needles were wide and thin respectively in shade. In the open the needle cross-section was almost square. Stem radial growth and height growth were both affected by shading exhibiting a linear response to the prevailing light conditions and the potential photosynthesis. Light conditions under dominating trees were closely correlated with the basal area of the dominating trees.

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Keywords
Norway spruce; Picea abies; photosynthesis; height growth; shading; crown; undergrowth; crown structure

Published in 1981

Available at https://doi.org/10.14214/sf.a15066 | Download PDF

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