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The Ratio of Shoot Silhouette Area to Total Needle Area in Scots Pine

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The dependence of light interception efficiency on shoot structure was studied. The silhouette areas of 258 Scots pine (Pinus sylvestris L.) shoots inclined at different angles were measured, and the corresponding silhouette area to total needle area ratios (STAR) were determined. For each shoot, a mean silhouette to total needle area ratio (STAR) with respect to a spherical shoot orientation was calculated. STAR varied between 0.09 and 0.21 and averaged 0.14. For spherically oriented individual needles or leaves, the corresponding mean projection of unit foliage area is 0.25. Thus, the light interception efficiency of the shoots as indicated by STAR-values was on average reduced by 43% because of mutual shading of needles on the shoots. The silhouette areas and STAR-values were also calculated theoretically using a previous model of shoot geometry, and these values were compared to the empirical measurements. For. Sci. 34(4):894-906.

Keywords: Pinus sylvestris; Shoot structure; extinction coefficient; light interception efficiency

Document Type: Journal Article

Affiliations: The Finnish Forest Research Institute, Suonenjoki Research Station, 77600 Suonenjoki, Finland

Publication date: December 1, 1988

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