Abstract
The hypothesis that environmental changes have affected site productivity was tested through examination of site index over year of planting. Data included 197 experimental plots established 1886–1977 and 617 survey plots established 1952–1968, all with Scots pine (Pinus sylvestris L.). Effects of site differences were balanced in a multiple regression analysis. Evaluation with the current site index equation did not reveal any certain trend, but with a new site index equation based on data from repeated measurements of the experimental plots, a significant annual increase of site index of 2.4 cm was estimated for the period 1900–1977. However, the main difference was between stands established before and after 1940. Segmentation indicated a significant difference between these groups but no significant, continuous trend. The difference between the two groups could be related to differences in establishment and tending of the stands.
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© 1996 Springer-Verlag Berlin Heidelberg
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Elfving, B., Nyström, K. (1996). Stability of Site Index in Scots Pine (Pinus sylvestris, L.) Plantations over Year of Plantingin the Period 1900-1977 in Sweden. In: Spiecker, H., Mielikäinen, K., Köhl, M., Skovsgaard, J.P. (eds) Growth Trends in European Forests. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-61178-0_7
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DOI: https://doi.org/10.1007/978-3-642-61178-0_7
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