Tree ring width and wood density as the indicators of climatic factors and insect outbreaks affecting spruce growth |
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| Institution: | 1. Federal Research and Training Centre for Forests, Natural Hazards and Landscape (BFW), Department of Forest Genetics, Seckendorff-Gudent-Weg 8, 1131 Wien, Austria;2. University of Natural Resources and Life Sciences (BOKU), Institute of Wood Science and Technology, Konrad-Lorenz-Straße 24, 3430 Tulln an der Donau, Austria;3. CFE – Centre for Functional Ecology – Science for People & the Planet, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000–456, Coimbra, Portugal;4. University of Natural Resources and Life Sciences (BOKU), Institute of Silviculture, Peter-Jordan-Straße 82, 1190 Wien, Austria;5. Federal Research and Training Centre for Forests, Natural Hazards and Landscape (BFW), Department of Forest Growth and Silviculture, Seckendorff-Gudent-Weg 8, 1131 Wien, Austria |
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| Abstract: | Tree ring width (TRW), maximum (MXD), mean (MED) and minimum (MID) wood density were investigated in samples from the vicinity of the Tuchola Forest Biosphere Reserve (Northern Poland) in an attempt to distinguish the relative importance of climate and insect attack on the growth of Norway spruce. Selected climate parameters were used for a multiple regression to predict tree-ring width during insect outbreaks. This also used AICc for model selection. Additionally, k-means clustering was then used to group the yearly data of TRW, MXD, MID and the data of insect outbreaks. The respective climate data and data on insect outbreaks during the years 1962–1996 revealed a strong influence of May precipitation on TRW and insect outbreaks on MID. Missing tree rings or narrow rings and lower MXD together with higher MID might indicate increased insect activity. |
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