Stand Structure in a Heterogeneous Old-growth Norway Spruce (Picea abies (L.) Karst.) Forest in Northern Sweden
Abstract: This study investigate the growth trend in an unmanaged Norway spruce forest in VästerbottenCountry, Sweden. The result indicate that relationship between the diameter at breast height(1.3 m) and height follow a statistical significant trendline, where taller trees also representwider tree diamater. The diameter hade a lower correlation to tree age, indicating that sometrees in this area can have been suppressed for a time or have experience periods of highcompetition. Climate data (temperature, precipitation and North Atlantic oscillation) seem tohave had only a partial (<50%) effect on the tree growth during two 40-years period. NorthAtlantic Oscillation showed no correlation with any tree chronology (standard and residual)during the past 160 years. A principle component analysis (PCA) were conducted, where thetwo strongest components corresponded to a cumulative variance equal to 55.5%. Nochronology based on the two strongest components could fully explain the interaction betweenpast climate and the tree ring growth detected in the study area.
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