Journal
FORESTS
Volume 14, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/f14061194
Keywords
forest management; pine; competition indices
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This study compared the effects of different thinning designs and strategies on Scots pine plantations in Sweden, including basal area, total and standing volumes, and periodic annual increment. The results showed that there were no significant differences in standing and total volumes among treatments in the short or long term. Although using distance-dependent competition indices improved the growth model slightly, distance-independent models were just as effective in predicting diameter growth. Schematic thinning could be a viable option for a first commercial thinning or one-time thinning if, at least, one more thinning is included in the management plan, or if the motivating interest is mainly volume.
The first commercial thinning usually entails a high cost in harvest operations and a low resulting income. From a practical forestry perspective, a schematic spatial selection might be more efficient than a selective approach. Therefore, this study aimed to compare basal area, total and standing volumes, and periodic annual increment (PAI), as well as stand structure, between different thinning designs (selective and schematic thinning) and strategies (thinning once or more than once) over a long-term monitoring period of Scots pine (Pinus sylvestris) plantations in Sweden. We also evaluated the relevancy of distance-dependent competition indices (CIs) in individual tree growth models by comparing growth model predictions with the use of distance-dependent and distance-independent CIs. Despite higher heterogeneity in schematically thinned stands, there were no significant differences in standing and total volumes (m(3)& BULL;ha(-1)) among treatments in the short or long term. Although the inclusion of a distance-dependent CI improved the model slightly, distance-independent models predicted diameter growth just as effectively. Schematic thinning could be a viable option for a first commercial thinning or one-time thinning if, at least, one more thinning is included in the management plan, or if the motivating interest is mainly volume.
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