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- W2018759780 abstract "Abstract Wood volume yield and stand structure were investigated for Norway spruce understorey growing at 1500 trees ha −1 under birch shelters of two different densities, 300 and 600 trees ha −1 , and Norway spruce growing without shelter, in a field trial in the boreal coniferous forest, 56 years after the establishment of the stand and 19 years after establishment of the trial. Wood volume yield in sheltered spruce (mean annual increments of 1.87 and 1.78 m 3 ha −1 year −1 under the dense and sparse shelterwoods, respectively) was significantly lower than that of unsheltered spruce (mean annual increment 2.43 m 3 ha −1 year −1 ). The loss in wood volume yield for sheltered spruce was more than compensated for by the additional wood volume yield in the shelterwoods (mean annual increments 3.26 and 1.88 m 3 ha −1 year −1 for the dense and sparse shelterwood respectively). Shelterwood density did not produce any significant differences in inequality of the understorey stands, measured as skewness and the Gini coefficient for the wood volume distributions. This implies that two-sided competition for nutrients and water was more significant than competition for light. Immediately after trial establishment, trees in the no shelterwood treatment (i.e. where all overstory trees had been removed) showed a marked increase in diameter growth. Over time, the growth rate of unsheltered Norway spruce was reduced to a level comparable to that of sheltered spruce. The difference in average diameter has persisted during the trial period. There was no similar effect on height growth, resulting in an increased slenderness index ( h / d ) with increased shelterwood density for the understorey trees." @default.
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- W2018759780 title "Wood volume yield and stand structure in Norway spruce understorey depending on birch shelterwood density" @default.
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- W2018759780 doi "https://doi.org/10.1016/s0378-1127(99)00008-0" @default.
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