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- W2050495596 abstract "Seven simple competition indices were evaluated for their ability to predict the 1983 volume increment of an 8-year-old jack pine (Pinus banksiana Lamb.) and trembling aspen (Populus tremuloides Michx.) trees. A total of 298 subject trees (two subsets of 149 subject trees for each species) were sampled. Each subset was randomly subsampled 48 times with replacement. Each of the 48 subsamples was separately analysed by calculating of Spearman rank correlations between the 1983 volume increment of the subject tree and the competition indices. The distance-dependent competition index (Daniels' 1976 competition index — dc1) based on all competitors selected by the horizontal sampling method was more correlated with the 1983 volume increment. dc1 was followed by distance-independent competition indices (Lorimer's 1983 competition index — lc1) based on trees only equal or in a higher height class than the height class of the subject tree. Also, competition indices based on only competitors of higher height class than the height class of the subject tree performed better than the modified Spurr's point density (Spurr's 1962). Although limited in scope because only one stand was studied, the results of this study suggest that evaluation of stand competition by means of competition indices in young shade-intolerant jack-pine/aspen mixed stands should take into account both the competitor size and inter-tree distances between subject trees and all selected competitors." @default.
- W2050495596 created "2016-06-24" @default.
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- W2050495596 date "1989-02-01" @default.
- W2050495596 modified "2023-09-26" @default.
- W2050495596 title "Evaluation of simple competition indices for the prediction of volume increment of young jack pine and trembling aspen trees" @default.
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- W2050495596 doi "https://doi.org/10.1016/0378-1127(89)90123-0" @default.
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