0.08109188079834114147RMRSOTHERPublished to Web1Publication2Informally Refereed (Peer-Reviewed)53Miscellaneous Publication<![CDATA[Effects of competitor spacing in a new class of individual-tree indices of competition: semidistance-independent indices computed for Bitterlich versus fixed-area plots]]> 2008-1We illustrate effects of competitor spacing for a new class of individual-tree indices of competition that we call semi-distance-independent. This new class is similar to the class of distance-independent indices except that the index is computed independently at each subsampling plot surrounding a subject tree for which growth is to be modelled. We derive the effects of distance for this class as the expected value over independent samples containing a particular subject tree. In a previous paper, we illustrated distance effects implicit in eight indices of the distance-dependent class. Here, we present distance effects of four semi-distance-independent indices: density, sum of diameters, basal area, and tree-area ratio; each determined for small fixed-area plots of 0.04ha and for Bitterlich samples of 6m2·ha-1. We show that several members of this new class have distance effects very similar to the distance-dependent class and should, therefore, be equally effective in accounting for competitive effects in individual-tree increment models. The comparisons should inform selection of competition indices and sampling designs for growth modelling.https://www.fs.fed.us/rm/pubs_other/rmrs_2008_stage_a001.pdf685 KBhttps://www.fs.usda.gov/treesearch/pubs/30641306410Canadian Journal of Forest Research. 38: 890-898.0T0Stage, Albert R.; Ledermann, Thomas; 20-AUG-2008 12:48:51AY36Wildlife (or Fauna)Stage, Albert R.001Ledermann, Thomas002Stage, Albert R.001Ledermann, Thomas002This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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