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- Title
Evaluation of distance-independent competition indices in predicting tree survival and diameter growth.
- Authors
Sun, Shuaichao; Cao, Quang V.; Cao, Tianjian
- Abstract
Competition indices play a significant role in modeling individual-tree growth and survival. In this study, six distance-independent competition indices were evaluated using 200 permanent plots of loblolly pine (Pinus taeda L.). The competition indices were classified into three families: (1) size ratios, which include diameter ratio and basal area ratio; (2) relative position indices, which include basal area of larger trees (BAL) and tree relative position based on the cumulative distribution function (CDF); and (3) partitioned stand density index and relative density. Results indicated that different families of competition indices were suitable for different tree survival or diameter growth prediction tasks. The diameter ratio was superior for predicting tree survival, whereas the relative position indices (BAL and CDF) performed best for predicting tree diameter growth, with CDF receiving the highest rank.
- Subjects
TREE mortality; TREE age determination; SELECTION indexes (Plant breeding); CUMULATIVE distribution function; BASAL area (Forestry)
- Publication
Canadian Journal of Forest Research, 2019, Vol 49, Issue 5, p440
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/cjfr-2018-0344