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Individual-based Competition Analysis for Secondary Forest in Northeast China  

Li, Fengri (School of Forestry, Northeast Forestry University)
Chen, Dongsheng (School of Forestry, Northeast Forestry University)
Lu, Jun (School of Forestry, Northeast Forestry University)
Publication Information
Journal of Korean Society of Forest Science / v.97, no.5, 2008 , pp. 501-507 More about this Journal
Abstract
The data of crown width with 4 directions, DBH, tree height, and coordinate for sample trees were collected from 30 permanent sample plots in secondary fore st of the Maoershan Experimental Forestry Farm, Northeast China. In this paper, the competition of individual trees in stand were discussed for secondary forest by using iterative Hegyi competition index and crown overlap index that represented the competitive and cooperative interactions among neighboring trees. Active competitors of subject tree in the competition zone were selected to calculate the iterative competition index. Using the results of crown classification based on the equal crown projection area, a new distance dependent competition index called crown overlap index (COI) was developed for secondary forest. The COI performed well in describing the crown competition rather than crown competition factor (CCF). The individual-based competition index discussed in this paper will provide more precise for developing individual tree growth models for secondary forest and it can also use to adjust the stand structure for spatial optimal management.
Keywords
iterative hegyi competition index; crown class; crown overlap index; competition zone radius;
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