An Improvement to Competition Index Calculating Algorithm for an Individual Tree Model

The algorithms of estimating competition index was divided into two groups according to its competition tree searching regimen, and one of them was improved. Then, two new searching algorithms were created, which operate well for stand with various spatial patterns. Introducing an independent index system makes a computer model restructured easily. With new and improved algorithm, a system can get a stand growth simulation done in a dramatically shorter time than it used to. One of the staggering problems, unendurable of implementing time, which had been an obstacle to the application of individual tree model, was overcome. The equations were provided to access extra RAM demand and calculate the implementing time.