关键词: 杉木人工林, 林分密度, 优化, 模型

Abstract: DENTROL(DENsity conTROL model) is a computer model for the opti-mization of stem densities of Chinese fir plantations, which is based on theNational Experiments of Planting Density, and Tending and Thinning ofChinese Fir Plantations, and referencing to the New National ManagementTable of Chinese Fir Plantation, and formed according to distribution zone,distribution area and site indexes. The concept of the optimization of densitycontrol is the selection of a series of elements concerning stem density of astand, including initial planting density, year of first thinning, thinning intensity, times of thinning, ages of harvesting, and planting aim, from whichthe final internal return rate (IRR) will be maximum or so. Data from 12plots in Tending and Thinning Experiment were used to test the accuracy ofthe model in predicting stem growth. The results showed that the standarddeviation was +/8.9%, the systemic error was 1.8%, which are enoughfor the demand of forestry production practice. According to calculations,based on the plantation of the whole country, the average net present valueper hectare of plantation managed with optimized stem density will increase(?)321. 7, bu 17.0% , and which will increase (?)892. 4, by 47.3% , if only basedon the main commercial timber base——the distribution area of Chinese firplantation.

Key words: Chinese fir plantation, Stem density, Optimization, Model