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根据国内外14个树种的16份生长过程表计算出最高、最低立地等级在各龄阶树高的差值(树高曲线的间距)和其中76个立地等级在各龄阶的树高年生长量。从而总结出这样的规律:1、绝大多数生长过程表(81.2％)最高、最低树高曲线的差值随年龄的增加而逐渐扩大呈喇叭形。2、在76个立地等级中绝大多数立地等级高的(90％以上)其树高年生长量大于立地等级低的。对编制地位指数表导算各指数级树高曲线值常用的相对树高(或移轴法)和树高变异系数调整法进行试验后,发现后者可能导致树高生长量与上述一般规律不一致的反常现象。笔者认为是由于树高变异系数变化幅度较大引起的。针对少数同行者的不同看法,经进一步的分析探讨,笔者仍认为对树高变异系数变化幅度较大的树种在导算方法上应慎重,以采用相对树高法较适宜。如采用其它方法,应对树高生长量进行分析。
Based on the 16 growing process tables of 14 tree species at home and abroad, the difference of tree height (distance between tree height curves) and the tree height growth of 76 site classes at different ages were calculated the amount. To summarize the law: 1, the vast majority of the growth process table (81.2%) the highest, the difference between the lowest tree height curve with the increase of age gradually expanded was flared. 2. The vast majority of the 76 site rankings have high site rank (over 90%) and their annual tree growth rate is higher than the low site rank. The relative tree height (or in-line method) and tree height coefficient of variation (CVT) method commonly used in the indexing of the index tables of tree species for index construction have been tested and found that the latter may lead to inconsistent growth of tree height with the above general rule The anomaly. The author thinks it is due to the larger variation of tree height variation coefficient. According to the different views of a few peers, after further analysis and discussion, I still think that the variation of tree height variation coefficient of trees should be careful in the calculation method, and the relative tree height method is more appropriate. Such as using other methods, tree height growth should be analyzed.