广西速丰桉林分二元材积生长率表研制

A Study on Two-Way Tree Volume Growth Ratio Model of Eucalyptus in Guangxi

速丰桉一年四季生长,没有明显年轮的特征,难以对单株木进行树干解析确定林木生长量。在没有足够数量的固定标准地连续定期监测数据的情况下,采取临时标准地年龄序列的调查方法,选用适当模型结构,再通过引进可变参数改进生长模型,建立以年龄、胸径为基础的林分材积生长率模型,并编制广西速丰桉林分二元材积生长率表。经检验,方法可行,预估精度满足林业数表建模要求,可应用于速丰桉林材积生长量的预估。

Eucalyptus grows in every season, and there are not obvious growth tings in the trunk of Eucalyptus. It is very difficult to analyze the tree volume increment of Eucalyptus by mensurating the growth rings. Under the condition that we could not obtain enough data of continuous periodical mensuration of settled sample plots, the method of mensurating temporary sample plots with different age was used. And, we chose appropriate model structure, and we changed model structure with variable parameter, finally two-way tree volume growth ratio model of Eucalyptus was established, The result of test of the model shows that this method of modeling is feasible, and the precision of estimation satisfies with the prescription of modeling forestry tables. This growth ratio model can be used to estimate the tree volume increment of Eucalyptus.