【摘要】 本文根据南岭山地湖南、广东等省5个林场的25块杉木人工林林分生长过程解析(以下简称林分解析)标准地资料(已验证了原有生长过程表中株数随林分平均直径的变化规律的可靠性)。通过株数标准化方法,将经消除间伐影响后的各标准地林分蓄积量生长过程数据,转化到标准水平(郁闭度1.0)。再将改进的8参数Chapman-Richards函数,用Marquardt迭代法,建立了以地位指数和年龄为解释变量的多形标准蓄积量收获模型,同时分析了模型的特性,为立地质量的蓄积量指标评价提供了依据。更多还原

【Abstract】 A standard volume yielding model was established on the basis of an analysis of the data of growth process of 25 Chinese Fir stands in 5 forest farms in Nanling Mountain Area, Hunan and Guangdong Provinces. The model was used to prove that the rule of stem number changing with the mean diameter of the stand in original growth process table is reliable. Based on this, through adopting the method of standardizing the stem numbers, all the volume data of different plots in the growth process table, after eliminating the influence brought by thinning, were changed into standard level (canopy density = 1.0). Then, analyzed by an improved 8 parameters Richards function and Marquardt iteration, a polymorphic standard yielding model, which took site index and age as the interpreting variables, was established. All the related properties of the model were discussed and the result was satisfactory. It supplies a foundation for site quality evaluation using index of volume.更多还原