杉木人工林自疏过程密度变化分析方法的研究

采用二次正交旋转组合设计方法 ,建立了影响杉木自疏的海拔、坡位及林分平均胸径与杉木人工林自疏过程密度变化关系的数学模型 ,结果表明林分平均胸径对杉木人工林自然稀疏存在极显著影响 ,坡位与林分平均胸径的交互作用对自疏存在显著影响 .运用遗传算法优化了模型参数 ,在检验模型适应性的基础上应用计算机模拟技术 ,分析了杉木人工林自疏过程密度变化随坡位及林分平均胸径变化的内在规律 ,为杉木人工林密度定量管理提供了科学基础

A Study on the Analysis Method of Density Change During Self-thinning for Cunninghamia lanceolata Plantation

Using quadratic orthogonal rotation design, this paper established a mathematical model of density change during self thinning for Cunninghamia lanceolata plantation, which related to the altitude, situation of slope and mean diameter at breast height. The results showed that mean diameter at breast height effected on density change for Cunninghamia lanceolata plantation far significantly, and the inter effective between situation of slope and mean diameter at breast height had significant effect on density change for Cunninghamia lanceolata plantation. Then the authors optimized model's parameters by genetic algorithms, and analyzed the inner law of density change during self thinning for Cunninghamia lanceolata plantation following the change of situation of slope and mean diameter at breast height using computer simulating technique. This study would provide scientific base for density management of Cunninghamia lanceolata plantation.