西藏色季拉山急尖长苞冷杉生长规律研究

为了合理保护和培育急尖长苞冷杉珍稀资源,以急尖长苞冷杉解析木资料为基础,借助Logistic模型,运用SPSS软件进行回归分析,对西藏色季拉山急尖长苞冷杉的生长规律进行了定量研究。结果表明,应用Logistic模型建立的急尖长苞冷杉的树高与胸径的生长模型拟合效果显著,相关系数皆在0.997 0以上;运用有序样品聚类法将胸径和树高2个表现生长过程科学地划分为前慢期、速生期和后慢期3个阶段,实现了胸径和树高二维有序样品的聚类,不仅反映出急尖长苞冷杉生长的综合节奏性,而且为龄组划分提供了依据;生长曲线表明,胸径和树高的连年生长量最大值出现在60年左右,在90年时又达最大值,之后,随着树龄的增长略呈波动变化,说明在其生命周期内有2个速生期,分别是在树龄35~65和80~110年,可用于指导间伐抚育期。此外,还以Logistic模型为基础,以时间因子为媒介,推导出一个能准确地描述急尖长苞冷杉D-H关系的新模型——Logistic衍生模型。

Study on Growth Rhythm of Abies smithii in Sejila Mountain in Tibet

In order to reasonably protect and cultivation Abies smithii resources,based on the Abies smithii analysis data,using Logistic model and SPSS software,a quantitative study of growth rhythm of Abies smithii in Sejila Mountains was conducted.The results showed that the fitting effect of the model of growth of diameter and height was significant,Their related coefficient was above 99%;diameter and height was divided into 3 stages which including first slow,fast growing and latter slow by using using method of ...