秦岭太白红杉林分布及太白山高山林线特征的定量分析

采用正交试验设计在秦岭太白山设置了12个太白红杉林分,用样方方法对太白红杉种群进行了调查,用正交分析法和"DataProcessingSystem"数据处理软件对影响太白红杉林分布的5个生态因子进行了分析。结果表明:5个生态因子中,海拔梯度的变化是影响太白红杉林分布的主导因子,5个生态因子在影响太白红杉林分布中的作用地位是:海拔>坡度>土壤厚度>坡向>风向。并对描述太白红杉林的5个指标进行了主成分分析,并对高山林线进行了定量描述,胸高直径是描述太白红杉林的主要成分,海拔3400m是太白山太白红杉郁闭林的上限。

Quantitative Analysis of the Larix chinensis Forest's Distribution at Qinling Mountains and the Character of the Alpine Timberline at Taibai Mountain

At Taibai Qinling Mountain 12 Larix chinensis population stands were set up using the idea of the Orthogon experimental design.Stands were investigated by sampling method.5 ecological factors influencing forest's distribution were analyzed by Orthogon analytic approach and "Data Processing System" data processing software.The results showed that the change of the altitude gradient is the leading factor influencing the forest's distribution of Larix chinensis and their function position in affecting the distribution of Larix chinensis forest is the altitude>slope gradient>soil thickness>slope aspect>wind direction.This paper also analyzed the 5 index in describing Larix chinensis forest and quantificationally described the alpine timberline at Taibai Mountain.The breast-height diameter is a main composition of describing the forest of Larix chinensis,3 400 m altitude is the upper limit of the closing Larix chinensis forest of Taibai Mountain.