sum of years digits method

In this paper, through ring dating information to analysis the stand structure of natural fire disturbance, and then uses Dendrochronology ring index as indicators, applies methods including mutation analysis,growth release analysis and comparative analysis to analyze the influence on DBH growth of major component species including Larix sibirica Ldb.

本文通过年轮的定年信息对自然火干扰林分结构进行了分析,进而以树轮年代学年轮指数为指标,采用突变分析、生长释放分析和对比分析的方法,分析了火干扰对新疆喀纳斯泰加林主要组成树种西伯利亚落叶松(Larix sibirica Ldb。

The thesis analyzes three types of universal reference,they are arbitrary reference, seriatim reference and polarity reference.

文中主要分析“任指”、“逐指”、“极指”三种类型。