秃杉苗高生长期划分的有序样本聚类分析

The Classifications of Seedling Height Growth Process of Taiwania flousianawe Gaussen by the Sequence Sample Cluster Analysis

以秃杉苗高15d的净生长量为样本,采用有序样本聚类分析方法,将秃杉苗高生长过程划分为4个时期:出苗期(3月1日～5月31日)、幼苗期(6月1日～7月31日)、苗高速生期(8月1日～10月31日)、苗木生长后期(11月1日～11月30日),其中苗高速生期的高生长量占全年生长量的64%。根据各时期苗木生长的特点,提出了各时期的管理措施,为培育秃杉优质壮苗提供依据。

The seedling height growth process of Taiwania flousianawe Gaussen were classified by the Sequence sample cluster analysis.The results indicate that the seedling height growth process of Taiwania flousianawe Gaussen can be divided into four stages:juvenile stage(March 1～ May 31);early growth stage (June 1～July 31);rapid growth stage(August 1～October 31);and late growth stage(November 1～November 30).The height growth increment in rapid growth stage accounts for 64% of the total growth increment.Since the rapid growth stage is just in the hot summer,it is very important to solve the contradiction between the supply of water and fertilizer during this growth stage.The management measures for each growth stages are put forward for cultivating higher-quality seedlings according to the seedling growing process of Taiwania flousianawe Gaussen.