木荷苗高生长期划分的有序样本聚类分析

摘要

以一年周期内木荷苗高每15 d 的净生长量为样本，采用有序样本聚类分析方法，将木荷苗高生长过程采取了科学定量划分为4个时期：出苗期为4月10日～4月30日，幼苗期为5月1日～7月15日，速生期为7月16日～11月15日，生长后期为11月16日～12月30日。速生期的苗高净生长量占苗木全年总生长量的71．3％，而幼苗期、生长后期的净生长量分别仅占全年总生长量的19．5％和2．1％，结合木荷苗木生长发育特性，提出了各期的关键育苗措施，以期为培育木荷优质壮苗提供参考。%Taking net increment of every 15 dfrom a one - year - cycle seedling height of Schima superba as sample , using cluster analysisof ordered sample method ,the Schima superbaseedling height growth process was divided into four periods :the seeding periodfrom April 10th to April 30th ,seedling period from May 1st to July 15th ,fast -growing period from July 16thtoNovember15th ,and late growth stage from November 16thto December 30th .Net growthof seedling heightinfast - growing period accounted for 71 .3% of the total growth ,while the net growth inthe seedling periodand the late growth periodaccounted for 19 .5% and 2 .1% respectivelyoftotal annual growth .In combi‐nation with Schima superba seedling growth characteristics ,we put forward the key measures of seedling in every pe‐riod ,to provide theoretical basis for qualified seedling cultivation of Schima superba .