摘要
以柠条的净高生长量为样本，应用有序聚类法，对柠条的苗高生长期进行划分，结果如下：１．出苗期（４月２２日～５月１２日）：２．幼苗期（５月１３日～６月２０日）；３．速生期（６月２１日～７月３０日）１４．硬化期（７月３１日～９月１０日）。苗木的速生期较短，但全年高生长的７０．８％是在该期内完成的，因而，该期的水、肥、光、热等合理调节措施是苗高生长的重要保证。
Based on the samples which are net height growth of caragana korshiiiskii,theheight growth process of annual seedling is analysed by the Sequence Cluster Method.Theresults showed that the growth process can be divided into 4 stage:1. Preemergence(April22～May , 12);2.Seedling stage(May, 13～June,20);3.Rapid growth stage(June,21～Ju-ly,30);4.Hardener stage(July,31～Sep.10).Rapid growth stage takes shorter time,but theincrement accounts for 70.8% of all year's increament.The suitabie management on water,fertilizer,heat and light in fields is important guarantee for seedling growth.
基金
国家自然科学基金
关键词
柠条
苗高生长期
有序聚类
Caragana korshinskii
growth stage of seedling height
the Sequence Cluster niethod
