杉木不同育苗方式苗木生长差异分析

Difference Analysis of Seedling Growth of Cunninghamia Lanceolata in Different Nursery Methods

在提升杉木(Cunninghamia lanceolata)轻基质容器育苗方法的基础上,从生长量、生物量,生长量区间分布,苗木质量等级评价以及根系生长状况等方面,探究1年生杉木实生轻基质容器苗和裸根苗的生长差异。结果表明:轻基质容器苗的平均苗高、平均地径分别为40.87、0.50 cm,均达到Ⅰ级苗出圃标准;裸根苗平均苗高43.35 cm,达Ⅰ级苗出圃标准,平均地径0.54 cm,仅达到Ⅱ级苗出圃标准。轻基质容器苗和裸根苗苗高分别有73.3%、74.2%分布在30~50 cm范围,苗高分布差异较小;轻基质容器苗地径有78.0%分布在0.3~0.6 cm范围,裸根苗仅为62.4%,说明轻基质容器苗地径生长更加均匀。轻基质容器苗侧根数量以及根冠比显著高于裸根苗,有利于提高造林成活率。采用沙床培育,可获得高质量等级和高出圃率的杉木轻基质容器苗。

On the basis of promoting container nursery with light substrate of Cunninghamia lanceolata,the growth differences between 1-year-old container and bare-rooted seedlings of Chinese fir were studied from the growth,biomass,interval distribution of growth,the evaluation of seedling quality and the growth status of root system.Results showed that the average height and ground diameter of light medium container seedlings were 40.87 cm and 0.50 cm,respectively,which all reached the standard of Grade I seedlings.The average seedling height of the bare-rooted seedlings(43.35 cm)reached the standard of the grade I seedlings,and the average ground diameter(0.54 cm)only reached the level II seedlings.73.3%of light medium container seedlings and 74.2%of bare-rooted seedlings distributed in the interval of 30 cm^50 cm.The difference of height distribution was small.78.0%of light medium container seedlings and only 62.4%of bare-rooted seed?lings distributed in the interval of 0.3 cm^0.6 cm,which indicated that the ground diameter of light medium container seedlings grew more evenly.The number of lateral roots and root-shoot ratio of light medium contain?er seedlings were significantly higher than those of bare-rooted seedlings,which was beneficial to increase the survival rate of afforestation.The use of sand bed cultivation could obtain high quality and nursery rate of Chinese fir light medium container seedlings.