舟山新木姜子苗木分级及不同密度试验

以苗高和地径作为苗木分级的质量指标,对舟山新木姜子一、二年生苗木进行逐步聚类分级,得出一年生苗木分级标准为:Ⅰ级苗苗高≥19.7 cm,地径≥0.38 cm;19.7 cm>Ⅱ级苗苗高≥13.8 cm,0.38 cm>地径≥0.30cm;Ⅲ级苗苗高<13.8 cm,地径<0.30 cm.二年生苗木:Ⅰ级苗苗高≥49.1 cm,地径≥0.59 cm;49.1 cm>Ⅱ级苗苗高Ⅰ≥29.5 cm,0.59 cm>地径≥0.38 cm;Ⅲ级苗茁高<29.5 cm,地径<0.38 cm.应用分级标准对3种育苗密度的苗木进行分级.并通过不同密度与苗高、地径的方差分析,结果表明,培育一年生舟山新木姜子苗木最适密度为300株/m2,二年生苗木的最适密度为200株/m2.

Seedling Grading and Experiment on Seedling Cultivation with Different Density of Neolitsea sericea

Gradual cluster analysis on 1-2 year seedling of Neolitsea sericea, taking seedling height and ground diameter as grading indicators resulted that ground diameter and height of the first-grade for 1-year seedling was 0.38cm and 19.7cm, those of the second-grade ones >0.30 cm and 13.8cm-19.7cm, and those of the third-grade ones<0.30cm and <13.8cm. Ground diameter and height of the first-grade for 2-year seedling was 0.59cm and 49.1cm, those of the second-grade ones 0.38-0.59cm and 29.5cm-49.1cm, and those of the third-grade ones<0.38cm and <29.5cm. Analysis of variance on density, seedling height and ground diameter demonstrated that the best density for 1-year and 2-year seedlings was 300 and 200 trees per square meter.