肯氏南洋杉实生苗培育技术及苗木质量分级

选择生长健壮的30～60年生成年肯氏南洋杉Araucaria cunninghamii母树进行采种，播种前种子去皮处理，幼苗期加强水肥管理和病虫害防治以提高实生苗苗木质量。以根长、地径和苗高为肯氏南洋杉1、2年生实生苗分级的质量指标，应用快速聚类法K-Means分别进行聚类分析，将苗木分为3级。1年生实生苗苗高(≤12 cm)、地径(≤2.5 cm)过小，不适合出圃造林； 2年生实生苗中的Ⅰ级苗和Ⅱ级苗根长、地径、苗高指标均符合出圃造林标准，可以出圃; 2年生实生苗中Ⅲ级苗地径、苗高依然未达到出圃标准，不建议出圃。

Cultivation Techniques and Quality Grading for Seedlings of Araucaria cunninghamii

In order to obtain high quality seedlings of Araucaria cunninghamii, the seeds were collected from 30—60 year-old robust mature trees. At the seedling stage, watering, fertilization, diseases and pests control were paid great attention. With the seedling height, root length and the ground diameter as the indexes, the 1-year-old and 2-year-old seedlings of A. cunninghamii were divided into three quality classes using the SPSS K-means clustering. The height and the ground diameter of the 1-year-old seedlings and third class of 2-year-old seedlings were too short to be outplanting. The first and second classes of the 2-year-old seedlings were suggested to be outplanting.