沿海地区楸树无性系幼林对比测定及选择研究

Comparative Observation and Clones Choosing of Tow-year Catalpa bungei Clones Forest in Coastal Area

为筛选出适合中国东部泥质海岸的优良楸树无性系，以‘豫楸1号’（YQ1）无性系为对照，研究了2年生28个无性系的生长情况，并通过聚类分析筛选出优良楸树无性系。结果发现，无性系胸径变化范围在3.24~5.24 cm，平均为4.13 cm；树高变化范围在3.48~5.18 m，平均为4.34 m；其中9个无性系的胸径和6个无性系的树高大于对照YQ1（胸径和树高分别为4.02 cm、4.29 m）。方差分析发现，无性系间胸径和树高均存在显著差异。采用胸径和树高2个生长指标对所有无性系进行聚类分析，29个无性系可明显的划分成4类，且各类间两指标均存在显著差异。筛选出无性系008-1-3具有最大的胸径和树高；筛选出4-2-2-5、4-2-6-8、4-2-8-3和6523-4等4个无性系具有较大的胸径和树高，这5个楸树无性系可作为今后沿海地区重点推广的楸树无性系。

Twenty-nine Catalpa bungei clones, including 28 new test clones and one control, YQ1, were induced to choose fine clones in coastal area in Jiangsu Province. Growth indices, such as diameter at breast height （DBH）, height （H）, were monitored in a 2-year-old Catalpa bungei test forest. The range was 3.24-5.24 cm, with the mean of 4.13 cm, for DBH, and 3.48-5.18 m, with mean of 4.34 m for H, for all 29 clones. There were 9 clones for DBH, and 6 clones for H, were higher then YQ1. 29 clones were clustered to 4 groups through cluster analysis, and significantly differences were found among these 4 groups for DBH and H. 008-1-3, with highest DBH and H, was found to be the best clones, and 4-2-2-5, 4-2-6-8, 4-2-8-3 and 6523-4 were also chose out due to higher DBH and H. These 5 clones could be planted in coastal area.