香椿地理变异与种源选择

对两片种源试验林9 a调查资料系统地研究,结果表明:香椿种源的地理变异基本上是与纬度相平行的南北倾斜的连续变异型式。在试验地区,参试的27个种源以浙江丽水,湖南邵阳、永顺、加禾、桃江,福建建阳种源生长最好,安徽太和、无为,湖北红安,陕西勉县等种源生长最差。选择优良种源,在8～9年生时,树高可获遗传增益16.3％～26.8％,胸径18.9％～40.0％,材积44.7％～99.1％.香椿种源的早期选择一般可从4年生开始。通过树高、胸径、冠长对材积进行相关选择,选择效率可达90.0％～99.0％以上。

Geographic Vari-ation and Provenance Selection of Chinese Mahogany.

This paper analyses the data for 9 years obtained from two tested plantations of Chinese mahogany. The results indicated that the geographic variation of Chinese mahogany provenance was basically a south-north cline pattern that was parallel to latitude. Among the 27 provenances investigated, provenance Lishui (Zhejiang), Shaoyang, Yongshun, Jahe, Taojiang(Hunan) and Jianyang (Fujian) showed the best growth. The provenance Taihe, Wuwei (Anhui), Hongan (Hubei), Miangxian (Shanxi) showed the worst. The genetic gain for tree height was 16.4%-26.8%, for diameter at breast height 20.2%-41.8%, for volume 47.0%-102.9% at 8-9 years old. The early selection of Chinese mahogany provenance could usually start at 3 or 4 years old. Indirect selection for volume through tree height, diameter at breast height and crown length could hit 90.7% 99.7% of selective efficiency.