檫树种源选择与遗传增益

Provenance Selection and Genetic Gain of Chinese Sassafras

本文对2块试验林9a的调查结果系统地进行了分析研究。研究表明,擦树种源的早期选择,可以从4年生开始,在1～3年生时,不宜进行选择。在参试的21个种源中,以广东龙川、江西赣州和湖南平江种源最好。在试验地区(临安)选用这3个优良种源,与当地种源相比,在8～9年生时,树高遗传增益可获得23.3％～55.4％,胸径可增益16.3～30.9％,材积55.3％～133.5％,高径比5.9％～13.6％。

This paper analyses and researches the test data for 9 years which came from two plots of test stand in Lin'an County, Zhejiang Province. The results indicate that Sassafras tsumu provenance is not suitable for selection at 1～3 years old, and its early selection should begin at 4 years old. The provenances in Longchuan (Guangdong Province), Ganzhou (Jiangxi Province), and Pingjiang (Hunan Province) are better than others in the 21 provenances tested. These three good provenances are selected to the test area in Lin'an County, and compared with local provenance. At the age of 8～9, the genetic gain of tree height, diameter breast height, volume and height/diameter ratio range from 23.3% to 55.4%, 16.3% to 30.9%, 55.3% to 133.3% and 5.9% to 13.6%, respectively.