Abstract:

According to the 6-year-old data of Alnus cremastogyne, the experiment analysis has been made for dry trunk weight of single tree of the 15 provenances and 51 families in 3 sites. It proved that the means of dry trunk weight was 6.15 kg. There was significant difference among provenances and families in dry trunk weight, meanwhile, the interaction between provenance and site, family and site in dry trunk weight was statistically significant. Genetic parameter analysis showed that provenance heritability and family heritability of dry trunk weight were 0.27～0.75, 0.17～0.83, respectively, and showed that dry trunk weight of A. cremastogyne was genetically controlled in moderate to strong degree, so it was feasible to improve the dry trunk weight of A. cremastogyne. Dry trunk weight was the most suitable index to show production efficiency of A. cremastogyne pulp wood plantation. The direct path coefficient of volume was highest (0.791) to dry trunk weight. The next was height (0.396) and wood density (0.256). Tree height,DBH and crown range had effects on dry trunk weight indirectly. The best five provenances from Sichuan Province, which were Yanjing of Jintang, Huaikou of Jintang, Muchuan, Qionglai and Yanting, have been selected on the basis of combined index.

Key words: Alnus cremastogyne, provenances, dry trunk weight of single tree, genetic variation, provenance selection