Study on the Variation of Wood Basic Densities of Chinese Fir

By the use of technology of genetic improvment,the tests have been collected 24 provenances in low hill area(Jurong,Jiangning)of its northern distribution:50 offsprings of elite trees of half-sib families of native provenance in Jiangsu;490 trees of the offsprings of hybrid groups of 17 elite provenances;plantation fields were 3 groups of mountain valley,hillside and gully;Plantation densities were 3 000 trees.hm-2,4 950 trees.hm-2 and 6 000 trees.hm-2;and 5 age group tests with 275 trees were 6,8,10,15 and 18 year-old. Research results showed that among the provenances of Jiangsu,offsprings of half-sib families and elite of wood character of offspring of hybrid groups had singnificant genetic variance.The wood of basic densities of young trees of elite of Rongshui provenance didn’t have obvious effect among plantation field tests;age and plantation densities(3 000～6 000 trees.hm-2)are the important factors,causing the variance of wood basic densities of Chinese fir.The wood basic densities of Chinese fir and growth characteristics generally didn’t have negative genetic relationship.The improvement of wood character or growth and co-improvement of wood character can all be done by the two stage independent selection.Research results provided the foundation to select and breed elite character and high yield Chinese fir.