Genetic Variation of Wood Properties and Superior Provenance of Larix olgensis Provenance in Liangshui Forest Farm

The tree height, DBH, timber volume, wood density, crushing strength parallel to grain, bending strength, MOE, the hardness of tangential section, the hardness of diametral plane, the hardness of end surface were analyzed for the superior provenances selection of 31-year-old Larix olgensis from 11 provenances sited in Liangshui forest farm. To select superior provenances, we estimate the variation coefficient and correlation coefficient of L.olgensis. The results showed that tree height (4.90%) and DBH (7.64%) has small variation coefficient. Other characters have rich variation (above 10%). The hardness of diametral plane has the biggest variation coefficient (23.59%). The results showed that the correlation between tree height, DBH and timber volume among families were significant or extremely significant and positively correlated. The wood density is significantly or very significantly and positively correlated with most mechanical properties. The correlation among most mechanical properties is significantly or very significantly and positively correlated. Combined with the result of principal component analysis, Muling, Jixi, Xiaobeihu were selected as the superior provenances.