Study on the Genetic Variations of HalfSib Progeny Testing and Excellent Family Selection of Liquidambar formosana

The indexes including differences and genetic characteristics of growth traits were investigated in 6yearold 125 halfsib progeny test plantations introduced from 19 kinds of national Liquidambar formosana provenances by secondary split plot design,and then selected fine family.The results showed that difference of DBH(diameter at breast height),volume,tree height,crown growth traits were extremely significant, there was a richer variation in Liquidambar formosana half sib families whose coefficient of variation reached 4004% in the maximum,and therefore,they demonstrated that the breeding potential was existed.The Family heritability was higher than the individual heritability,when the indexes of DBH,tree height, volume and family heritability were commanded by the moderate genetic.The positive correlation among all growth traits reached extremely significant,and the correlation coefficients were all above 070.Based on volume,with DBH and tree high,supplemented by,selected 51 pedigrees in 125 families.Among of them,the elite families were 3,excellent homes were 4 and good homes were 44.The number of the best home was Songzi 09.It’s DBH,volume,tree height,the average value for 585cm,000711m3,and 490m,and left transfer gain was 2052%,6570% and 1488%,respectively.