杉木2代种子园单亲子代试验

杉木（Cunninghamia lanceolata（Lamb．）Hook．）是我国的主要造林树种，广泛分布于长江、珠江流域14省（区）亚热带地区，每年木材产量约是全国商品材产量的1／5到1／4，20世纪90年代年造林面积40万hm^2左右。约占我国人工林面积的1／10。杉木育种虽取得很大成绩，但还不能满足生产上对良种的需求。为了满足生产上的需要，加快林木良种建设步伐，提高良种的遗传增益，作者在杉木1代种子园建立的基础上，于1992年起开展了杉木高世代（即2代）种子园建立技术的研究；同时，于1997—1999年连续3a进行了杉木2代种子园单亲子代林的测定研究。

Study on Filial Generation of Single Parent in Second-generation Seed Orchards of Chinese Fir

The height and DBH of 5 to 7-year trees of filial generation of single parent were tested and analysed in 1997-1999 in second generation seed orchard of Chinese fir(Cunninghamia lanceolata(Lamb.)Hook) in Changle Forestry Center.The results showed that the growth traits of height and DBH were most significantly different among the tested families.The heritabilities of height and DBH of families different years in were 67.02%、73.41%、54.95%、59.18%、55.48% and 47.37% respectively.The genetic gain of families of plus tree of superior provenance and hybrid match was more than that of the families of plus tree of superior families of first generation seed orchard of Chinese fir.The genetic gain of second generation seed orchard was more than that of the filial generation of superior provenance and mixed families filial generation of first generation and 1 and(1.5) generation seed orchard.The selection was effective on material of second generation of Chinese Fir and the second generation seed orchard rebuilding was successful.