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来自广东省龙山林场杉木第二代种子园的39个自由授粉家系参加了1998年多点子代测定和2001年单点子代测定试验,结果表明:11年生子代测定林的树高、胸径、单株材积在家系和地点间差异达到极显著水平(P<0.01),8年生子代测定林生长性状的差异较小;家系平均树高、胸径、材积遗传力分别为0.24、0.26、0.30,主要生长性状受中等偏下的遗传力控制;第二代种子园材积遗传增益在1.88%～5.85%,其遗传增益和现实增产效果高于1.5代种子园,也高于初级种子园。对11年生多点子代测定林家系进行了丰产稳定性分析,选择出广谱丰产稳定家系5、8、17、19、23、26、28号,平均单株材积比群体均值提高3.39%;丰产家系3、7、15、21号和家系20、22、25号,分别适合龙山林场和曲江林场及相似立地条件地区限制性推广利用,平均单株材积比群体均值分别提高9.91%和4.89%;8年生单点子代测定林,以单株材积高于群体均值作为入选标准,有1、2、4、6、7、8、10、11、12、14、15、19等12个家系入选,平均单株材积比群体均值提高6.76%。
Thirty-nine free-pollinated pedigrees from the second generation seed orchard of Chinese fir in Longshan Forest Farm of Guangdong Province participated in the multi-progeny determination in 1998 and the single-point progeny determination in 2001. The results showed that the tree height, DBH, The differences of plant height between the pedigree and the locus reached extremely significant level (P <0.01). The differences of growth traits of 8-year-old offspring were less significant. The mean tree height, DBH and heritability of pedigree were 0.24,0.26,0.30, The growth traits were controlled by middle-lower heritability. The genetic gain of second-generation seedlings was 1.88% -5.85%, and its genetic gain and actual yield increase were higher than that of 1.5-year seed orchard. The analysis of high yield stability of 11-year-old multi-offspring progenies Lin family was carried out, and the broad-spectrum stable and stable pedigree 5,8,17,19,23,26,28 was selected. The average single plant volume increased by 3.39% Family 3,7,15,21 and family 20,22,25 were suitable for the restricted promotion and utilization of the Longshan Forest Farm and Qujiang Forest Farm and similar site conditions respectively. The average single plant volume ratio increased by 9.91% and 4.89% ; 8-year-old single point progeny test forest, single plant volume higher than the population mean as the selection criteria, 1,2,4,6,7,8,10,11,12,14,15,19 12 other families included , The average single plant volume increased 6.76% than the population mean.