【摘要】 对杉木68个杂交组合7~10年生试验林的杂种优势进行分析,结果表明树高、胸径和材积高于父本和母本的自由授粉子代平均值的组合比例总体上在50%左右;3个生长性状的正向超亲、负向超亲以及介于双亲之间的组合比例,各测定林间差异很大,总体上来看,树高正向超亲略占优势,胸径及材积负向超亲略占优势;树高、胸径、材积的杂种优势分别为-37.5%~14.3%、-39.4%~17.2%和-58.6%~74.1%,材积杂种优势变幅明显大于树高及胸径,3个生长性状各杂种优势区间的组合比例呈正态分布,树高、胸径杂种优势大于10%组合比例分别占8.8%和5.9%,材积杂种优势在30%~60%、60%以上组合比例分别为5.9%和2.9%;通过人工育种培育具有超双亲优势的组合是可行的,在地理间隔较远的优良种源间,或在外省优良种源与本省种源间选择交配亲本,易培育出具有超双亲优势的组合。更多还原

【Abstract】 The hetersis analysis of 7～10-year-old chinese fir plantation in 68 hybrid was carried out in this paper,the results showed that ratio of hybrids which were greater than parental open-pollinated sibs in height,DBH and Volume was about 50%;the hybrids were divided into three groups,including those plus surperior to two parents,open-pollinated sibs,those negetive superior to two parents,open-pollinated sibs and those between two parents,open-pollinated sibs in three growth traits,the ratio of hybrids in three groups was greatly different between trails.Generally,hybrids which were plus superior to two parents had a little larger percentage in height than in another two traits,whereas hybrids which were negative superior to two parents had a little larger percentage in DBH and volume than in height;the degree of hybrid hetersis was between-37.5%～14.3% in height,-39.4%～17.2% in DBH,-58.6%～74.1% in volume which was the largest.The ratio of hybrids in different degree of hetersis showed nomal distribution in all three growth traits,8.8% and 5.9% hybrids which were 10% greater than two parents,open-pollinated sibs were found in height and in DBH,and 5.9% hybrdis were 30%～60% greater than two parents,open-pollinated sibs,2.9% hybrdis were above 60% greater than two parents,open-pollinated sibs.It is feasible to breed hybrids with greater hetersis through artificial breeding program.Hybrids with greater hetersis were easily obtained between two provenance with greater geographical segregation or between foreign provenance and Guangdong provenance.更多还原