23年生落羽杉优良家系及优良单株配合选择

Combination Selection of Excellent Families and Plus Tress of Taxodium distichum

通过对江汉平原23年生落羽杉15个家系子代测定林的胸径、树高和材积进行调查和分析,结果表明:不同家系间的胸径、树高和材积差异极显著,胸径、树高和材积性状家系遗传力均在44%以上,各性状受到中等强度的遗传控制,其中胸径家系遗传力最大为53.53%;利用育种值评分法和性状表现水平分析法从15个参试家系中选出5个优良家系,用2种方法选出的家系完全一致,胸径、树高和材积平均遗传增益分别为2.04%、0.88%和4.29%,平均现实增益分别为3.81%、2.00%和8.54%,并在优良及家系的基础上再选出优良单株13株,其平均胸径、树高和材积分别为32.35 cm、20.38 m和0.8061 m^3。所选出的优良家系和优良单株生长优势明显,可作为优良遗传材料进行保存和利用。

Progeny test was conducted on diameter at breast height(DBH),tree height,stem volume of 15 families of 23 years old Taxodium distichum in Jianghan Plain.The result showed there were significant differences among families on DHB,tree height and stem volume.The family heritability of DHB,tree height and volume were above 44%and DHB was up to 53.53%,the growth characters were mainly controlled by genetic factors.5 excellent families were selected according to grading of breeding value and performance level of phenotypic traits,the two methods selected five identical families,their average genetic gains were 2.04%,0.88%and 4.29%,and the real gains were 3.81%,2.0%and 8.54%.The average tree height,DHB and volume of 13 excellent plus trees were 32.35 cm,20.38 m and 0.8061 m^3.The selected eccellent families and plus trees had obvious growth advantage and should be preserved as excellent genetic materials.