江汉平原湖区落羽杉优良家系早期选择

目的]初选一批落羽杉优良家系。方法]对江汉平原三台林场6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]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59%以上,各性状受到中等至较强度的遗传控制,其中胸径家系遗传力高达79.82%;利用育种值评分法从15个参试家系中初步选出了6个优良家系,平均遗传增益分别为6.9%、4.6%和11.3%,平均现实增益分别为8.7%、6.9%和16.3%,其中③号家系胸径、树高和材积均有最高的遗传增益和现实增益。结论]所选出的优良家系生长优势明显,可作为优良遗传材料进行保存,同时也可为落羽杉优良家系的长期选择奠定基础。

Excellent Family Early Selection of Taxodium distichum in Jianghan Plain Lake District

Objective]Excellent family of Taxodium distichum were preliminary selected.Method]Progeny test forest was conducted on diameter at breast height(DBH),tree height,stem volume of 15 families of 6 years old Taxodium distichum in Santai Forest Farm in Jianghan Plain.Result]There were significant differences among families on DHB,tree height and stem volume.The family heritability of DHB,tree height and volume were above 59% and DHB was up to 79.82%,the growth characters were mainly controlled by genetic factors.6 excellent families were selected according to grading of breeding value,their average genetic gains were 6.9%,4.6% and 11.3%,and the real gains were 8.7%,6.9% and 16.3%,the third family had highest genetic and real gains on DHB,tree height and volume.Conclusion]The selected families had obvious growth advantage and should be preserved as excellent genetic materials,they also could lay a foundation for long tern selection of excellent family of Taxodium distichum.