落羽杉优良种源选择

对16个不同落羽杉(Taxodium distichum(L.)Rich)种源的树高、胸径、单株材积、冠幅、枝下高、分枝角度、分枝数等进行了研究,结果表明:(1)不同种源间树高、胸径、单株材积、冠幅、枝下高等性状差异达到显著水平,但不同种源间的分枝角度和分枝数差异不显著,其中9号和6号种源的树高、胸径、单株材积最高,16号种源的树高、胸径和单株材积最小;(2)性状的相关分析表明,落羽杉的树高、胸径、单株材积、枝下高、冠幅之间均呈显著相关关系,但这些指标与分枝角度和分枝数等因子之间相关关系不显著;(3)各性状的广义遗传力以胸径最高,分枝角度和分枝数量最低;(4)多性状综合评定结果得出9号、6号、12号、13号和4号种源的综合评价值较低,为优良的种源,这些优良种源可作为我国相类似地区作用材、防护和园林观赏树种扩大推广应用。

A Primary Study on Selection of Superior Provenance of Taxodium distichum (L.) Rich

The tree height,DBH,individual volume,crown,height of the lowest branch,branching angle and number of shoot of 16 bald cypress(Taxodium distichum(L.)Rich) provenances were determined.The results were as follows:(1) There existed a significant variation of 16 provenances in tree height,DBH,individual volume,crown,height of the lowest branch,but the variations of the branching angle and number of shoot were not significant.The 9th and 6th provenance had highest height,DBH and volume,while the tree height,DBH and volume among 16th provenances was lowest.(2) The correlative analysis showed that there were significant positive relativity among the tree height,DBH,individual volume,crown and height of the lowest branch,but there was not obvious relativity between these indexes and branching angle and number of shoot.(3) The analysis results of heritability showed that the heritability of DBH of bald cypress was highest,and the heritability of the branching angle and number of shoot was lowest.(4)The 9th,6th,12th,13th and 4th superior provenances were selected from the 16 provenances by using synthetical selection of multiple characters,and these five provenances had higher production after being cultivated.