观赏树种法桐的多样性调查与优树选择研究

目的]从聊城市区的行道树法桐中进行优树选择,选育出综合性状优良的法桐树体。方法]以法桐为调查对象,利用样地调查法,采用统一调查标准和优树选择标准选择良好树体。对高度、围径、冠幅进行方差分析,分析各性状的变异系数,采用候选优树按小样地法选择。结果]高度、围径、冠幅的F值分别为1.43、2.16和1.98,没有一个大于F0.05值(2.99);除高度外,其他性状的变异系数都有5个区组在0.20以上,而且总体变异系数在0.33以上;每个地点的候选优树,按小样地法选择,都超过了60%,在86.1%~98.2%,按五株大树法选择,都超过了标准30%以上,在31.4%~57.8%。结论]所选地段无明显差异,在此进行多样性调查和选择是可行的。整个调查的法桐各性状都存在广泛的变异。根据分数标准进行综合评定结果,选出了2株法桐综合性状优良的优树。该研究为今后法桐育种奠定了良好基础。

Study on Diversity Investigation and Superior-tree Selection of Ornamental Tiee Species Platanus orientalis

Objective] The research aimed to select superior trees from in street tree Platanus orientalis in the urban district of Liaocheng city and select P.orientalis trees with excellent synthesis traits.Method] With P.orientalis as the investigation objects,based on the investigation of sample plot,good trees were selected by using the unified investigation standard and superior-tree selection standard.Height,circumference and crown width were dealt with by variance analysis,the variation coefficients of each traits were analyzed and the candidate superior trees were selected by using the method of small sample plot.Result] F values of height,circumference and crown width were 1.43,2.16 and 1.98 respectively,none of them was bigger than F0.05 value(2.99).CV values of all traits except height in 5 blocks were more than 0.20 and CV value was over 0.33 on the whole.The rates of candidate superior trees selected by the method of small sample plot in each spot all exceeded 60%,being 86.1%～98.2% and that selected by the method of 5 big trees all exceeded 30%,being 31.4%～57.8%.Conclusion] The selected sites had no obvious difference.Based on this,it was feasible to make diversity investigation and selection.All the traits of P.orientalis had wide variations in the whole investigation process.According to the fraction standard,the results were comprehensively evaluated to select 2 superior trees of P.orientalis with good comprehensive traits.This research laid good foundation for the breeding of P.orientalis in future.