Correlation and Genetic Difference of Crown Traits of Poplar Clones
By measuring eight crown traits of ten poplar clone, six of them,including leaf area index (LAI),crown shape ratio (CSR), surface area of crown (CSA), first-order branch diameter (D_(fb)),height under branch (H_(ub)) and crown width (W), which correlated significantly with tree volume, were screened out. And correlation among crown traits and genetic difference among these polar clones were analysized. The results showed that there was a significant positive correlation between LAI and CSA; CSA, D_(fb) and W were very significantly positively correlated with each other; H_(ub) was very significantly positively correlated with W. But CSR was significantly negatively correlated with CSA, D_(fb), H_(ub) and W. Besides, all these crown traits of ten poplar clones were different, but significiantly different only in two crown traits; D_(fb) and H_(ub). All these crown traits exhibited low heritability, less than 0.5. From above,the main source of crown trait difference among clones were environmental factors. Thus, breeding poplar clones haiving better crown traits and forest manage measures, such as, improvement of management of water and fertilizer, pruning and thinning, can be taken to improve environment,to optimize crown structure, to improve tree vigor of poplar, and finally to go against transmission and growth of pathogen. So ecological control to polar host leading diseases based on crown structure is feasible.
国家科技期刊平台
NSTL
万方数据
维普
