CAJ | 학술논문

通过对10个杨树无性系的8个树冠性状进行测定,筛选出叶面积指数(LAI)、冠形率(CSR)、树冠表面积(CSA)、一级分枝粗度(D_(fb))、枝下高(H_(ub))和冠幅(W)等6个与材积有关的性状,分析了各树冠性状间的相关性和杨树无性系间树冠性状的遗传差异及其差异来源.结果表明:各树冠性状间存在显著相关.LAI只与CSA呈显著正相关;CSA、D_(fb)、W三者相互间呈极显著正相关;H_(ub)与W呈极显著正相关;而CSR与CSA、D_(fb)、H_(ub)、和W显著负相关.10个无性系的6个树冠性状均有明显不同,但只有D_(fb)和H_(ub)两性状差异显著.10个无性系的各树冠性状的遗传力都较低,均小于0.5,各树冠性状受环境因素的影响较大.可见,杨树无性系树冠性状的差异主要来源于环境因素,可通过水肥管理、修枝、间伐、整地等人为栽培管理措施来改善环境条件,优化杨树树冠结构,提高杨树树势,从而抑制病原菌的生长和传播.因此基于树冠结构的杨树寄主主导性病害的生态调控是实际可行的.
통과대10개양수무성계적8개수관성상진행측정,사선출협면적지수(LAI)、관형솔(CSR)、수관표면적(CSA)、일급분지조도(D_(fb))、지하고(H_(ub))화관폭(W)등6개여재적유관적성상,분석료각수관성상간적상관성화양수무성계간수관성상적유전차이급기차이래원.결과표명:각수관성상간존재현저상관.LAI지여CSA정현저정상관;CSA、D_(fb)、W삼자상호간정겁현저정상관;H_(ub)여W정겁현저정상관;이CSR여CSA、D_(fb)、H_(ub)、화W현저부상관.10개무성계적6개수관성상균유명현불동,단지유D_(fb)화H_(ub)량성상차이현저.10개무성계적각수관성상적유전력도교저,균소우0.5,각수관성상수배경인소적영향교대.가견,양수무성계수관성상적차이주요래원우배경인소,가통과수비관리、수지、간벌、정지등인위재배관리조시래개선배경조건,우화양수수관결구,제고양수수세,종이억제병원균적생장화전파.인차기우수관결구적양수기주주도성병해적생태조공시실제가행적.
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.