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在毛白杨气候区划的基础上,选取不同气候区有代表性的54株老树,通过无性繁殖,在同一地点上进行试验,对其生长性状进行了毛白杨无性系变异规律的研究.分析结果表明,不同气候区的毛白杨无性系,在生长量、生长节律、形态、物候、叶色素含量和抗叶锈病等特征上存在着显著差异,而且无性系生长变异与地理气候因子关系密切.应用多变量分析对无性系性状进行的综合分析表明.在毛白杨分布区内,可将毛白杨群体划分为三种生态型,即南部生态型、东北部生态型和西北部生态型.毛白杨分布区可分为中心分布区、一般分布区和边远分布区.其中南部气候区是中心分布区,从该区选择优良无性系可能将会获得双重的增益.
Based on the climate division of Populus tomentosa, 54 representative old trees in different climatic zones were selected and tested on the same place through asexual reproduction, and their growth traits were studied on the clonal variation of Populus tomentosa. The results showed that Populus tomentosa clones in different climatic zones had significant differences in the characteristics of growth, growth rhythm, morphology, phenology, leaf pigment content and leaf rust resistance, and clonal growth variation was closely related to geographical climatic factors. Multivariate analysis of clonal traits conducted a comprehensive analysis shows that Populus tomentosa population, Populus tomentosa population can be divided into three types of ecotypes, namely, the southern ecotype, the northeastern ecotype and the northwestern ecotype. Populus tomentosa distribution The area can be divided into central distribution area, general distribution area and remote distribution area, of which the southern climate area is the central distribution area, and selecting fine clones from this area may gain double gain.