天山云杉球果性状变异及其与地理因子关联性OA北大核心CSTPCD

Picea schrenkiana var.tianschanica is an endemic tree species distributed in the mountainous are-as of central Asia.In China,it is only found in the Tianshan Mountains of Xinjiang,and has important eco-logical and scientific research values.In this study,four P.schrenkiana var.tianschanica populations dis-tributed along the central and eastern Tianshan Mountains and western Tianshan Mountains were used as materials,and descriptive statistics,nest ANOVA,multiple comparisons,and cluster analysis were adopted to investigate the differences of cones and seed scale traits between and within the populations,and to ana-lyze the geographical variations of cones and seed scale traits of P.schrenkiana var.tianschanica with alti-tude gradient.Pearson correlation analysis was used to explore the correlation between traits and geograph-ical and climatic factors,and to reveal the geographical variation law.The results showed that there were significant differences between populations(P＜0.01)in the 7 traits of cones with abundant variations,and the largest coefficient of variation was found in the dry cone mass,the highest variation in the popula-tion,and the smallest coefficient of variation in the cone width.The stem quality of cones,cone length,cone width,seed scale length and seed scale width gradually decreased with the increase of altitude,while the length to width ratio of cones and seed scale did not change significantly with the altitude gradient.There existed significant correlation between cone traits,and altitude and precipitation affected cone size.Cluster analysis divided the four natural populations into three categories:the first category was the central popula-tion of the Tianshan Mountains and the populations of the central and western parts of the mountains;the second category was the population of the central and eastern parts of the mountains;the third category was the western population of the mountains.The phenotypic variation of the traits of P.schrenkiana var.tianschanica cones is abundant,and there are certain changes in each trait with the altitude gradient.