红锥叶片功能性状对地理环境因子的响应

Leaf is an important nutrient organ for physiological and biochemical activities of plants, and itsfunctional traits reflect the environmental adaptability of plants to a certain extent. Revealing the relationshipbetween the functional traits of leaves of Castanopsis hystrix and geographic environmental factors can help tounderstand its adaptive response to environmental changes and provide a theoretical basis for the conservation ofC. hystrix germplasm resources and the selection and utilization of high-quality seed sources. In this study, sixpopulations of C. hystrix in Guangxi were used as the research object. Various statistical methods including nestedanalysis of variance, principal component analysis, and cluster analysis were employed to analyze the variation ofleaf functional traits and their correlation with geographic environmental factors and explore the pattern ofgeographical and environmental variation in the leaf functional traits of C. hystrix. The results were as follows: (1)The 13 leaf functional traits of C. hystrix showed highly significant differences among and within populations (P< 0.001), with high diversity. (2) The leaf functional traits were dominated by intra-population variation (averagetrait differentiation coefficient, Vst = 22.28%), and the differentiation between populations of morphological traits(15.88%-46.71%) was higher than that of physiological and biochemical traits (7.19%-35.46%), indicating thatthe morphological traits of leaves responded more significantly to the environment. (3) The leaf functional traits were positively correlated with altitude, latitude and longitude, but negatively correlated with annual precipitation,indicating that the leaf functional traits of C. hystrix were affected by altitude, geographical distance andprecipitation. (4) Cluster analysis divided the participating C. hystrix populations into two groups, and Mantel testshowed that leaf functional traits were significqantly positively correlated with both geographical distance (P =0.028) and altitude (P = 0.013), and the effect of altitude on leaf functional traits was relatively more significant.In summary, the functional traits of C. hystrix leaves were rich in variation, which mainly originated from withinpopulationsand showed a pattern of geographic variation dominated by changes in altitude, latitude, longitude andprecipitation.