广西科学院学报2025，Vol.41Issue(2)：191-203,13.DOI:10.13657/j.cnki.gxkxyxb.20250722.005
喀斯特季节性雨林树种气孔性状分异格局及其驱动机制
Divergence Patterns and Driving Mechanisms of Stomatal Traits in Tree Species from Karst Seasonal Rainforests
摘要
Abstract
The purpose of this study is to clarify the differentiation pattern of stomatal traits of dominant tree species in karst seasonal rain forest in Guangxi on different habitat gradients,reveal the common driving mechanism of environmental adaptability and phylogenetic history,and provide theoretical basis for ecological restoration of rocky desertification.In this study,3 300 leaves of 33 dominant tree species in the rainforest were selected as the research objects,and their stomatal traits were measured.The evolutionary conservation of the traits was evaluated by phylogenetic signal analysis,and multiple regression analysis was carried out in combination with environmental factors to analyze the differentiation pattern and driving factors of stomatal traits.The results showed that there were significant differences in stomatal traits trade-off strategies among plants in depression,middle slope and peak habitats.The stomatal length of depression plants was larger[(10.73±2.93)μm],and the density was lower[(327.82±163.50)stomata/mm2].The stomatal density of plants on the peak was higher[(521.33±269.80)stomata/mm2],and the stomatal opening was the largest(0.46±0.18).The stomatal characteristics of middle slope plants were between the two.Phylogenetic signal analysis showed that the ratio of stomatal area to stomatal perimeter area had significant phylogenetic conser-vation(P＜0.05).There was no significant phylogenetic signal for dynamic traits such as stomatal opening.The results of Redundancy Analysis(RDA)showed that the bareness degree of rock,soil total carbon and soil total nitrogen were the key factors driving plant stomatal differentiation.The topographic drought index affects the water use strategy of plants by affecting the trade-off between stomatal area and density.The a-bove results indicate that karst plants achieve evolutionary differentiation through multi-dimensional adapta-tion strategies,and phylogenetic conservation and environmental screening jointly shape the evolutionary mechanism of stomatal traits.This study provides a theoretical basis for species screening and community construction for ecological restoration in rocky desertification areas.关键词
季节性雨林/气孔性状权衡/系统发育保守性/环境筛选/喀斯特峰丛洼地Key words
seasonal rainforest/stomatal traits trade-offs/phylogenetic conservatism/environmental filtering/karst peak-cluster depression分类
农业科技引用本文复制引用
王登惠,王静,董燕平,韦宇静,农正权,龙继凤,王斌,李冬兴..喀斯特季节性雨林树种气孔性状分异格局及其驱动机制[J].广西科学院学报,2025,41(2):191-203,13.基金项目
国家自然科学基金项目(32260276,32271599),弄岗喀斯特生态系统广西野外科学观测研究站科研能力建设项目(桂科23-026-273)和广西植物研究所基本业务费项目(桂植业23014)资助. （32260276,32271599）
