桂西南喀斯特区域不同稳定性群落下飞机草种群结构特征分析

目的]揭示不同稳定性群落下飞机草种群年龄结构动态变化规律,以深入了解飞机草对不同群落稳定性条件的适应性表现,为飞机草的防治提供理论依据.方法]采用主成分分析法和灰色关联度分析法,研究群落的稳定性特征;通过分析飞机草种群年龄结构、存活曲线和时间序列预测,探讨不同稳定性群落下飞机草种群结构及动态变化规律.结果]飞机草在不同稳定性群落下其种群年龄结构不同,稳定性较强群落的飞机草种群结构发展为衰退型,种群存活曲线接近于Deevev Ⅰ型;稳定性为中等和差的群落的飞机草种群多处于增长阶段,种群存活曲线属于DeeveyⅢ型或接近DeeveyⅡ型曲线.结论]高本土植物覆盖度和丰富度、少人为干扰、强稳定性的群落能有效抑制飞机草的入侵.

Structure analysis of Eupatorium odoratum population in communities with different stability in Karst region of southwest Guangxi

【Objective】The purpose of this research was to reveal the age structure dynamics of Eupatorium odoratum population and further understand Eupatorium odoratum adaptability to the communities with different stability， so as to provide theoretical information for Eupatorium odoratum control. 【Method】Principal components analysis and grey relational analysis were used to study the stability characteristics of communities. Population structure and dynamic change rule of Eupatorium odoratum were discussed based on age structure， survival curve， and time series prediction of Eupatorium odoratum populations. 【Result】The results showed that age structure of Eupatorium odoratum population varied among the communities with different stability, in high stability communities， Eupatorium odoratum population was declining and the population survival curve was close to DeeveyⅠ， while in low and middle stability communities， Eupatorium odoratum population was increasing and population survival curve was Deevey Ⅲ or close to DeeveyⅡ. 【Conclusion】The community with high coverage and abundance of native plants, less human intervention and strong stability， could effectively control the invasion of Eupatorium odoratum.