外来入侵植物大狼把草种群构件生物量结构研究

Module biomass structure traits of the alien invasive Bidens frondosa population

关键词:  外来入侵植物  生物量结构  入侵性  大狼把草

Key words:  alien invasive plant  biomass structure  invasiveness  Bidens frondosa

摘要:

大狼把草是广泛分布于我国的外来入侵植物之一,通过样方调查,从构件水平定量分析了大狼把草种群各构件的结构特征及其生物量间的关系模型,并探讨了其与入侵性的关系。结果表明:大狼把草种群各构件生物量之间的关系为茎>花序>根>叶。各构件生物量所占比率表现为茎>花序>叶>根。大狼把草种群各构件生物量之间及各构件生物量与植株高度之间都呈显著正相关关系,均可用幂函数模型较好地表达。大狼把草种群各构件较强的表型可塑性及其在生殖器官中较高的生物量投资分配特性,极大地提高了其入侵能力。

Abstract:

Bidens frondosa is one of the most widely distributed alien invasive plants in China. Biomass structure characteristic and correlation models among different modules of B.frondosa population were studied at module level by sampling surveys. The quantitative analysis and the relation between the characteristics and its invasiveness were also done in this paper. The results showed that the module biomass of B.frondosa decreased in the sequence of stem,capitulum,root,leaf,and the biomass proportion of each module to the whole plant biomass decreased in the sequence of stem,capitulum,leaf,and root. The biomass of each module had significant positive correlations with plant height,it also had significant positive correlation with that of the others,and all the correlations could be well expressed by exponential model. Stronger phenotypic plasticity of each B.frondosa module and higher biomass allocation greatly enhanced its invasive ability.