Fast seedling root growth leads to competitive superiority of invasive plants
Fast seedling root growth leads to competitive superiority of invasive plants
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幼苗根部快速生长导致入侵植物的竞争优势
DOI：
10.1007/s10530-018-1664-9
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发表时间：
2018-07-01
影响因子：
2.9
通讯作者：
Fang, Suqin
中科院分区：
文献类型：
--
作者：
Ni, Ming;Liu, Yu;Fang, Suqin
入侵植物的竞争优势在植物入侵过程中起着关键作用，使入侵植物能够克服当地植物群落的抗性。地面上的快速生长和高密度导致入侵物种在争夺光的竞争中具有竞争优势。然而，人们对地下根系竞争在入侵中可能发挥的作用知之甚少。研究了入侵灌木决明子（cassia alata）、归化非入侵灌木corchorus capsularis和本土灌木网纹石斛（desmodium reticulatum）根系生长对其生长性能的影响。我们比较了三种植物的幼苗生长情况和它们在原地的竞争能力。theC的词根。阿拉木图幼苗的生长速度比c的快得多。capsularisandD。在整个生长期，虽然有网状结构；alatahad较短的芽和。reticulatum。此外,C。与其他两种相比，阿拉木图表现出明显的竞争优势，种内竞争的生物量减少较少，种间竞争的竞争效应较高。我们的研究表明，快速的幼苗根系生长可能是解释入侵植物竞争优势的重要原因。未来的研究应进一步关注入侵植物的地下特征、茎根生长的权衡、根系竞争对入侵植物种群动态和入侵群落结构的影响。
The competitive superiority of invasive plants plays a key role in the process of plant invasions, enabling invasive plants to overcome the resistance of local plant communities. Fast aboveground growth and high densities lead to the competitive superiority of invasive species in the competition for light. However, little is understood of the role belowground root competition may play in invasion. We conducted an experiment to test the effect of root growth on the performance of an invasive shrubCassia alata, a naturalized, non-invasive shrubCorchorus capsularis, and a native shrubDesmodium reticulatum. We compared seedling growth of the three species and their competitive ability in situ. The roots of theC. alataseedlings grew much faster than those ofC. capsularisandD. reticulatumduring the entire growth period althoughC. alatahad shorter shoots thanD. reticulatum. Furthermore,C. alatashowed an apparent competition advantage compared to the other two species as evidenced by less biomass reduction in intraspecific competition and higher competitive effects in interspecific competition. Our study reveals that fast seedling root growth may be important in explaining the competitive advantages of invasive plants. Future studies should pay more attention to the belowground traits of invasive plants, the trade-off between shoot and root growth, and the role of root competition in affecting the population dynamics of invasive plants and the structures of invaded communities.