摘要:很多入侵植物具有克隆性，克隆整合对入侵克隆植物生长和繁殖具有重要的贡献。自然界中，植物生长和繁殖所需的各种资源如光照、水分和矿质养分等在空间上分布通常是异质的，但关于异质环境下克隆整合对入侵植物和本土同属植物种间关系影响的研究相对缺乏。通过温室控制实验，将入侵植物南美蟛蜞菊（Wedelia trilobata）和同属本土植物蟛蜞菊（W.chinensis）的分株对单独种植或者混合种植在异质性光照条件下，同时通过保持或者切断分株之间的连接来控制克隆整合效应的有无，研究异质光照环境下克隆整合对南美蟛蜞菊和蟛蜞菊种间关系的影响。克隆整合对南美蟛蜞菊和蟛蜞菊的生长和繁殖都有促进作用，且南美蟛蜞菊比蟛蜞菊从克隆整合中获益更多。与单独种植相比，两者混种对南美蟛蜞菊的叶生物量有显著影响，而对本地种蟛蜞菊的根生物量有显著影响。克隆整合和种间关系对南美蟛蜞菊的总生物量和叶生物量产生了显著的交互作用，而对蟛蜞菊各指标无显著影响。克隆整合状态显著影响了南美蟛蜞菊和蟛蜞菊的种间关系。这些结果表明，异质环境下克隆整合可以改变入侵植物南美蟛蜞菊和本土植物蟛蜞菊的生长性状及种间关系。



Abstract:Many invasive plants can reproduce clonally, and clonal integration plays an important role in the growth and reproduction of invasive clonal plants. In nature, the spatial distribution of resources for plant growth and reproduction, including light, water, and mineral nutrients, is usually heterogeneous. However, limited information is available regarding the effects of clonal integration on interspecific interactions between invasive plants and their native congeners in heterogeneous environments. A controlled greenhouse experiment was conducted with the invasive plant Wedelia trilobata and its congeneric native plant W. chinensis to explore effects of clonal integration on interspecific interactions between them in heterogeneous light environments. Ramet pairs of W. trilobata and W. chinensis were grown singly or in mixture under heterogeneous light conditions, and the connections between the two ramets of the pair were maintained or severed to allow for or prevent clonal integration. Clonal integration promoted growth and reproduction in W. trilobata and W. chinensis, and W. trilobata benefited more from clonal integration than W. chinensis. Compared to planting of each species singly, planting of the two species in mixture had significant effects on leaf biomass of W. trilobata and root biomass of W. chinensis. There was a significant interaction effect of clonal integration and interspecific interactions on total biomass and leaf biomass of W. trilobata, but not on the growth traits of W. chinensis. Clonal integration had significant effects on the interspecific interactions between W. trilobata and W. chinensis. These results indicate that clonal integration can alter some growth traits and interspecific interactions between the invasive plant W. trilobata and the native plant W. chinensis in heterogeneous environments.





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