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分别以受喜旱莲子草(Alternanthera philoxeroides)入侵和未受喜旱莲子草入侵的当地植物群落土壤为生长基质,比较不同基质上入侵植物喜旱莲子草和同属的土著植物莲子草(A.sessilis)的生长指标,探讨喜旱莲子草入侵群落土壤对喜旱莲子草及莲子草生长的影响机制。结果表明,喜旱莲子草入侵群落土壤抑制了莲子草的生长,显著降低了根生物量、茎生物量和总生物;改变了形态特征,显著降低了分枝数量、茎长度、根长、根体积;减少了对根的生物量分配,显著抑制了根质量比与根冠比。喜旱莲子草入侵群落土壤对入侵植物喜旱莲子草的生物量、分枝数量、茎长度、根长、根体积没有显著的抑制作用,而显著增加了其叶片数量和叶质量比。这种效应将有利于喜旱莲子草在入侵地形成单优群落,表明土壤在喜旱莲子草成功入侵中起了重要作用。
The soil of native plant community, invaded by Alternanthera philoxeroides and not invaded by Alternanthera philoxeroides, was used as the substrate for growth. Alternanthera philoxeroides (Invasilianus) and invasive plants of A. sessilis ) To investigate the mechanism of the influence of Alternanthera philoxeroides community on the growth of Alternanthera philoxeroides and lotus grass. The results showed that A. alternatus invasion of soil inhibited the growth of lotus seedlings, significantly reduced the root biomass, stem biomass and total organisms; changed morphological characteristics, significantly reduced the number of branches, stem length, root length, root Volume; reduce the biomass allocation to the root, significantly inhibited the root mass ratio and root to shoot ratio. The invaded community soil had no significant inhibitory effect on the biomass, branch number, stem length, root length and root volume of the invasive plant, Alternanthera philoxeroides, but significantly increased its leaf number and leaf mass ratio. This effect will help the Alternanthera philoxeroides to form a single superior community in invaded land, indicating that the soil plays an important role in the successful invasion of Alternanthera philoxeroides.