杭州湾湿地围垦区42种草本植物化感潜力和优势度关系的研究

The Relationship between Allelopathic Potential and Dominance of 42 Herbs in the Reclaimed Area of Hangzhou Bay Wetlands

采用野外样地调查研究物种优势度和室内分析测试物种化感潜力的方法,研究了杭州湾湿地围垦区优势草本植物群落42个物种的化感潜力、优势度以及两者的关系.结果表明,物种之间和功能群之间化感潜力表现出显著的差异,金色狗尾草、空心莲子草、黄花草木樨等植物化感潜力较强,而白茅、糙叶苔草和束尾草等植物化感潜力较弱.不同功能型物种的化感潜力和在群落中的优势度表现出相反的变化趋势,非禾本科植物和禾本科植物相比较、一二年生植物与多年生植物相比较,以及非克隆植物和克隆植物相比较,前者都表现出较强的化感潜力而优势度较低.总体来看,物种的化感潜力和其优势度呈显著的负相关关系.以上结果说明,杭州湾湿地围垦区优势草本植物群落结构可能主要由植物的生活史、克隆等功能性状而非化感潜力决定,这些性状可能和化感潜力之间存在权衡关系.

The allelopathic potential,dominance and their relations of 42 herb species in the reclaimed area of Hangzhou bay wetlands were studied by field sample survey and indoor analysis.The results showed that main variation in allelopathic potential existed among the species and functional groups.Among these species,Setaria glauca,Alternanthera philoxeroides and Melilotus officinalis displayed stronger allelopathic potential,while Imperata cylindrica,Carex scabrifolia and Phacelurus latifolius showed weaker allelopathic potential.The allelopathic potential and dominance in communities of different functional species showed opposite trends,that was,other families>Gramineous plants,annuals/biennials>perennial species,non-clonal species>clonal species,the former ones had stronger allelopathic potential but lower important value.Overall,the allelopathic potential of the species was negatively related to the dominance.It indicated that the dominant herbaceous community structure in the reclaimed area of Hangzhou bay wetlands may be mainly determined by plant life history,cloning and other functional traits rather than allelopathic potential.There may be a trade-off relationship between these traits and allelopathic potential.