Emergent plant presence and richness alter competitive interactions between two foating plants  

挺水植物的存在和丰富度改变了两种浮萍间的竞争关系

作　　者：Jun-Nan Liu Fang-Ru Wu Sergio R.Roiloa Wei Xue Ning-Fei Lei Fei-Hai Yu 

机构地区：[1]College of Ecology and Environment,Chengdu University of Technology,Chengdu 610059,China [2]Institute of Wetland Ecology&Clone Ecology/Zhejiang Provincial Key Laboratory of Evolutionary Ecology and Conservation/College of Life Science,Taizhou University,Taizhou 318000,China [3]Department of Biology,BioCost Group,Faculty of Science,Universidade da Coruña,15071 A Coruña,Spain

出　　处：《Journal of Plant Ecology》2024年第2期89-99,共11页植物生态学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(32071527)。

摘　　要：Interactions between two plant species can be infuenced by the presence of other plant species and such an effect may change as the diversity of the other species increases.To test these hypotheses,we frst constructed aquatic communities consisting of 1,2 and 4 emergent plant species and then grew ramets of Lemna minor only,ramets of Spirodela polyrhiza only or ramets of both L.minor and S.polyrhiza within these aquatic communities.We also included controls with ramets of L.minor,S.polyrhiza or both but without any emergent plants.Biomass and number of ramets of L.minor and S.polyrhiza were signifcantly smaller with than without the emergent plants,but they did not differ among the three richness levels.The presence of S.polyrhiza did not signifcantly affect the growth of L.minor,and such an effect was not dependent on the richness of the emergent plant species.Without the emergent plant species,the presence of L.minor markedly reduced biomass(-92%)and number of ramets(-88%)of S.polyrhiza.However,such a competitive effect of L.minor on S.polyrhiza became much weaker in the presence of one emergent plant species(-46%biomass and-39%number of ramets)and completely disappeared in the presence of two or four emergent plant species.Therefore,both the presence and richness of emergent plant species can alter competitive interactions between the two duckweed species.These fndings highlight the importance of species diversity in regulating plant-plant interactions.两种植物之间的相互作用会受到其他植物存在的影响,这种影响可能会随其他植物物种多样性的增加而改变。为验证这些假说,我们首先构建了由1、2和4种挺水植物组成的水生群落,然后在这些水生群落中分别单种了青萍(Lemna minor)、单种了紫萍(Spirodela polyrhiza)以及混种了青萍和紫萍。我们还设置了含有青萍、紫萍或青萍+紫萍但不含任何挺水植物的对照处理。青萍和紫萍的生物量和分株数在挺水植物存在时显著少于无挺水植物时,但在3个多样性水平之间并无显著差异。紫萍的存在对青萍的生长无显著影响,并且这种效应与挺水植物的物种丰富度无关。当挺水植物不存在时,青萍的存在会大幅减少紫萍的生物量(-92%)和分株数(-88%),但这种青萍对紫萍的竞争效应在存在一种挺水植物时会大幅减弱(生物量-46%和分株数-39%),而在存在两种或4种挺水植物时完全消失。因此,挺水植物的存在及其物种丰富度会改变两种浮萍之间的竞争关系。上述发现强调了物种多样性在调节植物间相互作用中的重要性。

关 键 词：clonal plant competitive interactions foating plant plant-plant interactions emergent plant 

分 类 号：Q948[生物学—植物学]