摘要
多数恶性入侵植物都是克隆植物,阐明克隆特性对入侵性的影响有利于深入揭示其入侵机制。以国内代表性的入侵植物喜旱莲子草(Alternanthera philoxeroides)为研究对象,研究克隆整合(匍匐茎连接)对喜旱莲子草克隆片段入侵不同密度的本地黄花水龙(Ludwigia peploides)种群时的资源分配,生长、生理和竞争力的影响,探讨克隆整合及其介导的劳动分工对该植物入侵性的贡献。结果表明:竞争显著降低了喜旱莲子草端部分株和整个克隆片段的生长和克隆繁殖(分株数和总匍匐茎长);克隆整合则显著促进了竞争环境下喜旱莲子草端部分株的生长表现和竞争能力,且在高密度竞争环境下更为明显;克隆整合显著增加了高密度竞争下整个克隆片段的生物量积累。此外,竞争环境下喜旱莲子草克隆片段表现出明显的劳动分工现象,表现为基部分株专化吸收地下资源而端部分株专化地上部分扩繁。喜旱莲子草的克隆整合特性能有利于其入侵本地植物种群。
Many exotic plant invader are clonal,and it is of great significance to understand the contribution of the clonal traits on their invasiveness.To reveal the contribution of the clonal integration and the division of labor on the invasiveness of this plant invader,we investigated the effects of the clonal integration(stolon connection)on the resource allocation,growth,physiology and competitive ability of the invasive Alternanthera philoxeroides clonal fragments under the competition by the different density of the native Ludwigia peploides plant populations.The results showed that native plant competition significantly reduced the final biomass,ramet number and the total stolon length of both the apical ramets and the whole fragments.Clonal integration greatly improved the growth performance and the competitive ability of the apical ramet of A.philoxeroides when suffering the competition by the native plant population,especially under high density competition.Clonal integration also greatly increased the final biomass of the whole fragment under high density competition.Moreover,the stolon connection allowed the division of labor within the clonal fragment under the competitive environment,with the basal ramets specializing in acquisition of belowground resources and the apical ramets specializing in acquisition of aboveground expansion.Therefore,It is concluded that the clonal integration can facilitate the invasion of A. philoxeroides into native plant populations.
作者
吕晓倩
韩翠敏
奚道国
游文华
LYU Xiao-qian;HAN Cui-min;XI Dao-guo;YOU Wen-hua(College of Architecture&Art,Hefei University of Technology,Hefei 230009,China;College of the Environment&Safety Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2019年第6期1093-1102,共10页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家自然科学基金项目（31770394）
水体污染控制与治理科技重大专项（2015ZX07503-005-007）
中央高校基本科研业务费专项资金（JZ2018HGBZ0110）~~
关键词
克隆劳动分工
喜旱莲子草
黄花水龙
耗益分析
竞争能力
clonal division of labor
Alternanthera philoxeroides
Ludwigia peploides
cost-benefit analysis
competitive ability
