生态学报2017，Vol.37Issue(19)：6544-6551,8.DOI:10.5846/stxb201607031366
不同邻居物种的基因型多样性对冷蒿生长的影响
Effects of genotypic diversity of neighboring species on the growth of Artemisia frigida plants
摘要
Abstract
Anthropogenic activities are dramatically altering patterns of biodiversity around the globe,triggering extensive research on the consequences of changes in biodiversity of ecosystem and community processes.Multiple investigations on the ecological effects of both plant genetics and species diversity have shown,for example,that more diverse systems are generally more productive,and support more abundant and more diverse animal communities.In recent years,some research have shown showed that the outcome of plant-plant interactions varies with the diversity of dominant neighbor genotypes.Plant diversity,either genotypic or species diversity,could mediate plant-plant interactions in communities via at least two mechanisms.First,increased relative competition intensity between neighboring plants and target species typically leads to higher productivity of neighboring plants.Alternatively,increased trait variation of neighboring plants rather than increased competition in different communities may explain the change in plant-plant interactions.In the present study,we hypothesized that genotypic diversity of the neighboring plants may affect the growth of the target species by changing the coefficient of trait variation of the community.In this study,we conducted a factorial microcosm experiment with three combinations of genotypes (1,3,6 genotypes =G1,G3,G6) of two neighboring plants (Leymus chinensis and Koeleria cristata),and one genotype of the target species,Artemisia frigida.Furthermore,we investigated the growth performance (aboveground biomass,belowground biomass,total biomass,and plant height) and relative competition intensity (RCI) of A.frigida when surrounded by different levels of genetic diversity for L.chinensis or K.cristata.We analyzed six traits (aboveground biomass,belowground biomass,total biomass,plant height,root length,and specific leaf area [SLA]) of L.chinensis or K.cristata at different levels of genotypic diversity using principal component analysis (PCA).In addition,the correlations between the four traits of A.frigida and six traits of L.chinensis or K.cristata were calculated by means of Kendall rank correlation coefficient analysis.The results revealed the following:(1) The performance of A.frigida was dependent on neighboring plants.Higherg genotypic diversity of L.chinensis significantly decreased aboveground biomass,total biomass and plant height of A.frigida,and A.frigida grew the least when the genotype number of L.chinensis was six.For G6 of L.chinensis,the RCI of aboveground,belowground and total A.frigida was significantly greater than that for the G1 treatment (P＜0.05).However,for K.cristata,genotypic diversity did not exhibit significant effects on the performance or RCI of A.frigida.(2) The trait variation of neighboring plants was also dependent on the species and their genotypic diversity.When the neighboring plant was L.chinensis,genotypic diversity significantly affected trait variation,and trait variation increased with an increasing number of genotypes,whereas no significant differences were detected when the neighboring plant was K.cristata.(3) The results of the Kendall correlation coefficient analysis revealed significant negative correlations between total biomass and SLA of L.chinensis and aboveground biomass and total biomass of A.frigida.These results provided experimental data on the effects of genotypic diversity of neighboring plants on the target species,and we outlined how more traits or relative competition intensity mediating plant-plant interactions could be identified.Future studies may use population genetic survey of genotype distribution in fields and methods from trait-based ecology to better quantify the impact of intraspecific genetic variation on plant-plant interactions,so as to facilitate and enhance ecological restoration in the typical steppe of northern China in the context of global change.关键词
邻居植物/目标植物/植物间相互作用/基因型多样性/竞争/性状Key words
neighboring plant/target plant/plant-plant interactions/genotypic diversity/competition/traits引用本文复制引用
刘磊,辛晓静,王宇坤,曲耀冰,杨雪,李隔萍,赵念席,高玉葆..不同邻居物种的基因型多样性对冷蒿生长的影响[J].生态学报,2017,37(19):6544-6551,8.基金项目
国家自然科学基金项目(31570427) （31570427）
