Distribution Characteristics and Influencing Factors of AM Fungi in Rhizosphere of Four Common Plants in Typical Evergreen and Deciduous Broad-leaved Mixed Forest in Lushan Mountain
[Objective]The aims were to explore the distribution characteristics and influencing factors of Arbuscular Mycorrhizal fungi(AM fungi)in the rhizosphere of four common plants in typical evergreen and deciduous broad-leaved mixed forests in Lushan Mountain,and to fill the shortage of underground ecological research on common plants in evergreen and deciduous broad-leaved mixed forests.[Method]Four common plants(Lindera glauca,Corylopsis sinensis,Rhododendron simsii and Lindera reflexa)in the typical evergreen and deciduous broad-leaved mixed forest in the north of Lushan Mountain were studied.The concept of dominant community was introduced and combined with the morphological identification method of AM fungal spores to explore.[Results]Firstly,four common plants were infected,but there was no significant difference in infection rate among different plants.Secondly,32,28,28 and 22 AM fungal species were isolated from the rhizosphere of L.glauca,C.sinensis,R.simsii and L.reflexa,respectively.At the same time,there were dominant AM fungi in the rhizosphere of the four plants,and the common species were the most.Thirdly,there were no significant differences in spore density,Shannon-Wiener index,species richness(except for the C.sinensis)and evenness index of AM fungal communities in different plant rhizosphere,but there were significant differences in spore density and species richness of AM fungal communities with different dominance,except for the spore density of widely distributed species,the spore density of common species and the species richness of common species.Fourthly,total potassium was significantly correlated with spore density of dominant species.Soil organic matter was significantly correlated with Pielou evenness index,spore density of dominant species and species richness of rare species.pH was significantly correlated with species richness of widespread species,and nitrate nitrogen was significantly correlated with species richness,species richness of widespread species and spore density of rare species.Fifthly,redundancy analysis found that soil organic matter and total potassium were the main soil factors explaining the variation.[Conclusion]In summary,the typical evergreen deciduous broad-leaved mixed forest in Lushan has abundant resources of AM fungi in the rhizosphere soil of common plants.The common species and widespread species of AM fungi were evenly distributed,while the rare species and dominant species of AM fungi were unevenly distributed.At the same time,AM fungi in the rhizosphere soil of common plants were affected by soil factors except for common AM fungi.Therefore,common plants in typical evergreen and deciduous broad-leaved mixed forests in Lushan have certain specific selection for AM fungi,but the selection is affected by soil factors.
Lushan evergreen deciduous broad-leaved mixed forestDominant community of AM fungiCommon plantRhizosphere soilMorphological identification method
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