Effects of Mixed Plantation of Pinus massoniana with Different Broadleaf Species on Soil Microbial Community Composition and Diversity
This study explored the effects of different mixing patterns on the community composition and di-versity of soil bacteria and fungi in the Mixed Pinus massoniana/Castano p sis hystrix plantation(MPC),Mixed P.massoniana/Erythrophleum fordii plantation(MPE),and Mixed P.massoniana/(C.hystrix,E.fordii,Mytilaria laosensis,Michelia macclurei,and Manglietia glauca)plantation(MPM),with the P.massoniana Pure plantation(PP)as the control.The results were yielded as follows.(1)The mixed planta-tions all increased Fine Root Biomass(FRB)and Total Litterfall mass(TL),which were the highest in MPM(P＜0.05).(2)MPC,MPE,and MPM increased the fungal diversity index Chao1(P＜0.05),whereas they did not cause significant changes in the bacterial Chao1 compared with PP.(3)Proteobacteria,Acidobacteria,and Chloroflexi were the main dominant bacterial phyla,and Ascomycota,Basidiomycota,and Zygomycota were the dominant fungal phyla.Compared with PP,MPC increased the relative abundance of Bacteroidetes and Zygomycota(P＜0.05),and MPE increased the relative abundance of Bacteroidetes and Armatimonade-tes while decreasing the relative abundance of Proteobacteria(P＜0.05).(4)Soil Available Phosphorus(AP),Carbon to Nitrogen ratio of fine root(Croot∶Nroot)and Carbon to Phosphorus ratio of fine root(Croot∶Proot)were significantly correlated with the bacterial community diversity indices,while Soil Organic Carbon(SOC)and pH value were the most critical factors influencing bacterial community composition.Total Nitro-gen(TN)and Bulk Density(BD)were significantly correlated with the fungal community diversity indices,and Soil Water Content(SWC)was the main factor influencing the fungal community composition.In conclu-sion,the mixed plantation of P.massoniana with a single or multiple broadleaf species for 5 years significant-ly affects the soil fungal diversity,while it does not have significant effect on the bacterial diversity.
south subtropicalPinus massoniana plantationtree species mixingsoil microbial diversitymi-crobial community composition
万方数据
维普
