Effects of AMF inoculation on maize and soybean interspecific competition of N uptake on red soil under intercropping condition
Three mycorrhizal treatments [uninoculation (NM),Funneliformis mosseae (FM) inoculation,Funneliformis etunicatum (FE) inoculation] and three cropping ways (intercropping,nylon net separation and monocropping) were set up for exploring the effects of arbuscular mycorrhizal fungi (AMF) and different cropping ways on plant interspecific competition of N uptake on red soil.Results showed that the roots of maize and soybean both were infected by FM and FE fungi,and the colonization percentage ranged from 37％ to 56％.The plant height,root length and biomass of maize were obviously higher than those of soybean.Under treatment of AMF inoculation or uninoculation,the biomass of maize increased in the order of intercropping＜nylon net separation＜monocropping,and that of soybean monocropping＜nylon net separation＜intercropping,showing that intercropping promoted maize growth,but inhibited soybean growth.No matter what kinds of cropping ways,AMF inoculation improved nitrogen (N) uptake of maize and soybean in different degrees,decreased the available N content in soil planted with maize and soybean.Under treatment of AMF inoculation or uninoculation,intercropping promoted obviously the N uptake of maize,and also promoted the N uptake of monocropping soybean.In all the treatments,the competitive strength and N competitive ratio of maize were better than those of soybean.In any case of AMF treatment,the relative competitive strength of maize against soybean under intercropping condition was better than that under nylon net separation condition.Using any way of cropping,the N competitive ratio of maize to soybean under AMF inoculation treatment is better than that under uninoculation treatment.In conclusion,maize was always in competitive advantage position,while soybean was always in disadvantage.Inoculation of FM and FE significantly promoted the growth of maize and soybean,and significantly improved the relative competition of maize against soybean.Under FM inoculation and intercropping treatment the absorption of available N of maize and soybean was higher,and the relative competitive strength and N competitive ratio of maize to soybean were the highest.These revealed that AMF could affect the competitiveness between the host plant species,and this influence was most obvious under the complex condition of AMF and intercropping planting.
NETL
NSTL
万方数据
维普
