关键词: 丛枝菌根真菌, 菌剂多样性, 玉米产量, 磷累积量, 钾累积量

Abstract:

【Objective】The aim of this study was to clarify the effects of different arbuscular mycorrhizae fungi (AMF) inoculants and their diversity on maize grains yield and the absorption and accumulation of phosphorus (P) and potassium (K) in acidic soil, so as to provide a theoretical basis for the application of farmland microbial fertilizer and the improvement of crop nutrient uptake. 【Method】Four different AMF species (Funneliformis mosseae, A; Glomus tortuosum, B; Glomus versiforme, C; Funneliformis geosporum, D) were selected as experimental materials in 2019 and 2020, and a pot experiment with sixteen treatments was established during maize growth periods, including CK (non-inoculating AMF species), inoculating single AMF treatment, two AMF mixed treatments, three AMF mixed treatments, and four AMF mixed treatments. The maize grain yield, plant biomass and their P and K accumulation were analyzed. 【Result】Compared with CK, the presence of each type of AMF species could increase maize grain yield and their P and K accumulation. Compared with CK, the presence of A, B, C and D increased maize grain yield by 57.9%, 26.9%, 40.5% and 32.9%, respectively, increased the maize grain P accumulation by 77.8%, 48.2%, 26.2% and 75.8%, respectively and increased maize grain K accumulation by 85.5%, 62.1%, 59.0% and 63.5%, respectively. With AMF inoculant diversities increasing, the average values of maize grain yield showed an increasing tendency, with four AMF mixed treatments>three AMF mixed treatments>two AMF mixed treatments>single AMF treatments, and the average grain yield of four AMF mixed treatments was 12.3% higher than that of the single AMF treatments. The tendency of grain P accumulation among the AMF diversity treatments was two AMF mixed treatments>four AMF mixed treatments>three AMF mixed treatments>single AMF treatments, and the average grain P accumulation for two AMF mixed treatments was 23.2% higher than that of single AMF treatments. However, there was no significant difference of grain K accumulation among AMF diversity treatments. 【Conclusion】In acidic soil, the inoculation of different AMF species could significantly increase maize grain yield and their P and K accumulation, and the effects of Funneliformis mosseae was best on improving maize grain yield and their P and K accumulation among four AMF species. The increase of AMF inoculant diversities could significantly improve maize grain yield and their P accumulation, while the four mixed AMF showed a better effect on grain yield, and on grain nutrient uptake for two mixed AMF. All of these indicated that, according to the purposes of high grain yield or high grain quality in production, the suitable types of AMF species should be selected to inoculate their host, and the mix of different types of AMF species should matched reasonably.

Key words: arbuscular mycorrhizal fungi, inoculant diversity, maize yield, phosphorus accumulation, potassium accumulation