丛枝菌根真菌对秸秆腐解及小麦生长的影响OA

The influence of arbuscular mycorrhizal fungi(AMF)on straw decomposition and subsequent crop growth in rice fields was investigated,offering theoretical insights into AMF-mediated nutrient cycling and crop nutrient use efficiency in paddy soils.Using rice straw as the material and wheat as the host plant,four treatments were set up:no nitrogen fertilizer and straw addition(N0CK),straw addition only(CK),AMF inoculation and straw addition(FM),and no straw addition(NSCK).A pot experiment was conducted to study the effects of inoculating AM fungi on the decomposition rate of rice straw,the accumulation of wheat biomass and nitrogen utilization.Results showed that at the wheat maturity stage,the dry matter weight of both vegetative organs and spikes followed the order FM>NSCK>CK>N0CK.Under the FM treatment,the dry matter weight of vegetative organs and spikes increased significantly by 25.8%and 29.2%,respectively,compared to CK.In terms of nitrogen accumulation,the spike nitrogen accumulation in NSCK was the highest at both flowering and maturity stages.At maturity,the total plant nitrogen accumulation in the FM treatment was 21.38%higher than in CK.Compared with CK,the FM treatment significantly enhanced the dry matter decomposition rate,carbon decomposition rate,and nitrogen decomposition rate of rice straw by 6.4%,13.4%,and 12.3%,respectively.Furthermore,the FM treatment significantly increased after-anthesis nitrogen accumulation and contribution of after-anthesis nitrogen translocation to grain compared to both CK and NSCK.Regarding nitrogen use efficiency,both FM and NSCK treatments exhibited significantly higher values than CK in terms of nitrogen agronomic efficiency(NAE),nitrogen recovery efficiency(NRE),and partial factor productivity of applied nitrogen(NPFP)of nitrogen fertilizer.Specifically,under the FM treatment,NAE,NRE,and NPFP of nitrogen fertilizer increased by 21.8%,30.5%,and 21.8%,respectively,compared to CK.The straw return treatment alone reduced wheat dry matter accumulation and nitrogen use efficiency.Inoculation with AMF promoted the decomposition of previous crop straw,enhanced the release of carbon and nitrogen nutrients,and improved wheat nutrient uptake and translocation,thereby increasing nitrogen fertilizer efficiency and mitigating the negative effects of straw return alone.Therefore,under straw return conditions,the combined application of AMF inoculants should be considered.