Abstract: Arbuscular mycorrhizal fungi (AMF) and rhizobium are two important groups of soil microorganisms that form a symbiotic system with plants,helping the plant take up nutrients and water,and promoting plant growth. Depending on the host plants and nutrient conditions,the mediation on plant growth by AMF and rhizobium is different. In this study,the effects of inoculation with AMF and rhizobium (single inoculation and double inoculation) on plant growth were quantified by Meta-analysis,and the effects of host differences and nutrient addition on the symbiotic relationship were further analyzed. The results showed that co-inoculation with AMF and rhizobium broke the potential resource limitation and showed a significant synergistic effect compared to a single inoculation;host differences would affect the synergistic effect,which was manifested as a positive effect value of the total biomass of legumes greater than that of non-legumes,but the positive effect value of nitrogen and phosphorus content was smaller than that of non-legumes;by changing the “investment-reward”,nutrient addition would break the synergistic effect,and reduce legumes biomass and root colonization. Therefore,taking account of host differences and soil nutrient content is an important prerequisite for the use of mycorrhizal agents.

Key words: Arbuscular mycorrhizal fungi, Rhizobium, Synergism effect, Nitrogen and phosphorus addition, Legumes, Non-legumes

摘要： 丛枝菌根真菌(Arbuscular mycorrhizal fungi，AMF)和根瘤菌(Rhizobium)是两类重要的土壤微生物，可与植物形成共生体系，帮助植物吸收养分和水分，从而促进植物生长。宿主植物和养分条件不同，AMF和根瘤菌介导的植物生长状况不尽相同。本研究通过Meta分析定量研究了接种AMF和根瘤菌(单接种与双接种)对植物生长的影响，并进一步分析了宿主差异和养分添加对共生关系的影响。结果表明，共同接种AMF和根瘤菌打破了潜在资源限制，相较单一接种表现出显著的协同效应；宿主差异会影响协同效应，表现为豆科植物总生物量的正效应值大于非豆科植物，但氮磷含量的正效应值小于非豆科植物；养分添加通过改变“投资-收益”关系，打破了协同效应，降低豆科植物总生物量和侵染率。因此，充分考虑宿主差异和土壤养分含量是发挥菌剂的重要前提。

关键词: 丛枝菌根真菌, 根瘤菌, 协同效应, 氮磷添加, 豆科, 非豆科