Abstract: In order to reveal the mechanism of arbuscular mycorrhizal fungi and plant symbiosis in restoring sandy degraded land in the northern farming-pastoral ecotone,this study selected three common grass species:Medicago satuva L.,Bromus inermis Leyss and Festuca arundinacea Schreb as test materials in the degraded land, and the inoculation with Glomus etunicatum (GE),Glomus mosseae (GM),Glomus intradicular Glomus (GI) to those species and non-inoculated (CK) treatments were set up. The infection rate of endoroot balloon (GI) to Medicago satuva,Bromus inermis and Festuca arundinacea was the highest,followed by balloon Moses (GM),and the infection rate of balloon (GE) was the lowest. The biomass of alfalfa and fescue inoculated with GM and GI was significantly higher than that of inoculated with GE. Correlation analysis also showed that AMF infection rate was positively correlated with plant height,biomass and the number of tillers (or branches). In conclusion,the plant height,biomass and the number of tillers (or branches) of the three grassland plants were promoted by AMF inoculation. The combination of GI inoculation to Bromus inermis is suitable for the degraded land in the farming-pastoral ecotone,which provides a method of efficient vegetation restoration of the degraded land by microorganisms.

Key words: Vegetation restoration, Arbuscular mycorrhizal fungi, Degraded grassland, Alfalfa, Bromus inermis Leyss

摘要： 为筛选出适用于农牧交错带沙荒地的植物和丛枝菌根真菌(Arbuscular mycorrhizal fungi，AMF)的优势组合，本研究选取沙荒地常见的3种植物，紫花苜蓿(Medicago satuva L.)、无芒雀麦(Bromus inermis Leyss)和苇状羊茅(Festuca arundinacea Schreb.)作为试验材料，设置接种幼套球囊霉(Glomus etunicatum，GE)、摩西球囊霉(Glomus mosseae，GM)、根内球囊霉(Glomusntraradices，GI)和不接种(CK)处理。结果表明：根内球囊霉(GI)接种紫花苜蓿、无芒雀麦和苇状羊茅接种的侵染率最高，其次是摩西球囊霉(GM)，幼套球囊霉(GE)。相关分析也表明，AMF侵染率与植物株高、生物量和分蘖(枝)数呈极显著正相关。综上，接种AMF能显著提高3种草地植物的株高、生物量和分蘖(枝)数，促进植物的生长。GI接种无芒雀麦的组合适用于农牧交错带荒滩地，为探索利用微生物高效快速的进行沙荒地植被恢复提供技术参考。

关键词: 植被恢复, 丛枝菌根真菌, 退化草地, 紫花苜蓿, 无芒雀麦