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

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