Abstract: [Objective] To explore the effects of microbial fertilizers on the soil physicochemical properties and vegetation community characteristics of degraded grasslands with different soil types. [Methods] Three typical degraded soil types （sandy loam, sandy soil, and chestnut soil） in the Hulunbuir Grassland were selected as research objects. Three microbial fertilizer treatments （T1: Soil Remediation Microbial Agent+Root and Leaf Protection Agent produced by Shandong Zhongnong Fuyuan; T2: Soil Remediation Microbial Agent+Chelated Water-Soluble Fertilizer produced by Wodifeng Biofertilizer; T3: Soil Remediation Microbial Agent+Hugen 120 produced by Lihaoyuan Biology） and a control group （CK） were established. A two-year field experiment was conducted to analyze their effects on soil physicochemical properties and vegetation community characteristics. [Results] ①In terms of vegetation community characteristics: compared to the control group, the T3 treatment significantly increased the vegetation coverage in sandy loam and sandy soil by 48.5% and 40.5%, respectively （P<0.05）, and increased hay yield by 59.0% and 74.11%; for the chestnut soil, the T2 treatment exhibited the best effect, significantly increasing coverage and yield by 9.7% and 49.9% compared to CK （P<0.05）. ②In terms of soil physicochemical properties: the pH value showed a decreasing trend in all treatment groups, among which T2 treatment had the most significant improvement effect on sandy loam and sandy soil, while T1 treatment showed the most notable improvement effect on chestnut soil; meanwhile, the T3 treatment increased the organic matter content in sandy loam by 2.03 times, and the T2 treatment increased the available potassium content in sandy soil to 116.07 mg/kg （5.3 times higher than CK）. [Conclusion] The effects of microbial fertilizers on the soil physicochemical properties and vegetation community characteristics of degraded grasslands vary significantly across different soil types. Fertilizers containing trace elements such as silicon and calcium （e.g., T3） show more significant improvement effects on sandy grasslands, while fulvic acid-type microbial fertilizers （e.g., T1, T2） are more suitable for application in chestnut soil （slightly saline-alkaline） grasslands. The results provide a reference for the precise ecological restoration of degraded grasslands with different soil types.

Key words: microbial fertilizers, degraded grasslands, sandy loam, sandy soil, chestnut soil, vegetation restoration