关键词: 微生物菌肥, 施用方法, 施用量, 土壤养分, 生物量, 草原露天矿

Abstract: Taking open coal mine dump at typical steppe as research objective, this paper studied the effects of different microbial fertilizer application methods (spreading over, furrow dressing) and different application amount (0.12 mL/m2, 0.24 mL/m2, 0.36 mL/m2) on soil nutrient and grass growth. The results indicated that applying microbial fertilizer could increase soil organic matter content, which was significantly higher than that of the contrast field (P<0.05). The soil organic matter content was increased by 1.54 times in A2B3 treatment (furrow dressing + 0.36 mL/m2). After applying microbial fertilizer, the average aboveground biomass of Medicago sativa and Elymus dahuricus were 53.84 g/m and 50.76 g/m, respectively, which were higher than those without fertilization (Medicago sativa 39.40 g/m, Elymus dahuricus 40.04 g/m, respectively). The average aboveground biomass of Medicago sativa and Elymus dahuricus under in furrow dressing methed were all higher than that of the spreading over method. The aboveground biomass of Medicago sativa and Elymus dahuricus reached the highest in the treatment A2B3 (furrow dressing + 0.36 mL/m2) and the dry matter accumulation was also high. Applying microbial fertilizer could increase soil fertility and accelerat vegetation construction, thus play an important role in the process of ecological restoration at open coal mine dump of steppe.

Key words: microbial fertilizer, application method, application amount, soil fertility, biomass, open coal mine dump at steppe