Effects of different amounts of active lignite and mycorrhizal fungi on soil properties and growth of elymus nutans in Yimin mining area

The soil of dumping site in Inner Mongolia Yimin mining area is poor structure and lack of nutrients, therefore improving the soil structure and fertility is primary solution to the ecological reconstruction of this area.This paper used pot experiments to explore the impact of different addition amount of active lignite combined with mycorrhizal fungus on soil properties including available nutrients and microorganisms and the growth of elymus dahuricus, in order to provide scientific basis for the active lignite with mycorrhizal fungus used land reclamation and ecological restoration in Yimin mine area.The results show that with the increase in usage amount of active lignite, the soil of available nutrients, organic matter, cation exchange capacity, and quantity of microorganisms are on the increase.The amount of active lignite with mycorrhizal fungus fertilizer not more than 4 500 kg/hm², can promote the growth of elymus root colonization, and the amount not more than 7 500 kg/hm² improves the root colonization of Arbuscular richness; at the same time with the increase of the amount of active lignite fertilizer, the aboveground and underground biomass of elymus increased when active lignite amount is not more than 7 500 kg/hm².Therefore, in practical application, the proposed dosage of active lignite is 4 500-7 500 kg/hm² to improve the soil quality of mine area.