Effects of arbuscular mycorrhizal (am) fungi on elaeagnus mollis diels seedling growth under different fertility level

In order to discuss the relationship between mycorrhizal infection rate and rhizosphere nutritional status, this paper studied the indexes (like seedling morphology, biomass, mycorrhizal infection rate, etc.) of Elaeagnus mollis Diels with inoculating or without inoculating AM fungi under different fertilizers and different fertility statuses. Results showed: AM fungi could increase absorption utilization of seedling on slightly soluble P fertilizer, calcium superphosphate (Ca(H₂PO₄)₂·H₂O) (content of effective ingredient (P₂O₅) is 0.04 g/kg soil), and soluble P fertilizer, dipotassium phosphate (K₂HPO₄) (content of effective ingredient (P₂O₅) is 0.02 g/kg soil), which both had good promotion effect on seedling growth. With the increasing of soluble P concentration, however, AM fungi would inhibit the accumulation of seedling biomass. AM fungi also could promote the absorption of seedling on nitrate N fertilizer, potassium nitrate (KNO₃) (content of effective ingredient (NO₃^-) is 0.06 g/kg soil), and ammonia N fertilizer, ammonium sulfate ((NH₄)₂SO₄) (content of effective ingredient (NH₄⁺) is 0.06 g/kg soil), which both were good to seedling growth. Therefore, it is concluded that rhizosphere nutritional status is one of important factors to mycorrhizal infection rate.