Method for utilizing earthworm fungicide for improving soil nitrogen nutrients to achieve growth promotion of fast growing forest

The invention discloses a method for utilizing earthworm fungicide for improving soil nitrogen nutrients to achieve growth promotion of fast growing forest, and belongs to the technical field of forestry ecology. The method has the advantages that the effect is good, wherein the content of total nitrogen and effective nitrogen in soil is remarkably increased within one year; the content of nitrogen is greatly improved, wherein accumulation of total nitrogen and effective nitrogen in soil has the remarkable synergistic interaction effect; multiple purposes are achieved at the same time, wherein due to application of pig manure, biogas slurry combined with earthworms and fungicide, the content of effective nitrogen in soil can be rapidly increased, the nitrogen fertility stability can be rapidly improved, growth of fast growing forest can be promoted, the branch diameter, the plant height and the crown breadth are improved by 1.7 times, 1.3 times and 5.1 times compared with CK, and livestock excrement pollution is digested and saved. A research shows that due to application of earthworms and fungicide, the decomposition rate of pig manure in soil can be increased, so that the soil nitrogen content is increased; some nitrogen in air which cannot be utilized by plants can be converted into available nitrogen elements; earthworms and fungicide contain carbon and nitrogen nutrients, and due to the combined application, the content of nitrogen in soil can be increased.