【Objective】In order to provide the basis for determining the trees' reasonable fertilization and preventing soil fertility decline,a study of inoculated probiotics of Eucalyptus grandis × E. urophylla artificial forest about felling of biomass and nutrient returned had been carried out.【Method】Azotobacter N1,releasing potassium bacteria 40 K,phosphate-solubilizing bacteria P1 strains were inoculated to No.9 Eucalyptus grandis × Eucalyptus urophylla. After afforestation,amount of increment in logging residue...