Abstract: To maintain and improve soil quality is a crucial issue in agriculture and forestry. In this paper, a composite preparation of marine Bacillus subtilis 3728, marine B. subtilis 3512, marine Trichoderma TF4, and white clover (Trrifolium repens) was developed, and applied to the soil in a one-year-old Eucalyptus plantation to examine its improvement effects on soil quality. The results showed that this preparation played a regulation role on the soil microbial populations and communities. The individuals of Aspergillius, Trichoderma, Mucor, and other cellulose-decomposing fungi in the soil increased, while those of Fusarium decreased, compared with the control. In the meanwhile, the total number of soil bacteria increased 10 fold, among which, Bacillus subtilis and B. cereus increased 202 and 118 folds, respectively, and the total number of soil actinomyces increased 03 folds. This preparation increased the contents of soil organic matter, ammonia nitrogen, and available phosphorous, and stimulated the activities of soil sucrase, protease, and urease significantly. After applied the preparation into soil for 180 days, the average tree height of Eucalyptus was 126% greater than that of the control, suggesting the promotion effects of the preparation on Eucalyptu growth.

Key words: Glyphosate, Brachionus calyciflorus, Life history characteristics