Figure 4
Temporal variations of soil microbial carbon (SMBC, a), soil microbial nitrogen (SMBN, b), SMBC/SMBN (c), soil urease (d), soil invertase (e), soil cellulose (f), soil acid phosphatase (g), soil neutral phosphatase (h), soil alkaline phosphatase (i) and soil dehydrogenase (j). Error bars represent standard error (n = 3). CK: Normal fertilization with no γ-PGA application, γ-PGA: Normal fertilization with application of 350.44 mg γ-PGA kg−1 soil. **p < 0.01, *p < 0.05.
