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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Changes in microbial biomass carbon content and soluble organic carbon content in different times and treatments. The error bars represent the standard deviation (SD). The significant differences between treatments are indicated by different lowercase letters labeled (p < 0.05, n = 3).