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. 2022 Apr 21;13:833968. doi: 10.3389/fmicb.2022.833968

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Copyright © 2022 Wang, Liu, Jiang, Ji and Li.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Changes of enzyme activity, electrical conduction and organic matter content m rhizosphere soils from fields with continuous cropping of alfalfa for 1, 7, and 14 years. (A) Catalase and S-NP activity. (B) Sucrase activity and electrical conduction. (C) Urease activity. (D) Polyphenol oxidase activity. Error bars indicate standard errors of the means of three repetitions. Different letters above the bars indicate significant difference according to Duncan’s multiple range test (P = 0.05).