Abstract
Background and aims
Microbial communities and their associated enzyme activities affect the quantity and chemical quality of carbon in soil. We aimed to evaluate the biochemical mechanisms underlying how N2-fixing species influences soil organic carbon chemical composition through soil microbial functional groups and enzyme activities.
Methods
We examined the effects of N2-fixing species mixed with Eucalyptus on soil carbon storage, and the chemical composition of an 8-year-old pure Eucalyptus urophylla plantation (PP) and a mixed E.urophylla and Acacia mangium plantation (MP).
Results
The soil carbon stock and recalcitrant carbon chemical component significantly increased in surface soil in MP. The total PLFAs and bacterial PLFAs increased by 29.1% and 27.0% in cool-dry season, while in the warm-wet season, the total PLFAs and bacterial PLFAs increased by 13.1% and 27.3%, respectively. However, the fungal PLFAs decreased significantly in warm-wet season in MP. The total activity of the cellulose-degrading enzyme β-glucosidase was significantly greater with mixed N2-fixing species in both dry-cool and wet-warm season. The increase in the Alk-C/O-Alk-C ratio and SOC was strongly associated with both C-acquisition activity and bacterial community.
Conclusions
Our findings highlight the importance of N2-fixing species in regulating both soil microbial communities and their functioning in association with soil extracellular enzyme activities, which contribute to the increased soil carbon storage and recalcitrant carbon composition in Eucalyptus plantations.
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Acknowledgments
We gratefully acknowledge the supports from Yi Wang, JiaXu, and Yuan Wen, for their assistance in field sampling and data collection. We also gratefully acknowledge the supports by the Experimental Center of Tropical Forestry, Chinese Academy of Forestry. This study was jointly supported by the National Natural Science Foundation of China (31290223, 31470627, and 31560201), the Ministry of Science and Technology (2015DFA31440), the Lecture and Study Program for Outstanding Scholars from Home and Abroad (CAFYBB2011007), the Ministry of Finance (201404201), and Guangxi Natural Science Foundation under Grant No. 2014GXNSFBA118100. We were also supported by the CFERN & GENE Award Funds on Ecological Paper. We are grateful to Dr. Junwei Luan and Dr. Zongda Hu for their assistance in statistical analyses and useful discussions on the manuscripts.
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Huang, X., Liu, S., You, Y. et al. Microbial community and associated enzymes activity influence soil carbon chemical composition in Eucalyptus urophylla plantation with mixing N2-fixing species in subtropical China. Plant Soil 414, 199–212 (2017). https://doi.org/10.1007/s11104-016-3117-5
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DOI: https://doi.org/10.1007/s11104-016-3117-5