Abstract
Purpose
Soil microbes control the bioelement cycles and energy transformation in forest ecosystems, and are sensitive to environmental change. As yet, the effects of altitude and season on soil microbes remain unknown. A 560 m vertical transitional zone was selected along an altitude gradient from 3023, 3298 and 3582 m, to determine the potential effects of seasonal freeze-thaw on soil microbial community.
Materials and methods
Soil samples were collected from the three elevations in the growing season (GS), onset of freezing period (FP), deeply frozen period (FPD), thawing period (TP), and later thawing period (TPL), respectively. Real-time qPCR and polymerase chain reaction denaturing gradient gel electrophoresis (PCR-DGGE) were used to measure the abundance and structure of soil microbial community.
Results and discussion
The bacterial, archaeal, and fungal ribosomal DNA (rDNA) copy numbers decreased from GS to freezing stage (FP and FPD) and then increased in thawing stage (TP and TPL). Similarly, the diversity of microbial community varied with seasonal freeze-thaw processes. The diversity index (H) of the bacterial and archaeal communities decreased from GS to FP and then increased to TPL. The fungal community H index increased in the freezing process.
Conclusions
Our results suggested that abundance and structure of soil microbial community in the Tibetan coniferous forests varied by season and bacterial and archaeal communities respond more promptly to seasonal freeze-thaw processes relative to fungal community. This may have important implications for carbon and nutrient cycles in alpine forest ecosystems. Accordingly, future warming-induced changes in seasonal freeze-thaw patterns would affect soil nutrient cycles via altering soil microbial properties.
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Acknowledgements
We are very grateful to the nice suggestions from the reviewers. This project was financially supported by National Natural Science Foundation of China (Nos. 31570445, 31270498, 31570601, 31500509), and Ph.D. Programs Foundation of Ministry of Education of China (20105103110002).
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Responsible editor: Peter William Clinton
Li Zhang and Ao Wang contributed equally to this work.
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Zhang, L., Wang, A., Yang, W. et al. Soil microbial abundance and community structure vary with altitude and season in the coniferous forests, China. J Soils Sediments 17, 2318–2328 (2017). https://doi.org/10.1007/s11368-016-1593-0
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DOI: https://doi.org/10.1007/s11368-016-1593-0