Abstract
Background and aims
Given the broad distribution of bryophytes and their prominence in alpine and high latitude ecosystems, to generate a better understanding of how bryophyte communities influence soil CO2 efflux is essential for increasing our comprehension of the global C cycle.
Methods
We measured CO2 efflux from bryophyte-covered and bryophyte-removed soil surface in two subalpine ecosystems: a conifer dominated forest and an ericaceous dominated shrubland, on the east edge of Tibetan Plateau. In addition, soil temperature (T soil), soil water content (SWC), total soil organic C (SOC), dissolved organic C (DOC) and microbial community structure were measured as possible drivers of the bryophyte-effects.
Results
Bryophyte removal resulted in reduced floor (bryophyte + soil) and mineral soil CO2 efflux, SOC, DOC, microbial biomass C (MBC) and phospholipid fatty acid (PLFA) concentrations, and caused a change in soil microbial community in the two ecosystems. The higher soil CO2 emissions from the bryophyte-covered, relative to the bare soil, was not caused by the changes in T soil and SWC, rather, it was consistent with the higher SOC, DOC, MBC and/or the PLFAs contents in the plots with bryophytes.
Conclusion
Our results highlight bryophytes are regulators of soil C efflux in subalpine ecosystems. Incorporating the effects of bryophytes will help improve the accuracy of current ecosystem C cycling models.
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Abbreviations
- C:
-
carbon
- CO2 :
-
carbon dioxide
- T soil :
-
soil temperature
- SWC:
-
soil water content
- SOC:
-
total soil organic carbon
- DOC:
-
dissolved organic carbon
- MBC:
-
microbial biomass carbon
- PLFA:
-
phospholipid fatty acid
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Acknowledgements
The authors appreciate the support of the Alpine Ecosystem Observation and Experiment Station of Mt. Gongga and the Yanting Agro-ecological Experimental Station of Purple Soil, institute of mountain hazards and environment, CAS. This work was supported by the National Natural Science Foundation of China (grant numbers. 41473078, 41273096); the Key Laboratory of Mountain Surface Processes and Ecological Regulation, CAS.
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Sun, SQ., Liu, T., Wu, YH. et al. Ground bryophytes regulate net soil carbon efflux: evidence from two subalpine ecosystems on the east edge of the Tibet Plateau. Plant Soil 417, 363–375 (2017). https://doi.org/10.1007/s11104-017-3264-3
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DOI: https://doi.org/10.1007/s11104-017-3264-3