4.8 Article

Responses of the functional structure of soil microbial community to livestock grazing in the Tibetan alpine grassland

期刊

GLOBAL CHANGE BIOLOGY
卷 19, 期 2, 页码 637-648

出版社

WILEY
DOI: 10.1111/gcb.12065

关键词

climate change; gene diversity; microbial community; summer grazing; Tibetan alpine grassland

资金

  1. National Science Foundation of China [41171201]
  2. State Key Joint Laboratory of Environment Simulation and Pollution Control [11Z03ESPCT]
  3. National Basic Research Program [2010CB833502]
  4. United States Department of Energy, Biological Systems Research on the Role of Microbial Communities in C Cycling Program [DE-SC0004601]
  5. Oklahoma Bioenergy Center (OBC)
  6. ENIGMA-Ecosystems
  7. Networks Integrated
  8. Genes and Molecular Assemblies through the Office of Science, Office of Biological and Environmental Research, of the U.S. Department of Energy [DE-AC02-05CH11231]
  9. United States Department of Agriculture through NSF-USDA Microbial Observatories Program [2007-35319-18305]

向作者/读者索取更多资源

Microbes play key roles in various biogeochemical processes, including carbon (C) and nitrogen (N) cycling. However, changes of microbial community at the functional gene level by livestock grazing, which is a global land-use activity, remain unclear. Here we use a functional gene array, GeoChip 4.0, to examine the effects of free livestock grazing on the microbial community at an experimental site of Tibet, a region known to be very sensitive to anthropogenic perturbation and global warming. Our results showed that grazing changed microbial community functional structure, in addition to aboveground vegetation and soil geochemical properties. Further statistical tests showed that microbial community functional structures were closely correlated with environmental variables, and variations in microbial community functional structures were mainly controlled by aboveground vegetation, soil C/N ratio, and NH4+-N. In-depth examination of N cycling genes showed that abundances of N mineralization and nitrification genes were increased at grazed sites, but denitrification and N-reduction genes were decreased, suggesting that functional potentials of relevant bioprocesses were changed. Meanwhile, abundances of genes involved in methane cycling, C fixation, and degradation were decreased, which might be caused by vegetation removal and hence decrease in litter accumulation at grazed sites. In contrast, abundances of virulence, stress, and antibiotics resistance genes were increased because of the presence of livestock. In conclusion, these results indicated that soil microbial community functional structure was very sensitive to the impact of livestock grazing and revealed microbial functional potentials in regulating soil N and C cycling, supporting the necessity to include microbial components in evaluating the consequence of land-use and/or climate changes.

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