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Landscape Ecology

, Volume 30, Issue 9, pp 1669–1682 | Cite as

Patterns and drivers of soil microbial communities along a precipitation gradient on the Mongolian Plateau

  • Dima Chen
  • Jia Mi
  • Pengfei Chu
  • Junhui Cheng
  • Lixia Zhang
  • Qingmin Pan
  • Yichun Xie
  • Yongfei Bai
Research Article

Abstract

Our understanding of the patterns and drivers of soil microbial communities at the regional scale remains inadequate although both have been extensively studied in plant communities. In this study, we examined the patterns and drivers of soil microbial communities using data from 24 arid and semi-arid ecosystem sites, covering a broad range of community types, soils, and climates on the Mongolian Plateau. Our findings demonstrated that, at the regional scale, the total soil microbial biomass, fungal biomass, bacterial biomass, and actinomycete biomass increased with mean annual precipitation, soil organic carbon (SOC), total soil nitrogen (TSN), C:N ratio, annual aboveground net primary productivity (ANPP), and root biomass. However, these values decreased with increasing soil pH and mean annual temperature and showed hump-shaped relationships with plant species richness (SR) and ANPP. Variations in soil microbial communities were associated with precipitation, plant community (SR, ANPP, and BB), and soil properties (SOC, TSN, and pH). At the local scale in a typical steppe, water addition by 30 % increased the total microbial biomass by 20 %, bacterial biomass by 16 %, and actinomycete biomass by 54 %. The increased microbial biomass, however, was still 25–41 % lower than that in the meadow steppe that received similar amount rainfall, indicating that, apart from the dominant effect of precipitation, plant community and soil properties could also regulate soil microbial communities. Our findings have important implications for understanding the impacts of climate change (e.g., precipitation) on soil microbial communities and linkages to ecosystem functioning in the Inner Mongolia grasslands and elsewhere.

Keywords

The Inner Mongolia grassland transect Precipitation gradient PLFA Soil microbial community Plant community Soil properties 

Notes

Acknowledgments

We thank Professor Erland Bååth for his help in MIDI Sherlock Microbial Identification System, and Huasong Chen for his help in soil microbial community analysis. We also thank two anonymous reviewers for their comments and Bruce Jaffee and Sean Bloszies for polishing the language on the manuscript. We acknowledge students from the Inner Mongolia Agriculture University, Inner Mongolia University, and Northwest Agriculture and Forestry University for their help with field work. This study was supported by the Natural Science Foundation of China (31030013, 31320103916 and 31100335), Strategic Priority Research Program of the Chinese Academy of Sciences (XDA05050400), and Land-Cover/Land-Use Program at NASA (Grant no NNX09AK87G).

Supplementary material

10980_2014_9996_MOESM1_ESM.doc (2 mb)
Supplementary material 1 (DOC 2080 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Dima Chen
    • 1
  • Jia Mi
    • 1
  • Pengfei Chu
    • 1
  • Junhui Cheng
    • 1
  • Lixia Zhang
    • 1
  • Qingmin Pan
    • 1
  • Yichun Xie
    • 2
  • Yongfei Bai
    • 1
  1. 1.State Key Laboratory of Vegetation and Environmental Change, Institute of BotanyChinese Academy of SciencesBeijingPeople’s Republic of China
  2. 2.Department of Geography and GeologyEastern Michigan UniversityYpsilantiUSA

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