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Ecosystems

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Autotrophic Bacterial Community and Microbial CO2 Fixation Respond to Vegetation Restoration of Eroded Agricultural Land

  • Haibing Xiao
  • Zhongwu LiEmail author
  • Chuxiong DengEmail author
  • Lin Liu
  • Jia Chen
  • Bin Huang
  • Xiaodong Nie
  • Chun Liu
  • Danyang Wang
  • Jieyu Jiang
Article
  • 27 Downloads

Abstract

Vegetation restoration can dramatically affect soil carbon (C), nitrogen (N) pools and microbial communities. Yet, it is uncertain what effects of vegetation restoration have on autotrophic bacterial community and associated C-fixing potential. To investigate the responses of autotrophic bacterial community and microbial C-fixing rate to vegetation restoration of eroded agricultural land, three abandoned croplands (ES1, ES2 and ES3) and two secondary grasslands planted with Coronilla varia (GS1 and GS2) in the Qiaozi watershed of Chinese Loess Plateau were selected, and high-throughput sequencing and 13C stable isotope labeling were applied in this study. Results showed that vegetation restoration significantly (P < 0.05) improved soil C and N contents while reduced soil moisture level. Total autotrophic bacterial abundance and species diversity in nutrient-rich secondary grasslands were significantly (P < 0.05) lower than those in nutrient-poor croplands. However, positive responses of obligate autotrophic bacteria, such as Alkalililimnicola and Synechococcus, to vegetation restoration were observed. Correlation analysis showed that autotrophic bacterial abundance and diversity were positively (P < 0.05) correlated with soil moisture, while negatively (P < 0.05) correlated with soil C and N nutrients. Microbial C-fixing rate ranged from 0.621 to 1.414 Mg C km−2 y−1 and the maximum value was observed in the ES3 site, followed by the ES1 site (1.088 Mg C km−2 y−1). Microbial C-fixing rate in abandoned cropland was significantly (P < 0.05) higher than that in secondary grassland, and it was positively influenced by autotrophic bacterial abundance and diversity. Overall, vegetation restoration of eroded agricultural land has negative impacts on autotrophic bacterial community and microbial C-fixing potential. In arid and semi-arid regions, great transpiration loss induced by vegetation restoration may inhibit autotrophic bacteria growth, and which further reduces the potential of CO2 fixation by autotrophic bacteria.

Keywords

erosion vegetation restoration organic carbon autotrophic bacteria CO2 fixation Chinese Loess Plateau 

Notes

Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (2017YFC0505401), the ‘Hundred-talent Project’ of the Chinese Academy of Sciences and the National Natural Science Foundation of China (41271294). We would like to thank Hao Peng of the Hunan University for the soil sample collection and Zhilin Pei of the Institute of Soil and Water Conservation CAS and MWR for the output of Figure 1.

Supplementary material

10021_2019_369_MOESM1_ESM.docx (13 kb)
Supplementary material 1 (DOCX 13 kb)
10021_2019_369_MOESM2_ESM.docx (178 kb)
Supplementary material 2 (DOCX 179 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Haibing Xiao
    • 1
    • 2
  • Zhongwu Li
    • 1
    • 2
    • 3
    Email author
  • Chuxiong Deng
    • 1
    Email author
  • Lin Liu
    • 2
  • Jia Chen
    • 2
  • Bin Huang
    • 4
  • Xiaodong Nie
    • 4
  • Chun Liu
    • 3
  • Danyang Wang
    • 3
  • Jieyu Jiang
    • 3
  1. 1.College of Resources and Environmental SciencesHunan Normal UniversityChangshaPeople’s Republic of China
  2. 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess PlateauInstitute of Soil and Water Conservation CAS and MWRYanglingPeople’s Republic of China
  3. 3.College of Environmental Science and EngineeringHunan UniversityChangshaPeople’s Republic of China
  4. 4.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementGuangdong Institute of Eco-environmental Science & TechnologyGuangzhouPeople’s Republic of China

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