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Journal of Soils and Sediments

, Volume 19, Issue 2, pp 809–821 | Cite as

Microbial biomass, metabolic functional diversity, and activity are affected differently by tillage disturbance and maize planting in a typical karst calcareous soil

  • Dan Xiao
  • Shuangshuang Xiao
  • Yingying Ye
  • Wei ZhangEmail author
  • Xunyang He
  • Kelin WangEmail author
Soils, Sec 3 • Remediation and Management of Contaminated or Degraded Lands • Research Article
  • 120 Downloads

Abstract

Purpose

Cultivation can affect soil microbial activities, with consequences for microorganisms that metabolize soil organic carbon and release CO2 to the atmosphere. Nevertheless, there is limited understanding of the short-term effects that tillage disturbance, maize planting, or their interactions exert on microbial biomass and metabolic function in a typical karst calcareous soil. A 1-year simulation experiment quantified the impacts of tillage disturbance and maize planting on soil microorganisms.

Materials and methods

Four treatments (2 × 2 m plot size), comprising conventional tillage with (CTM) and without maize (CT), and non-tillage with (NTM) and without (NT) maize, were conducted. Microbial biomass carbon (MBC), carbon metabolic function (Biolog profiles), CO2 flux, soil organic carbon (SOC), and dissolved organic carbon (DOC) were measured after 1-year tillage disturbance and maize planting.

Results and discussion

DOC was significantly lower in CTM, NTM, and CT than in NT, but SOC was slightly higher in NTM than in CTM and NT. Annual cumulative CO2 fluxes were significantly higher in CTM and NTM than in CT, which in turn was significantly higher than NT. Principal component analysis (PCA) suggests microbial community catabolic function differs in all treatments. CT showed significantly decreased MBC compared with NT, but significantly increased microbial metabolic activity and Simpson index (D). Compared with NT, NTM showed significantly increased microorganism metabolic activity, Shannon index (H), and D, but no significant difference in MBC. The interactions between maize planting and tillage disturbance had no significant effect on MBC or metabolic function diversity.

Conclusions

Microbial biomass appears sensitive to tillage disturbance, while microbial metabolic activity is sensitive to maize planting. Maize planting with no tillage would increase CO2 emissions through enhanced microbial activity, but, at the same time, mitigate SOC loss due to an increase in C input by crop residues and roots left in the soil.

Keywords

Karst soils Maize planting Microbial biomass carbon Microbial metabolic function Tillage disturbance 

Notes

Funding information

The study was supported by the National Key Research and Development Program (2016YFC0502400), the National Key Basic Research Program of China (2015CB452703), the National Natural Science Foundation of China (31670529; 41471445), and Guangxi Natural Science Foundation Program (2017GXNSFAA198028).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical AgricultureChinese Academy of SciencesChangshaChina
  2. 2.Huanjiang Observation and Research Station for Karst EcosystemsChinese Academy of SciencesHuanjiangChina
  3. 3.University of Chinese Academy of SciencesBeijingChina
  4. 4.Key Laboratory of Environment Change and Resources Use in Beibu Gulf (Guangxi Teachers Education University)Ministry of EducationNanningChina

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