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Seasonal dynamics and depth distribution of belowground biomass carbon and nitrogen of extensive grassland and a Miscanthus plantation

  • Christopher PoeplauEmail author
  • Kai Germer
  • Kai-Uwe Schwarz
Regular Article
  • 174 Downloads

Abstract

Background and aims

Belowground carbon (C) inputs are a major source of soil organic carbon (SOC) in terrestrial ecosystems, and substrate C:N ratios drive SOC stabilisation. In perennial systems, quantitative information on seasonal dynamics of belowground biomass is scarce, but necessary, e.g. to improve SOC modelling and representative sampling.

Methods

Seasonal dynamics and depth distribution of belowground biomass C and N of extensive grassland and Miscanthus on sandy soil were estimated. Core samples (1 m depth) were taken six times in 1 year. Miscanthus-derived SOC was quantified using 13C natural abundance.

Results

Grassland and Miscanthus differed strongly in belowground biomass C (2.5 ± 0.3 vs. 7.3 ± 1.1 Mg ha−1) and C:N ratios (28.6 ± 0.5 vs. 60 ± 3.3). Peak grassland belowground biomass C and N stocks occurred in summer, while those of rhizomatous Miscanthus were in winter due to different strategies of resource allocation. Grassland roots showed a strong seasonal pattern of C:N ratios, indicating N remobilisation. Miscanthus-derived topsoil SOC was low relative to the high belowground biomass, indicating a slow transfer of rhizome carbon to bulk SOC.

Conclusions

Representative belowground biomass sampling of perennials should take seasonal dynamics into account, especially in system comparisons. Furthermore, C inputs from rhizome and roots should be estimated separately owing to likely differences in turnover times.

Keywords

Roots Rhizome Perennial C:N ratio 13

Notes

Acknowledgements

This study was financed by the German Federal Ministry of Food and Agriculture as part of the German Agricultural Soil Inventory. We thank Anja Müller for her endurance in root washing and students of the technical university of Braunschweig for measuring basic soil parameters.

Supplementary material

11104_2019_4074_MOESM1_ESM.xlsx (26 kb)
ESM 1 (XLSX 25 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Christopher Poeplau
    • 1
    Email author
  • Kai Germer
    • 2
  • Kai-Uwe Schwarz
    • 3
  1. 1.Thünen Institute of Climate-Smart AgricultureBraunschweigGermany
  2. 2.Institute of Geoecology, Department of Soil Science and Soil PhysicsTechnical University of BraunschweigBraunschweigGermany
  3. 3.Julius Kühn Institute for Crop and Soil ScienceBraunschweigGermany

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