Plant intraspecific competition and growth stage alter carbon and nitrogen mineralization in the rhizosphere

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet


  • Yue Sun
  • Huadong Zang
  • Thomas Splettstößer
  • Amit Kumar
  • Xingliang Xu
  • Yakov Kuzyakov
  • Johanna Pausch

Plant roots interact with rhizosphere microorganisms to accelerate soil organic matter (SOM) mineralization for nutrient acquisition. Root-mediated changes in SOM mineralization largely depend on root-derived carbon (root-C) input and soil nutrient status. Hence, intraspecific competition over plant development and spatiotemporal variability in the root-C input and nutrients uptake may modify SOM mineralization. To investigate the effect of intraspecific competition on SOM mineralization at three growth stages (heading, flowering, and ripening), we grew maize (C4 plant) under three planting densities on a C3 soil and determined in situ soil C- and N-mineralization by 13C-natural abundance and 15N-pool dilution approaches. From heading to ripening, soil C- and N-mineralization rates exhibit similar unimodal trends and were tightly coupled. The C-to-N-mineralization ratio (0.6 to 2.6) increased with N availability, indicating that an increase in N-mineralization with N depletion was driven by microorganisms mining N-rich SOM. With the intraspecific competition, plants increased specific root lengths as an efficient strategy to compete for resources. Root morphologic traits rather than root biomass per se were positively related to C- and N-mineralization. Overall, plant phenology and intraspecific competition controlled the intensity and mechanisms of soil C- and N- mineralization by the adaptation of root traits and nutrient mining.

ZeitschriftPlant, Cell and Environment
Seiten (von - bis)1231-1242
Anzahl der Seiten12
PublikationsstatusErschienen - 01.04.2021

Bibliographische Notiz

Funding Information:
Deutsche Forschungsgemeinschaft, Grant/Award Number: project PA 2377/2‐1; RUDN University, Grant/Award Number: program 5‐100; Russian Science Foundation, Grant/Award Number: 19‐77‐30012 Funding information

Funding Information:
We gratefully acknowledge Karin Schmidt, Anita Kriegel, Susann Enzmann, and Ingrid Ostermeyer for their careful help with laboratory and fieldwork. We thank the Laboratory for Radioisotopes (LARI) and Centre for Stable Isotope Research and Analysis (KOSI) of the University of Göttingen. We would also like to thank China Scholarship Council for the fellowship for Yue Sun and Huadong Zang, and the DAAD scholarship award to Amit Kumar. We thank Amanda Troxell and Jiarui Gan for the suggestions on manuscript. The authors would like to thank the editor and two reviewers for constructive comments and suggestions.

Publisher Copyright:
© 2020 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd.