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Biology and Fertility of Soils

, Volume 53, Issue 4, pp 419–429 | Cite as

Nitrogen fertilization increases rhizodeposit incorporation into microbial biomass and reduces soil organic matter losses

  • Huadong Zang
  • Evgenia Blagodatskaya
  • Jinyang Wang
  • Xingliang Xu
  • Yakov Kuzyakov
Original Paper

Abstract

Agricultural soils receive large amounts of anthropogenic nitrogen (N), which directly and indirectly affect soil organic matter (SOM) stocks and CO2 fluxes. However, our current understanding of mechanisms on how N fertilization affects SOM pools of various ages and turnover remains poor. The δ13C values of SOM after wheat (C3)-maize (C4) vegetation change were used to calculate the contribution of C4-derived rhizodeposited C (rhizo-C) and C3-derived SOM pools, i.e., rhizo-C and SOM. Soil (Ap from Haplic Luvisol) sampled from maize rhizosphere was incubated over 56 days with increasing N fertilization (four levels up to 300 kg N ha−1), and CO2 efflux and its δ13C were measured. Nitrogen fertilization decreased CO2 efflux by 27–42% as compared to unfertilized soil. This CO2 decrease was mainly caused by the retardation of SOM (C3) mineralization. Microbial availability of rhizo-C (released by maize roots within 4 weeks) was about 10 times higher than that of SOM (older than 4 weeks). Microbial biomass and dissolved organic C remained at the same level with increasing N. However, N fertilization increased the relative contribution of rhizo-C to microbial biomass by two to five times and to CO2 for about two times. This increased contribution of rhizo-C reflects strongly accelerated microbial biomass turnover by N addition. The decomposition rate of rhizo-C was 3.7 times faster than that of SOM, and it increased additionally by 6.5 times under 300 kg N ha−1 N fertilization. This is the first report estimating the turnover and incorporation of very recent rhizo-C (4 weeks old) into soil C pools and shows that the turnover of rhizo-C was much faster than that of SOM. We conclude that the contribution of rhizo-C to CO2 and to microbial biomass is highly dependent on N fertilization. Despite acceleration of rhizo-C turnover, the increased N fertilization facilitates C sequestration by decreasing SOM decomposition.

Keywords

CO2 partitioning C3-C4 vegetation change Microbial biomass SOM decomposition Nutrient availability 

Notes

Acknowledgements

We thank the China Scholarship Council for funding to Huadong Zang in Germany. This study was supported by Deutsche Forschungsgemeinschaft (DFG; KU-1184/13-2) within the Research Unit: Soil Food Webs. EB’s participation was supported by the Russian Science Foundation (project no. 14-14-00625). The isotopic analyses were performed at the Kompetenzzentrum Stabile Isotope (KOSI), Goettingen. The authors also would like to thank Karin Schmidt and Anita Kriegel for their laboratory assistance.

Supplementary material

374_2017_1194_MOESM1_ESM.docx (479 kb)
Fig. S1 (DOCX 479 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Huadong Zang
    • 1
  • Evgenia Blagodatskaya
    • 1
    • 2
    • 3
  • Jinyang Wang
    • 4
  • Xingliang Xu
    • 5
  • Yakov Kuzyakov
    • 1
    • 2
  1. 1.Department of Agricultural Soil ScienceUniversity of GöttingenGöttingenGermany
  2. 2.Department of Soil Science and Temperate EcosystemsUniversity of GöttingenGöttingenGermany
  3. 3.Institute of Physicochemical and Biological Problems in Soil ScienceRussian Academy of SciencesPushchinoRussia
  4. 4.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil ScienceChinese Academy of SciencesNanjingChina
  5. 5.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural ResourcesChinese Academy of SciencesBeijingChina

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