Abstract
Background and aims
Rhizodeposited-carbon (C) plays an important role in regulating soil C concentrations and turnover, however, the distribution of rhizodeposited-C into different soil organic carbon (SOC) pools and how regulated by nitrogen (N) fertilization still remains elusive.
Methods
We applied five N fertilization rates (0, 10, 20, 40, and 60 mg N kg−1 soil) to rice (Oryza sativa L.) with continuously labeled 13CO2 for 18 days, to measure 13C allocation into plant tissues and soil C fractions.
Results
Relative to the unfertilized controls, the ratio of 13C in plant aboveground shoot /belowground root increased as a result of N fertilization, and the contribution of rhizodeposited-C to SOC was increased by N fertilization, presumably due to the relatively high root biomass and exudates. Also, N fertilization increased 13C incorporation into large aggregates (0.25–2.0 mm) and the humic acid fraction. Biological C immobilization might occur and preserve rhizodeposition following high rates of N addition, which regulates rhizodeposits and C cycling, thus determining the stabilization of rhizodeposits in the different SOC pools.
Conclusion
Rhizodeposited-C from rice plants and its distribution within SOC pools strongly depend upon N fertilization, thus determines C sequestration potential from the rice plants.
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Abbreviations
- SOC :
-
Soil organic carbon
- TN :
-
Soil total nitrogen
- DOC :
-
Dissolved organic carbon
- MBC :
-
Microbial biomass carbon
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Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (41522107; 31470629; 41671233), the Youth Innovation Team Project of Institute of Subtropical Agriculture, Chinese Academy of Sciences [grant number, 2017QNCXTD_GTD] and Royal Society Newton Advanced Fellowship (NA150182). We especially thank the Public Service Technology Center, Institute of Subtropical Agriculture, Chinese Academy of Sciences for technical assistance.
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Luo, Y., Zhu, Z., Liu, S. et al. Nitrogen fertilization increases rice rhizodeposition and its stabilization in soil aggregates and the humus fraction`. Plant Soil 445, 125–135 (2019). https://doi.org/10.1007/s11104-018-3833-0
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DOI: https://doi.org/10.1007/s11104-018-3833-0