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Nitrogen fertilization increases rice rhizodeposition and its stabilization in soil aggregates and the humus fraction
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Nitrogen fertilization increases rice rhizodeposition and its stabilization in soil aggregates and the humus fraction
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Journal Article
Nitrogen fertilization increases rice rhizodeposition and its stabilization in soil aggregates and the humus fraction
2019
Overview
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
13
CO
2
for 18 days, to measure
13
C allocation into plant tissues and soil C fractions.
Results
Relative to the unfertilized controls, the ratio of
13
C 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
13
C 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.
