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Soil organic nitrogen fraction and sequestration in a buried paddy soil since the Neolithic age

  • Soils, Sec 1 • Soil Organic Matter Dynamics and Nutrient Cycling • Research Article
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Abstract

Purpose

Soil organic nitrogen (SON) biochemistry trends in paddy soils are poorly understood on a long-term scale.

Methods

To explore the effect of land use on SON sequestration, SON and amino acid (AA) fractions were investigated in soil profiles comprising recent and buried paddy soil (BPS) and buried non-paddy soils (BNS). Two ancient paddy soils from Chuodun ruin site, China, were distinguished based on colour and rice phytolith abundance. 14C abundance in soil organic carbon was used to estimate the age of carbonized rice and ancient paddy soil via a liquid scintillation analysis method, dating to 3800–5500 and 960–4000 BC.

Results

The proportions of D-AAs and acidic AAs in BPS, up to 6.13% and 7.73%, respectively, were higher than those in modern paddy soils. D-alanine (and the D-/L- ratio), aspartate, and glutamate increased with soil depth in BPS, and the amount of D-aspartate was linearly and significantly positively correlated with soil depth (p < 0.05). Based on phytolith stability and abundance, the N sequestration rate (NSR: residual N content as a proportion of initial N content) was proposed to indicate the residual N content varied with time. The NSR was estimated as 10.8–91.2% in BPS with a phytolith stability factor of 0.5–0.9.

Conclusion

These data suggest that intermittent continuous high-intensity rice cultivation could increase soil N sequestration potential over the long term, and that N sequestration is not only associated with AA aging in the organic N fraction, but also with biogeochemical processes in BPS and paddy management. In addition, high-intensity rice cultivation can increase N loss risks, and in turn result in large fluctuations in N sequestration.

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Data availability

Data are available upon request to the corresponding author (Shunyao Zhuang).

Abbreviations

AAN:

Amino acid nitrogen

ASN:

Amino sugar nitrogen

NHN:

Non-hydrolyzed nitrogen

NH4 +-N:

Ammonium-nitrogen

UHN:

Unknown hydrolyzed nitrogen

THN:

Total hydrolyzed nitrogen

BPS:

Buried paddy soil

BNS:

Buried non-paddy soil

MPS:

Modern paddy soil

PSM:

Parent soil material

INC:

Initial nitrogen content

NCR:

Nitrogen content of rice plants

SPC:

Soil phytolith content

NSR:

Nitrogen sequestration rate

PSF:

Phytolith stability factor

SON:

Soil organic nitrogen

SOC:

Soil organic carbon

TN:

Total nitrogen

References

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Acknowledgements

The authors thank the individuals who helped with sample collection and analysis. The authors would like to thank Associate Professor Peter Almond from Lincoln University (NZ) for the constructive comments on the manuscript.

Funding

This work was supported by the National Natural Science Foundation of China (41671296) and the National Key R & D Program of China (2016FYE0112700).

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Authors

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Correspondence to Shunyao Zhuang.

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Conflict of interest

The authors declare no competing interests.

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Responsible editor: Zhaoliang Song

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Highlights

• Amino acid N more unstable in paddy soil than in non-paddy soil

• D-AAs and acidic AAs higher in buried paddy soil than modern paddy soil

• D- and D-/L-alanine, aspartate, and glutamate increased in buried paddy soil

• D-aspartate content linearly and significantly positively correlated with soil depth

• Continuous high-intensity rice cultivation could increase N sequestration potential

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Pan, J., Wang, J. & Zhuang, S. Soil organic nitrogen fraction and sequestration in a buried paddy soil since the Neolithic age. J Soils Sediments 23, 2021–2036 (2023). https://doi.org/10.1007/s11368-023-03442-w

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  • DOI: https://doi.org/10.1007/s11368-023-03442-w

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