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Evaluating soil carbon stability by combining δ13C and soil aggregates after afforestation on agricultural land and thinning management

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Abstract

Background and aims

Afforestation and thinning management are effective ways to mitigate global warming. Soil carbon reconstruction mechanisms can be effectively explored by linking soil aggregates and isotopic 13C.

Methods

Soil samples were collected from agricultural land (AL) and larch plantations (established in 1965 and thinned in1995, UT: 2500 tree‧ha−1, MT: 1867 tree‧ha−1, and ST: 1283 tree‧ha−1). The soil was separated into three aggregate sizes (LMAC: > 2 mm, SMAC: 2–0.25 mm, MIC: 0.25–0.053), minerals associated with organic matter (MAOM: < 0.053 mm), and carbon fractions within macroaggregates.

Results

We found that afforestation on agricultural land significantly increased the mean weight diameter (MWD). However, intensifying thinning decreased MWD by increasing SMAC. Moreover, after afforestation, the carbon concentration in soil aggregates and MAOM significantly decreased, and the carbon stability of macroaggregates weakened but could be strengthened after thinning. Thinning decreased the C/N in the soil aggregates and MAOM when no change in carbon concentration. The effect of thinning intensity on C/N was obvious with decreasing of particle size. The δ13C, mainly controlled by soil aggregates, significantly decreased in each soil aggregate after afforestation but increased after thinning. Additionally, the carbon concentrations, C/N and δ13C of small-size particles (< 0.25 mm) and the distribution of SMAC are important for SOC, C/N, CO2 fluxes and δ13C in bulk soil.

Conclusion

We conclude that soil aggregate distribution is conducive to soil carbon renewal, suggesting that increasing thinning intensity is beneficial for accumulating older carbon and acquiring nitrogen in more stable fractions.

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Data Availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

Abbreviations

LMAC:

Large macroaggregate

SMAC:

Small macroaggregate

MIC:

Microaggregate

MAOM:

Minerals associated with organic matter

cPOM:

Coarse organic matter within macroaggregate

mM:

Microaggregate within macroaggregate

scM:

Silt‐clay sized and minerals within macroaggregate

C:

Carbon

C/N:

Carbon-nitrogen ratio

References

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Acknowledgements

This work was funded by the National Natural Science Foundation of China (41430639, 31800413, 42171051), The authors thank the Changbai Mountains Forest Ecosystem Research Station for support.

Funding

This work was supported by the National Natural Science Foundation of China (41430639, 31800413, 42171051).

Author information

Authors and Affiliations

Authors

Contributions

Yue Zhang contributed to the study conception and design and data collection and analysis, and wrote the first draft of the manuscript. Shicong Geng critically revised the previous and final manuscript. Changcheng Mu collected data. Junhui Zhang read and commented on the final manuscript.

Corresponding author

Correspondence to Junhui Zhang.

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Competing interest

The authors have no relevant financial or nonfinancial interests to disclose.

Additional information

Responsible Editor: Zucong Cai.

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Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Yue Zhang and Shicong Geng contributed equally to the work as co-first authors.

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Zhang, Y., Geng, S., Mu, C. et al. Evaluating soil carbon stability by combining δ13C and soil aggregates after afforestation on agricultural land and thinning management. Plant Soil 487, 567–586 (2023). https://doi.org/10.1007/s11104-023-05956-1

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  • DOI: https://doi.org/10.1007/s11104-023-05956-1

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