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Warming and flooding have different effects on organic carbon stability in mangrove soils

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

Purpose

Mangrove ecosystems which play a critical role in global C sequestration have recently become threatened by global warming and sea level rise. This study aimed to explore the responses of SOC mineralization and C pool stability in mangrove ecosystems to warming and flooding conditions.

Methods

Laboratory incubation and solid-state 13C nuclear magnetic resonance (13C-NMR) analysis were used to evaluated soil organic carbon (SOC) mineralization and stability under warming (ST), flooding (SW), warming in coincidence with flooding (SWT), and soil under normal temperature taken from a subtropical mangrove ecosystem in southeastern China.

Results

The cumulative SOC mineralization of ST increased by 24%, while SWT and SW decreased by 59% and 68% relative to CK, respectively. Furthermore, the 13C-NMR analysis showed that O-alkyl C was the dominant SOC chemical composition in all treatments (37.1–43.1%), followed by the aromatic C and alkyl C. The aromaticity index (AI) decreased, and the ratio of alkyl and O-alkyl to aromatic (Alip/Arom) increased in all treatments compared with CK, while the alkyl C/O-alkyl C ratio (A/O-A) and hydrophobicity index (HI) were higher for ST and SW but lower for SWT. Warming significantly facilitated SOC mineralization, and lowered SOC stability due to the high cumulative CO2-C production, while flooding had the opposite effects. However, warming in coincidence with flooding led to low SOC decomposition and a more recalcitrant substance.

Conclusion

The theoretical elevated CO2 release from mangrove soils under warming in coastal zones might be partially offset by prolonged flooding. The different effects on the chemical fractions, chemical compositions, and stability of the SOC pool in mangrove soil under warming and flooding might further complicate the research on coastal carbon sinks.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (42230407) and the National Key R&D Program of China (2022YFF1301301).

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Correspondence to Wenzhi Cao.

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Wang, F., Tao, Y., Yang, S. et al. Warming and flooding have different effects on organic carbon stability in mangrove soils. J Soils Sediments 24, 60–69 (2024). https://doi.org/10.1007/s11368-023-03636-2

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