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Tidal restriction likely has greater impact on the carbon sink of coastal wetland than climate warming and invasive plant

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Abstract

Aims

Coastal salt marshes are productive ecosystems that are highly efficient carbon sinks, but there is uncertainty regarding the interactions among climate warming, plant species, and tidal restriction on C cycling.

Methods

Open-top chambers (OTCs) were deployed at two coastal wetlands in Yancheng, China, where native Phragmites australis (Phragmites) and invasive Spartina alterniflora (Spartina) were dominant, respectively. Two study locations were set up in each area based on difference in tidal action. The OTCs achieved an increase of average daytime air temperature of ~ 1.11–1.55 °C. Net ecosystem CO2 exchange (NEE), ecosystem respiration (Reco), CH4 fluxes, aboveground biomass and other abiotic factors were monitored over three years.

Results

Warming reduced the magnitude of the radiative balance of native Phragmites, which was determined to still be a consistent C sink. In contrast, warming or tidal flooding presumably transform the Spartina into a weak C source, because either warming-induced high salinity reduced the magnitude of NEE by 19% or flooding increased CH4 emissions by 789%. Remarkably, native Phragmites affected by tidal restrictions appeared to be a consistent C source with the radiative balance of 7.11–9.64 kg CO2-eq m–2 yr–1 because of a reduction in the magnitude of NEE and increase of CH4 fluxes.

Conclusions

Tidal restrictions that disconnect the tidal hydrologic connection between the ocean and land may transform coastal wetlands from C sinks to C sources. This transformation may potentially be an even greater threat to coastal carbon sequestration than climate warming or invasive plant species in isolation.

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Data availability

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

Abbreviations

OTCs:

Open-top chambers

NEE:

Net ecosystem CO2 exchange

R eco :

Ecosystem respiration

C:

Carbon

SGWP:

Sustained-flux global warming potential

SGCP:

Sustained-flux global cooling potential

GHG:

Greenhouse Gas

GPP:

Gross primary production

AGB:

Above ground biomass

WTD:

Water table depth

CROWNs:

Coastal-wetland Research On Warming Networks

UGGA:

Ultra-Portable Greenhouse Gas Analyzer

OMS:

Online monitoring systems

TC:

Total C

SOC:

Soil organic C

TN:

Total nitrogen

CI:

Confidence interval (95%)

Fe:

Iron

Zn:

Zinc

Cu:

Copper

CIA:

The chemical index of alteration

References

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Acknowledgements

This research was jointly funded by Laoshan Laboratory (LSKJ2022040003), the National Natural Science Foundation of China (No. U22A20558), the Natural Science Foundation of Shandong Province (ZR2023MD060), the National Key R&D Program of China (2016YFE0109600), the Foundation of the Yellow Sea Wetland Research Institute (20210108), and the China Geological Survey Program (DD20221775 & DD20189503). We would like to express our gratitude to the two reviewers for their constructive comments on the revisions. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Funding

This research was jointly funded by Laoshan Laboratory (LSKJ2022040003), the National Natural Science Foundation of China (No. U22A20558), the Natural Science Foundation of Shandong Province (ZR2023MD060), the National Key R&D Program of China (2016YFE0109600), the Foundation of the Yellow Sea Wetland Research Institute (20210108), and the China Geological Survey Program (DD20221775 & DD20189503).

Author information

Authors and Affiliations

Authors

Contributions

Conceptualisation: Siyuan Ye, Ken W Krauss, Samantha K. Chapman, Shucheng Xie; Methodology: Siyuan Ye, Ken W Krauss, Pan Zhou, Liujuan Xie, Lixin Pei; Investigation: Pan Zhou, Liujuan Xie, Lixin Pei, Hongming Yuan, Shixiong Yang, Xigui Ding; Resources: Siyuan Ye; Formal Analysis: Pan Zhou, Siyuan Ye, Edward A. Laws; Writing – Original Draft Preparation: Pan Zhou; Writing – Review & Editing: all.

Corresponding author

Correspondence to Siyuan Ye.

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Competing interests

The authors have no relevant financial or non-financial interests to disclose.

Additional information

Responsible Editor: Zucong Cai.

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Zhou, P., Ye, S., Xie, L. et al. Tidal restriction likely has greater impact on the carbon sink of coastal wetland than climate warming and invasive plant. Plant Soil 492, 135–156 (2023). https://doi.org/10.1007/s11104-023-06160-x

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  • DOI: https://doi.org/10.1007/s11104-023-06160-x

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