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Carbon sequestration in soil and biomass under native and non-native mangrove ecosystems

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Abstract

Aims

Mangrove ecosystems can help mitigate climate change by sequestering significant amounts of carbon (C) from the atmosphere and ocean, contributing to regional “blue carbon” stocks. However, it is unclear whether non-native species introduced in coastal wetlands can function as a more efficient carbon sink.

Methods

By examining two dominant mangrove species, native Kandelia obovata (KO) and exotic Sonneratia apetala Buch.-Ham. (SA), at the Qi'ao Island, China, we quantified and compared ecosystem C storage, C sequestration rate, source and stability of soil organic carbon (SOC) under different vegetation covers.

Results & conclusion

Our results showed that both species acted as strong carbon sinks relative to mudflat reference, with overall ecosystem C storage being comparable under KO (410 Mg C ha−1) and SA with different stand ages (224–452 Mg C ha−1), but a few times higher than corresponding unvegetated mudflat. However, by excluding SOC accumulation from prior land use (i.e., unvegetated mudflat), non-native species (i.e., SA) showed a significantly higher ecosystem carbon sequestration rate (8.2–16.4 Mg C ha−1 yr−1) than native KO (4.5 Mg C ha−1 yr−1), owing largely to fast biomass carbon sequestration in SA ecosystem. Relative to mudflat reference, the input of autochthonous source (mangrove tissues) contributed substantially to additional carbon sequestration under mangroves. It should be noted that the relative size of carbon sequestration in non-native mangroves is also affected by factors related to ecosystem, climate, soil properties and land use, the differences still exist among locations, and ecosystem modeling with field validation is desirable for regional estimation of carbon stocks and sequestration rates.

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Acknowledgements

We are grateful to members from Prof. Qin’s lab and staff at the Mangrove Nature Reserve of Qi'ao Island for helping with field work. This work was jointly supported by the National Natural Science Foundation of China (U21A6001, 41975113), and the Guangdong Provincial Department of Science and Technology (2019ZT08G090). Y. Peng was partially supported by the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (SML2020SP004, Nos. 311021003 and 311021004), Guangdong Forestry Science and Technology Innovation Project (2021KJCX012, 2022KJCX019). Contributions of U. Mishra were supported through a U.S. Department of Energy grant to the Sandia National Laboratories, which is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-NA-0003525.

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Correspondence to Zhangcai Qin.

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Zhang, Z., Wang, Y., Zhu, Y. et al. Carbon sequestration in soil and biomass under native and non-native mangrove ecosystems. Plant Soil 479, 61–76 (2022). https://doi.org/10.1007/s11104-022-05352-1

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  • DOI: https://doi.org/10.1007/s11104-022-05352-1

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