While the widely used conversion factors from organic matter to OC (e.g., 0.58 or 1.724 for OC to LOI) is commonplace in C stock estimates, these conversion factors only apply to some soils or specific components of soils, and has been found to be too low for most soils 12. Loss-on-ignition (LOI) has been widely used for estimating sediment organic matter and thus a proxy for OC 10, 11.
However, the current estimates on sediment carbon stock in mangrove forests are not satisfactorily constrained due to the large variation (72–936 Mg ha −1) in individual observations and the use of conversion factors inferred from other habitats for estimating organic carbon (OC) from organic matter, without reference to potential variability associated with specific sediment types.
A large number of studies have estimated sediment/ecosystem carbon stock and density in blue carbon ecosystems 7, 8, 9. Owing to the high carbon accumulation capacity, mangrove conservation and reforestation have been promoted in international initiatives for mitigating the risk of climate change 6.
The anaerobic sedimentary environment, high autotrophic production and ability to trap allochthonous (marine and/or riverine) sediment input 4, 5 promote long-term carbon storage in these coastal ecosystems. Tidal vegetated wetlands (mangroves and saltmarshes) are blue carbon ecosystems 1 that are highly efficient in sequestering and storing carbon for mitigating climate change 2, 3.
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