Tidal wetlands are global hotspots of carbon storage but errors exist with current estimates on their carbon density due to the use of factors estimated from other habitats for converting loss-on-ignition (LOI) to organic carbon (OC); and the omission of certain significant carbon pools. Here we show that the widely used conversion factor (LOI/OC = 1.724) is significantly lower than our measurements for saltmarsh sediments (1.92 ± 0.01) and oversimplifies the polynomial relationship between sediment OC and LOI for mangrove forests. Global mangrove OC stock in the top-meter sediment reaches 1.93 Pg when corrected for this bias, and is 20% lower than the previous estimates. Ecosystem carbon stock (living and dead biomass, sediment OC and inorganic carbon) is estimated at 3.7-6.2 Pg. Mangrove deforestation leads to carbon emission rates at 23.5-38.7 Tg yr-1 after 2000. Mangrove sediment OC stock has previously been over-estimated while ecosystem carbon stock underestimated.

中文翻译：

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改进了对全球潮汐湿地碳储量和碳库的估算。

潮汐湿地是全球碳储存的热点地区，但由于使用了其他生境中估计的因子将燃烧损失（LOI）转换为有机碳（OC），因此目前对其碳密度的估计存在误差。并省略了某些重要的碳库。在这里，我们表明，广泛使用的转换因子（LOI / OC = 1.724）显着低于盐沼沉积物的测量值（1.92±0.01），并且过分简化了红树林的沉积物OC和LOI之间的多项式关系。对此偏差进行校正后，最高表层沉积物中的全球红树林OC存量达到1.93 Pg，比先前的估算值低20％。生态系统的碳储量（活和死生物量，沉积物OC和无机碳）估计为3.7-6.2 Pg。红树林的砍伐导致碳排放量达到23.5-38。