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Improved estimates on global carbon stock and carbon pools in tidal wetlands

Environmental Studies and Forestry

Improved estimates on global carbon stock and carbon pools in tidal wetlands

X. Ouyang and S. Y. Lee

This groundbreaking research by Xiaoguang Ouyang and Shing Yip Lee uncovers critical inaccuracies in the measurement of carbon density in tidal wetlands. Discover how the new findings significantly revise our understanding of mangrove and saltmarsh carbon stocks, revealing an alarming underestimation of these vital ecosystems' contributions to carbon storage.

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Playback language: English
Abstract
Tidal wetlands are crucial carbon sinks, but existing estimates of their carbon density contain errors due to inaccurate conversion factors from loss-on-ignition (LOI) to organic carbon (OC) and the exclusion of significant carbon pools. This study reveals that the commonly used LOI/OC conversion factor (1.724) underestimates the actual value for saltmarsh sediments (1.92 ± 0.01) and oversimplifies the relationship for mangrove forests. Correcting for this bias, global mangrove OC stock in the top meter is revised to 1.93 Pg (20% lower than previous estimates). Ecosystem carbon stock (including biomass and sediment carbon) is estimated at 3.7–6.2 Pg, with mangrove deforestation resulting in carbon emission rates of 23.5–38.7 Tg yr⁻¹ after 2000. Previous studies overestimated mangrove sediment OC stock while underestimating ecosystem carbon stock.
Publisher
Nature Communications
Published On
Jan 16, 2020
Authors
Xiaoguang Ouyang, Shing Yip Lee
Tags
carbon sinks
tidal wetlands
loss-on-ignition
organic carbon
mangrove forests
carbon emissions

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