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  • Title: Mangrove vegetation enhances soil carbon storage primarily through in situ inputs rather than increasing allochthonous sediments.
    Author: Xiong Y, Liao B, Wang F.
    Journal: Mar Pollut Bull; 2018 Jun; 131(Pt A):378-385. PubMed ID: 29886961.
    Abstract:
    The role of soil carbon (C) in coastal wetlands as a net sink is related to the relative abundance of autochthonous versus allochthonous C. We aimed to investigate soil C sources and the pathways by which mangrove vegetation enhances soil C accumulation. We sampled soil to 1 m depth in seven oceanic mangrove forests and an adjacent un-vegetated mudflat at Dongzhai Bay, China. Stable C isotope technique was used to separate autochthonous and allochthonous C sources. Autochthonous C accounted for 27-97% of soil C stock in the top meter. Soil C density was 1.1-3.6 times higher in mangroves than in the mudflat. Among the increased soil C in mangroves relative to mudflat, autochthonous C accounted for 65-100% of the increments. The results suggest that mangrove vegetation enhances soil C storage primarily through in situ inputs, therefore the substantial soil C stocks commonly found in mangroves play an important role in sequestering atmospheric CO2.
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