Abstract
Mangrove sediments are particularly rich in organic matter (OM), derived from both autochthonous and allochthonous sources. Despite the recent focus of science and policy on “Blue Carbon,” understanding dynamics and fate of these OM stocks requires much more than only quantifying organic carbon in mangrove sediments. OM of different origins can be categorized as labile versus recalcitrant compounds, and this decides upon the stability of the stocks of sediment OM. The differential recalcitrance of different classes of organic compounds, however, has rarely been taken into account in studies of marine or coastal OM dynamics. Recently, new developments in molecular and chemical techniques are opening new avenues for tracing back the origin of the OM, providing insight into its chemical composition, and, thus, recalcitrance and stability against decay and mineralization. The resulting information will prove essential for a deeper understanding of long-term dynamics of OM stores in mangrove sediments and should inform sustainable and adaptive management strategies of networks of coastal ecosystems.
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