Despite the measured short-term variability between net air–saltpan CO 2 influx and emission estimates found during the dry and wet season in the Brazilian HTF, the only site with seasonal CO 2 flux measurements, the OC sedimentary profiles over several decades suggest efficient OC burial at all sites. Although these rates are lower than those from nearby mangrove, saltmarsh and seagrass systems, the importance of HTFs as sinks for OC, TN and TP may be significant given their extensive coverage. Here, we estimate that organic carbon (OC), total nitrogen (TN) and total phosphorus (TP) were buried at rates averaging 21 ( ☖), 1.7 ( ☐.3) and 1.4 ( ☐.3) g m - 2 yr - 1, respectively, during the previous century in three contrasting HTF systems, one in Brazil (eutrophic) and two in Australia (oligotrophic). Hypersaline tidal flats (HTFs) are coastal ecosystems with freshwater deficits often occurring in arid or semi-arid regions near mangrove supratidal zones with no major fluvial contributions.
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