Hypersaline tidal flats as important “blue carbon” systems: a case study from three ecosystems
نویسندگان
چکیده
Abstract. Hypersaline tidal flats (HTFs) are coastal ecosystems with freshwater deficits often occurring in arid or semi-arid regions near mangrove supratidal zones no major fluvial contributions. Here, we estimate that organic carbon (OC), total nitrogen (TN) and phosphorus (TP) were buried at rates averaging 21 (±6), 1.7 (±0.3) 1.4 gm-2yr-1, respectively, during the previous century three contrasting HTF systems, one Brazil (eutrophic) two Australia (oligotrophic). Although these lower than those from nearby mangrove, saltmarsh seagrass importance of HTFs as sinks for OC, TN TP may be significant given their extensive coverage. Despite measured short-term variability between net air–saltpan CO2 influx emission estimates found dry wet season Brazilian HTF, only site seasonal flux measurements, OC sedimentary profiles over several decades suggest efficient burial all sites. Indeed, stable isotopes (?13C ?15N) along C:N ratios show microphytobenthos source HTFs. Our findings highlight a previously unquantified well nutrient sink could included emerging blue framework.
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ژورنال
عنوان ژورنال: Biogeosciences
سال: 2021
ISSN: ['1726-4189', '1726-4170']
DOI: https://doi.org/10.5194/bg-18-2527-2021