Abstract
Emissions of biogenic sulphur gases from a Florida Spartina alterniflora zone were measured over several tidal and diel cycles using a dynamic flow chamber technique, corroborating recently published information in the literature. The flux of hydrogen sulfide from individual measurements is shown to vary by over four orders of magnitude, and correlates primarily with the stage of the tidal cycle. In contrast, the fluxes of dimethyl sulphide, carbon disulphide and dimethyl disulphide vary by less than an order of magnitude and correlate primarily with the diurnal temperature changes in the sediment surface. These differences are discussed in terms of the various biological and physical parameters which may regulate the release of reduced sulphur compounds to the atmosphere.
Highlights
Rexxnt studies on the problem of acid precipitation have focused largely on the biogeochemical cycling of SuIphur~on~ining ~om~unds
Oxi~tion of these com~unds leads to the formation of sulphate, which is precipitated as sulphuric acid in rainwater
Influenced marine sediments and salt marshes are a major source of atmospheric H2S (Georgii. 1977; Hansen er al., 1978; Jaeschke et al, 1980; lngvorsen and J&gensen, 1982; Aneja. 1984; Will er a/., 1978) as a result of anaerobic bacterial sulphate reduction and decomposition of organic material
Summary
~~narpkrfc Emironnrnt Voi. 21, No I. pp. 7-12. 1987 Rimed in Greal Eritrin. am44981/%7 s3.00 +o.oo Q 1987 Paganon Journals Ltd. The flux of hydrogen sulfide from individuaf measurementsis shown to vary by over four orders of magnitude,and correhtes primarily with the stageof the tidal cycle.In contrast, the fluxes ofdimethyt sulphide,carbon disulphideand dimethyl disulphide vary by lessthan an order of magnitudeand correlate primarily with !he diurnal temperature changes in the sediment surface. These diflerences are discussedin terms of the various biological and physical parameters which may regulale the release of reduced sulphur compounds to the atmosphere. Key word index: Bioaenic sulphur emissions, salt marshes, hydrogm sulphide, dimcthyl sulphide, carbon
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