Environmental and biological controls on methyl halide emissions from southern California coastal salt marshes
Tóm tắt
Methyl bromide (CH3Br) and methyl chloride(CH3Cl) emission rates from southernCalifornia coastal salt marshes show largespatial and temporal variabilities that arestrongly linked to biological and environmentalfactors. Here we discuss biogeochemical linesof evidence pointing to vegetation as theprimary source of CH3Br and CH3Clemissions from salt marshes. Sediments andmacroalgae do not appear to be major producersof these compounds, based on observations thatthe highest fluxes are not inhibited by soilinundation; their emissions are not correlatedwith those of certain gases produced in soils;and emissions from mudflat- andmacroalgae-dominated sites are relativelysmall. In contrast, the seasonal and spatialvariabilities of methyl halide fluxes in thesesalt marshes are consistent with the productionof these compounds by vascular plants, althoughthe possibility of production by microflora orfungi associated with the salt marsh vegetationis not ruled out. Flux chamber measurements ofemission rates are largely correlated to theoverall plant biomass enclosed in the chamber,but appear also to be highly dependent on thepredominant plant species. Emission ratesfollow a diurnal trend similar to the trends ofambient air temperature and photosyntheticallyactive radiation, but not surface soiltemperature. Diurnal variabilities in thecarbon isotope compositions of CH3Cl andCH3Br and their relative ratios ofemissions are consistent with simultaneouslycompeting mechanisms of uptake andproduction.
Tài liệu tham khảo
Attieh JM, Hanson AD& Saini HS (1995) Purification and characterization of a novel methyltransferase responsible for biosynthesis of halomethanes and methanethiol in Brassica oleracea. J. Biol. Chem. 270: 9250–9257
Bartlett KB (1985) Methane flux from coastal salt marshes. J. Geophys. Res. 90: 5710–5720
Bill M, Rhew RC, Weiss RF& Goldstein AH (2002) Carbon isotope ratios of methyl bromide and methyl chloride emitted from a coastal salt marsh (DOI 10.1029/2001GL012946). Geophys. Res. Lett. 29: 4-1–4-4
Braus-Stromeyer SA, Cook AM& Leisinger T (1993) Biotransformation of chloromethane to methanethiol. Environ. Sci. Technol. 27: 1577–1579
Chanton JP& Whiting GJ (1995) Trace gas exchange in freshwater and coastal marine environments: ebullition and transport by plants. In: Matson PA& Harriss RC (Ed) Biogenic Trace Gases: Measuring Emissions from Soil and Water (pp 98–125). Blackwell Science, Oxford, England
Cicerone RJ (1975) Comment on ‘Volcanic emissions of halides and sulfur compounds to the troposphere and stratosphere’ by R.D. Cadle. J. Geophys. Res. 80: 3911–3912
Cicerone RJ, Stedman DH& Stolarski RS (1975) Estimate of late 1974 stratospheric concentration of gaseous chlorine compounds (ClX). Geophys. Res. Lett. 2: 219–222
Dacey JWH, King GM& Wakeham SG (1987) Factors controlling emission of dimethylsulphide from salt marshes. Nature 330: 643–645
Devai I& DeLaune RD (1995) Formation of volatile sulfur compounds in salt marsh sediment as influenced by soil redox condition. Org. Geochem. 23: 283–287
Dimmer CH, Simmonds PG, Nickless G& Bassford MR (2001) Biogenic fluxes of halomethanes from Irish peatland ecosystems. Atmos. Environ. 35: 321–330
Gan J, Yates SR, Ohr HD& Sims JJ (1998) Production of methyl bromide by terrestrial higher plants. Geophys. Res. Lett. 25: 3595–3598
Graedel TE & Keene WC (1995) Tropospheric budget of reactive chlorine. Glob. Biogeochem. Cycles 9: 47–77
Groszko W& Moore RM (1998) Ocean-atmosphere exchange of methyl bromide: NW Atlantic and Pacific Ocean studies. J. Geophys. Res. 103: 16737–16741
Harper DB (1985) Halomethane from halide ion - a highly efficient fungal conversion of environmental significance. Nature 315: 55–57
Harper DB (2000) The global chloromethane cycle: biosynthesis, biodegradation and metabolic role. Nat. Prod. Rep. 17: 337–348
Joshi CP& Chiang VL (1998) Conserved sequence motifs in plant S-adenosyl-L-methioninedependent methyltransferases. Plant Molec. Biol. 37: 663–674
Khalil MAK& Rasmussen RA (1999) Atmospheric methyl chloride. Atmos. Environ. 33: 1305–1321
Kurylo MJ& Rodriguez JM (1999) Short-lived ozone-related compounds. In: Albritton DL, Watson RT& Aucamp PJ (Ed) Scientific Assessment of Ozone Depletion: 1998. Report no. 44, World Meteorological Organization, Geneva
Kwak TJ& Zedler JB (1997) Food web analysis of southern California coastal wetlands using multiple stable isotopes. Oecologia 110: 262–277
Lin XY, Kaul SS, Rounsley S, Shea TP, Benito MI, Town CD, Fujii CY, Mason T, Bowman CL, Barnstead M, Feldblyum TV, Buell CR, Ketchum KA, Lee J, Ronning CM, Koo HL, Moffat KS, Cronin LA, Shen M, Pai G, Van Aken S, Umayam L, Tallon LJ, Gill JE, Adams MD, Carrera AJ, Creasy TH, Goodman HM, Somerville CR, Copenhaver GP, Preuss D, Nierman WC, White O, Eisen JA, Salzberg SL, Fraser CM& Venter JC (1999) Sequence and analysis of chromosome 2 of the plant Arabidopsis thaliana. Nature 402: 761–768
Lobert JM, Butler JH, Montzka SA, Geller LS, Myers RC& Elkins JW (1995) A net sink for atmospheric CH3Br in the east Pacific Ocean. Science 267: 1002–1005
Lobert JM, Yvon-Lewis SA, Butler JH, Montzka SA& Myers RC (1997) Undersaturation of CH3Br in the Southern Ocean. Geophys. Res. Lett. 24: 171–172
Manley SL& Dastoor MN (1988) Methyl iodide (CH3I) production by kelp and associated microbes. Mar. Biol. 98: 477–482
Mansfield SD& Barlocher F (1993) Seasonal variation of fungal biomass in the sediment of a salt marsh in New Brunswick. Microbial Ecology 26: 37–45
Millero FJ& Sohn ML (1992) Chemical Oceanography. CRC Press, Boca Raton
Moore RM, Groszko W& Niven SJ (1996) Ocean-atmosphere exchange of methyl chloride: Results from NWAtlantic and Pacific Ocean studies. J. Geophys. Res. 101: 28529–28538
Moore RM& Webb M (1996) The relationship between methyl bromide and chlorophyll a in high latitude ocean waters. Geophys. Res. Lett. 23: 2951–2954
Morrison MC& Hines ME (1990) The variability of biogenic sulfur flux from a temperate salt marsh on short time and space scales. Atmos. Environ. 24A: 1771–1779
Muramatsu Y& Yoshida S (1995) Volatilization of methyl iodide from the soil-plant system. Atmos. Environ. 29: 21–25
Ni XH& Hager LP (1998) cDNA cloning of Batis maritima methyl chloride transferase and purification of the enzyme. Proc. Nat. Acad. Sci. 95: 12866–12871
Ni XH& Hager LP (1999) Expression of Batis maritima methyl chloride transferase in Escherichia coli. Proc. Nat. Acad. Sci. 96: 3611–3615
O'Doherty S, Simmonds PG, Cunnold DM, Wang HJ, Sturrock GA, Fraser PJ, Ryall D, Derwent RG, Weiss RF, Salameh P, Miller BR& Prinn RG (2001) In-situ chloroform measurements at Advanced Global Atmospheric Gases Experiment atmospheric research stations from 1994 to 1998. J. Geophys. Res. 106: 20429–20444
Oremland RS, Miller LG& Strohmaier FE (1994) Degradation of methyl bromide in anaerobic sediments. Environ. Sci. Technol. 28: 514–520
Padgett DE& Celio DA (1990) A newly discovered role for aerobic fungi in anaerobic salt marsh soils. Mycologia 82: 791–794
Prinn RG, Weiss RF, Fraser PJ, Simmonds PG, Cunnold DM, Alyea FN, O'Doherty S, Salameh P, Miller BR, Huang J, Wang RHJ, Hartley DE, Harth C, Steele LP, Sturrock G, Midgley PM& McCulloch A (2000) A history of chemically and radiatively important gases in air deduced from ALE/GAGE/AGAGE. J. Geophys. Res. 105: 17751–17792
Redeker KR, Wang NY, Low JC, McMillan A, Tyler SC& Cicerone RJ (2000) Emissions of methyl halides and methane from rice paddies. Science 290: 966–969
Rennenberg H (1991) The significance of higher plants in the emission of sulfur compounds from terrestrial ecosystems. In: Sharkey TD, Holland EA& Mooney HA (Eds) Trace Gas Emissions by Plants (pp 217–265). Academic Press, San Diego
Rhew RC, Miller BR& Weiss RF (2000) Natural methyl bromide and methyl chloride emissions from coastal salt marshes. Nature 403: 292–295
Saini HS, Attieh JM& Hanson AD (1995) Biosynthesis of halomethanes and methanethiol by higher plants via a novel methyltransferase reaction. L. Plant, Cell and Environ. 18: 1027–1033
Saxena D, Aouad S, Attieh J& Saini H (1998) Biochemical characterization of chloromethane emission from the wood-rotting fungus Phellinus pomaceus. Appl. Environ. Microbiol. 64: 2831–2835
Scarratt MG& Moore RM (1996) Production of methyl chloride and methyl bromide in laboratory cultures of marine phytoplankton. Mar. Chem. 54: 263–272
Schauffler SM, Atlas EL, Flocke F, Lueb RA, Stroud V& Travnicek W(1998) Measurements of bromine containing organic compounds at the tropical tropopause. Geophys. Res. Lett. 25: 317–320
Schauffler SM, Heidt LE, Pollock WH, Gilpin TM, Vedder JF, Solomon S, Lueb RA& Atlas EL (1993) Measurements of halogenated organic compounds near the tropical tropopause. Geophys. Res. Lett. 20: 2567–2570
Steudler PA& Peterson BJ (1984) Contribution of gaseous sulfur from salt marshes to the global sulfur cycle. Nature 311: 455–457
Tait VK, Moore RM& Tokarczyk R (1994) Measurements of methyl chloride in the northwest Atlantic. J. Geophys. Res. 99: 7821–7833 UNEP (1992) Report of the Fourth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer, at Copenhagen. United Nations Environment Programme, Copenhagen
Varner RK, Crill PM& Talbot RW (1999) Wetlands: a potentially significant source of atmospheric methyl bromide and methyl chloride. Geophys. Res. Lett. 26: 2433–2436
White RH (1982) Biosynthesis of methyl chloride in the fungus Phellinus pomaceus. Arch. Microbiol. 132: 100–102
Williams J, Wang NY, Cicerone RJ, Yagi K, Kurihara M& Terada F (1999) Atmospheric methyl halides and dimethyl sulfide from cattle. Glob. Biogeochem. Cycles 13: 485–491
WMO (1995) Scientific Assessment of Ozone Depletion: 1994. Report 37, World Meteorological Organization, Geneva
WMO (1999) Scientific Assessment of Ozone Depletion: 1998. Report 44, World Meteorological Organization, Geneva
Woodwell GM, Rich PH& Hall CAS (1973) Carbon in Estuaries. In: Woodwell GM& Pecan EV (Ed) Carbon and the Biosphere (pp 221–240). Symposia in Biology, 24, U.S. Atomic Energy Commission, Washington, D.C.
Wuosmaa AM& Hager LP (1990) Methyl chloride transferase: a carbocation route for biosynthesis of halometabolites. Science 249: 160–162
Zedler JB, Nordby CS& Kus BE (1992) The Ecology of Tijuana Estuary, California: A National Estuarine Research Reserve. NOAA Office of Coastal Resource Management, Sanctuaries and Reserves Division, Washington, D.C.