Dissolved inorganic nitrogen cycling in Banzu intertidal sand-flat, Japan
Tóm tắt
The sediment-water exchange of nitrogen, nitrification, denitrification and sedimentary oxygen production were simultaneously measured in the Banzu intertidal sand-flat, Tokyo Bay, Japan. The exchange flux across the sediment-water interface showed a sink of dissolved inorganic nitrogen (DIN) in the light. However, in the dark, the intertidal sediment acted as a source. The diffusive flux obtained by the ammonium profile explained only 22% of the source flux directly measured in the dark, suggesting that bioturbation or excretion by macrofauna greatly contributed to the exchange flux. The total microphytobenthic uptake of DIN estimated from O2 productivity and the Redfield ratio was 573.4 ± 64.4 μmol N m2 h-1, 31% (175.9 ± 64.4 μmol N m-2 h-1) of which was assumed to be derived from the overlying water. The release rate of DIN from the sediment to the water column (1.1 mmol N m-2 day-1) was balanced with the removal rate of DIN from the water column by benthic microalgae on a diurnal basis. This result suggests that DIN was recycled within the sediment, and the microalgae on the sediment surface played a significant role in suppressing the release of mineralized DIN from the sediment. The measured denitrification rate using an acetylene inhibition technique was 99.6 ± 23.5 μmol N m-2 h-1. Since the direct supply of nitrate or nitrite from the water column only accounted for 27% of the total denitrification at the highest estimate, nitrogenous oxide in the sediment pool was the major contributor to sedimentary denitrification.
Tài liệu tham khảo
Asmus, R.M. et al. 1998. The role of water movement and special scaling for measurement of dissolved inorganic nitrogen fluxes in intertidal sediments. Estuarine Coastal and Shelf Science 46: 221–232.
Balderston, W.L., Sherr, B. and Payne, W.J. 1976. Blockage by acetylene of nitrous oxide reduction in Pseudomonas perferctomarinus. Applied and Environmental Microbiology 31: 504–508.
Berner, R.A. 1980. Early diagenesis. A theoretical approach. Princeton.
Bianchi, M., Bonin, P. and Filiatra, M. 1994. Bacterial nitrification and denitrification rates in the Rhône river plume (northwestern Mediterranean Sea). Marine Ecology Progress Series 103: 197–202.
Blackburn, T.H. and Henriksen, K. 1983. Nitrogen cycling in different types of sediments from Danish waters. Limnology and Oceanography 28: 477–493.
Bolalek, J. and Graca, B. 1996. Ammonia nitrogen at the watersediment interface in Puck Bay (Baltic Sea). Estuarine Coastal and Shelf Science 43: 767–779.
Callender, E. and Hammond, D.E. 1982. Nutrient exchange across the sediment-water interface in the Potomac River estuary. Estuarine Coastal and Shelf Science 15: 395–413.
Colijn, F. and de Jonge, V.N. 1984. Primary production of microphytobenthos in the Ems-Dollard estuary. Marine Ecology Progress Series 14: 185–196.
Cowan, J.L.W., Pennock, J.R. and Boynton, W.R. 1996. Seasonal and interannual patterns of sediment-water nutrient and oxygen fluxes in Mobile Bay, Alabama (USA): regulating factors and ecological significance. Marine Ecology Progress Series 141: 229–245.
Falcão, M. and Vale, C. 1990. Study of the Ria Formosa ecosystem: benthic nutrient remineralization and tidal variability of nutrients in the water. Hydrobiologia 207: 137–146.
Gilbert, F.G., Souchu, P., Bianchi, M. and Bonin, P. 1997. Influence of shellfish farming activities on nitrification, nitrate reduction to ammonium and denitrification at the water-sediment interface of the Thau lagoon, France. Marine Ecology Progress Series 151: 143–153.
Herbert, R.A. and Nedwell, D.B., 1990. Role of environmental factors in regulating nitrate respiration in intertidal sediments. pp. 77–90. In: Revsbech, N.P. and Sørensen, J. (eds), Denitrification in soil and sediment. Plenum Press, New York.
Jenkins, M.C. and Kemp, W.M. 1984. The coupling of nitrification and denitrification in two estuarine sediments. Limnology and Oceanography 29: 609–619.
Joye, S.B. and Paerl, H.W. 1993. Contemporaneous nitrogen fixation and denitrification in intertidal microbial mats: rapid response to runoff events. Marine Ecology Progress Series 94: 267–274.
Kaplan, W.A., Teal, J.M. and Valiela, I. 1977. Denitrification in saltmarsh sediments: evidence for seasonal temperature selection among populations of denitrifiers. Microbial Ecology 3: 193–204.
Kasper, H.F., Gillespie, P.A., Boyer, I.C. and Mackenzie, A.L. 1985. Effects of mussel aquaculture on the nitrogen cycle and benthic communities in Kenepuru Sound, New Zealand. Marine Biology 85: 127–136.
Kemp, W.M., Sampou, P.A., Garber, J., Tuttle, J. and Boynton, W.R. 1992. Seasonal depletion of oxygen from bottom waters of Chesapeake Bay: roles of benthic and planktonic respiration and physical exchange processes. Marine Ecology Progress Series 85: 137–152.
Koch, M.S., Maltby, E., Oliver, G.A. and Bakker, S.A. 1992. Factors controlling denitrification rates of tidal mudflats and fringing salt marshes in South-west England. Estuarine Coastal and Shelf Science 34: 471–485.
Koike, I. and Hattori, A. 1978. Simultaneous determinations of nitrification and nitrate reduction in coastal sediments by a 15N dilution technique. Applied and Environmental Microbiology 35: 853–857.
Kristensen, E. 1985. Oxygen and inorganic nitrogen exchange in a Nereis virens(Polychaeta) bioturbated sediment-water system. Journal of Coastal Research 1: 109–116.
Kristensen, E., 1988. Benthic fauna and biogeochemical processes in marine activities and fluxes. pp. 275–299. In: Blackburn, T.H. and Sørensen, J. (eds), Nitrogen cycling in coastal marine environments. John Wiley and Sons, New York.
Kurihara, Y., 1988. Ecology and ecotechnology in estuarine-coastal area. Tokai University Publication, Tokyo (in Japanese).
Li, Y.H. and Gregory, S. 1974. Diffusion of ions in sea water and in deep-sea sediments. Geochimica et Cosmochimica Acta 38: 703–714.
Malone, T.C., Garside, C., Haines, K.C. and Roels, O.A. 1975. Nitrate uptake and growth of Chaetocerossp. in large outdoor continuous cultures. Limnology and Oceanography, 20: 9–19.
Miller-Way, T. and Twilley, R.R. 1996. Theory and operation of continuous flow systems for the study of benthic-pelagic coupling. Marine Ecology Progress Series 140: 257–269.
Nedwell, D.B. and Trimmer, M. 1996. Nitrogen fluxes through the upper estuary of the Great Ouse, England: the role of the bottom sediments. Marine Ecology Progress Series 142: 273–286.
Nishio, T., Koike, I. and Hattori, A. 1982. Denitrification, nitrate reduction, and oxygen consumption in coastal and estuarine sediments. Applied and Environmental Microbiology 43: 648–653.
Ochi, T. and Takeoka, H. 1986. The anoxic water mass in Hiuchi-Nada part 1. Distribution of the anoxic water mass. Journal of Oceanographical Society of Japan 42: 1–11.
Oglivie, B., Nedwell, D.B., Harrison, R.M., Robinson, A. and Sage, A. 1997. High nitrate, muddy estuarine as nitrogen sinks: the nitrogen budget of the River Colne estuary (United Kingdom). Marine Ecology Progress Series 150: 21–228.
Rizzo, W.M., Lackey, G.J. and Christian, R.R. 1992. Significance of euphotic, subtidal sediments to oxygen and nutrient cycling in a temperate estuary. Marine Ecology Progress Series 86: 51–61.
Rosenberg, R. and Loo, L.O. 1988. Marine eutrophication induced oxygen deficiency: effects on soft bottom fauna, western Sweden. Ophelia 29: 213–225.
Rutgers van der Loeff, M.M. et al. 1984. The asphyxiation technique: an approach to distinguishing between molecular diffusion and biologically mediated transport at the sediment-water interface. Limnology and Oceanography 29: 675–686.
Rysgaard, S., Christensen, P.B. and Nielsen, L.P. 1995. Seasonal variation in nitrification and denitrification in estuarine sediment colonized by benthic microalgae and bioturbating infauna. Marine Ecology Progress Series 126: 111–121.
Sasaki, K. 1989. Material circulation in intertidal flat. Bulletin of Coastal Oceanography 26: 172–190 (in Japanese).
Sundbäck, K., Enoksson, V., Granneli, W. and Petersson, K. 1991. Influence of sublittoral microphytobenthos on the oxygen and nutrient flux between sediment and water: a laboratory continuous-flow study. Marine Ecology Progress Series 74: 263–279.
Sweerts, J.P.R.A., Kelly, C.A., Rudd, J.W.M., Hesslein, R. and Cappenberg, T.E. 1991. Similarity of whole-sediment molecular diffusion coefficients in freshwater sediments of low and high porosity. Limnology and Oceanography 36: 335–342.
Varela, M. and Penas, E. 1985. Primary production of benthic microalgae in an intertidal sand flat of the Ria de Arosa, NWSpain. Marine Ecology Progress Series 25: 111–119.
Williams, P.J.L., Raine, R.C.T. and Bryan, J.R. 1979. Agreement between the C-14 and oxygen methods of measuring phytoplankton production reassessment of the photosynthetic quotient. Oceanology Acta 2: 411–416.