Abstract
Uptake of 15N labelled NH4NO3 by two Sphagnum mosses on a raised bog in north east Scotland was measured at different times of the year. In a field experiment, fortnightly additions of NH4NO3 at natural abundance, equivalent to 3 g N m-2 yr-1, were made over 14 months to cores of Sphagnum capillifolium occupying hummocks and S. recurvum colonizing hollows. Pre-harvested cores were treated with 15NH415NO3 two weeks before harvesting and 15N abundance determined for the total N in the moss, inorganic and dissolved organic N (DON) in the moss water and extractable inorganic, organic and microbial N in the underlying peat. The proportion of added 15N taken up by the mosses two weeks after each addition averaged 72% and ranged between 11 and 100%, tending to be least during October when the rising water table reached the surface, particularly for S. recurvum. A small proportion of the 15N was detected in the moss water as NH4+ (0.01%) and as DON (0.03%) and on occasions a large proportion remained unaccounted for. In waters from S. capillifolium, DON was proportional to the amount of inorganic N added, but this was not the case for S. recurvum. Little or no 15N was detected in the underlying peat partly because of the large size and variability of the NH4+, DON and microbial N pools.
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References
Aerts R, Wallén B & Malmer N (1992) Growth-limiting nutrients in Sphagnum-dominated bogs subject to low and high atmospheric nitrogen supply. J. Ecol. 80: 131–140
Baxter R, Emes MJ & Lee JA (1992) Effects of an experimentally applied increase in ammonium on growth and amino-acid metabolism of Sphagnum cuspidatum Ehrh. ex. Hoffm. from differently polluted areas. New Phytol. 120: 265–274
Bremner JM (1965) Inorganic forms of nitrogen. In: Black CA (Ed.) Methods of Soil Analysis, Part 2 (pp 1179–1206). American Society of Agronomy, Madison, Wisconsin, U.S.A.
Brookes PC, Landman A, Pruden G & Jenkinson DS (1985) Chloroform fumigation and the release of soil nitrogen: a rapid direct extraction method to measure microbial biomass nitrogen in soil. Soil Biol. Biochem. 17: 837–842
Crooke WM & Simpson WE (1971) Determination of ammonium in Kjeldahl digests of crops by an automated procedure. J. Sci. Fd Agric. 22: 9–10
Damman AWH (1988) Regulation of nitrogen removal and retention in Sphagnum bogs and other peatlands. Oikos 51: 291–305
Daniels RE & Eddy A (1985) Handbook of European Sphagna. Institute of Terrestrial Ecology, Natural Environment Research Council. Cambrian News, Aberystwyth, U.K.
Genstat 5 Committee (1993) Genstat 5 Release 3 Reference Manual. Oxford University Press, Oxford
Gerdol R (1991) Seasonal variations in the element concentrations in mire water and in Sphagnum mosses on an ombrotrophic bog in the southern Alps. Lindbergia 16: 44–50
Gilbert D, Amblard C, Bourdier G & Francez A-J (1998) The microbial loop at the surface of a peatland: structure, function and impact of nutrient input. Microb. Ecol. 35: 83–93
Grosvernier P, Matthey Y & Buttler A (1997) Growth potential of three Sphagnum species in relation to water table level and peat properties with implications for their restoration in cut-over bogs. J. Appl. Ecol. 34: 471–483
Hemmond HF (1983) The nitrogen budget of Thoreau's bog. Ecology 64: 99–109
Henriksen A & Selmer-Olsen AR (1970) Automatic methods for determining nitrate and nitrite in water and soil extracts. Analyst 95: 514–518
INDITE (1994) Impacts of Nitrogen Deposition in Terrestrial Ecosystems. Report of the United Kingdom Review Group on Impacts of Atmospheric Nitrogen. Department of the Environment, London 110 pp
Murphy J & Riley JP (1962) A modified single solution method for the determination of phosphate in natural waters. Anal. Chim. Acta 27: 31–36
Regina K, Nykänen H, Silvola J & Martikainen PJ (1996) Fluxes of nitrous oxide from boreal peatlands as affected by peatland type, water table level and nitrification capacity. Biogeochem. 35: 401–418
Rosswall T & Granhall U (1980) Nitrogen cycling in a subarctic ombrotrophic mire. In: Sonesson M (Ed.) Ecology of a Subarctic Mire. Ecological Bulletin (Stockholm) 30 (pp 209–234)
Silcock DJ & Williams BL (1995) The fate and effects of inorganic nitrogen inputs to raised bog vegetation. In: Jenkins A, Ferrier RC & Kirby C (Eds) Ecosystem Manipulation Experiments. Ecosystems Research Report 20 (pp 44–48). European Commission, Brussels
van Breemen N (1995) How Sphagnum bogs down other plants. Trends in Ecology and Evolution 10: 270–275
von Post L (1929) Sveriges Geologiska Undersøknings torvinventering och nogra av dess hittils vunna resultat. Svenska Mosskulturføreningens Tidskrift 36: 1–27
Williams BL, Buttler A, Grosvernier Ph, Francez A-J, Gilbert D, Ilomets M, Jauhiainen J, Matthey Y, Silcock DJ & Vasander H (1998) The fate of NH4NO3 added to Sphagnum magellanicum carpets at five European mire sites. Biogeochemistry (In Press)
Williams BL & Silcock DJ (1997) Nutrient and microbial changes in the peat profile beneath Sphagnum magellanicum in response to additions of ammonium nitrate. J. Appl. Ecol. 34: 961–970
Williams BL, Shand CA, Hill M, O'Hara C, Smith S & Young ME (1995) A procedure for the simultaneous oxidation of total soluble nitrogen and phosphorus in extracts of fresh and fumigated soils and litters. Commun. Soil Sci. Plant Anal. 26: 91–106
Williams BL & Sparling GP (1984) Extractable nitrogen and phosphorus in relation to microbial biomass in acid organic soils. Plant & Soil 76: 139–148
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Williams, B., Silcock, D. & Young, M. Seasonal dynamics of N in two Sphagnum moss species and the underlying peat treated with 15NH415NO3. Biogeochemistry 45, 285–302 (1999). https://doi.org/10.1023/A:1006134515648
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DOI: https://doi.org/10.1023/A:1006134515648