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Soil carbon may be maintained under grazing in a St Lawrence Estuary tidal marsh

Published online by Cambridge University Press:  26 March 2010

O.T. YU  and
G.L. CHMURA
O.T. YU
Affiliation:
Global Environmental and Climate Change Centre and Department of Geography, McGill University, 805 Sherbrooke Street West, Montreal, Québec, H3A 2K6Canada Department of Biological Sciences, University of Alberta, CW405 Biological Sciences Building, Edmonton, Alberta, T6G 2E9Canada
G.L. CHMURA*
Affiliation:
Global Environmental and Climate Change Centre and Department of Geography, McGill University, 805 Sherbrooke Street West, Montreal, Québec, H3A 2K6Canada
*
*Correspondence: Dr Gail Chmura Tel: +1 514 398 4958 e-mail: gail.chmura@mcgill.ca
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Summary

Production of belowground organic matter is critical to sustainability of salt marshes. It plays a role in vertical soil accretion, a process essential for salt marshes to maintain their relative elevation and persist as sea levels rise. This paper examines belowground production and soil carbon of a high-latitude saltmarsh in the St Lawrence Estuary (Québec, Canada), which had been subjected to six years of sheep grazing. In the seventh year, without sheep, organic matter production in grazed and ungrazed sections was assessed by examining harvests of plant litter, end-of-season standing crop, and the roots and rhizomes present in in-growth cores. Excepting salinity, porewater chemistry varied little. The grazed marsh had higher soil carbon density and belowground production, yet lower aboveground biomass. Grazing reduces plant litter and increases solar exposure, soil temperature (at this latitude, soil remained frozen until April) and evapotranspiration, thus raising soil salinity and nitrogen demand, the latter a driver of root production. Grazing may not be detrimental to soil carbon storage. Permitting certain types of grazing on restored salt marshes previously drained for agriculture would provide economic incentive to restore tidal flooding, because the natural carbon sink provided in the recovered marsh would make these lands eligible for carbon payments.

Keywords

carbon creditscarbon sequestrationecosystem servicesgrazingmarsh restorationroot productionsheep
Type
EC Perspectives
Information
Environmental Conservation , Volume 36 , Issue 4 , December 2009 , pp. 312 - 320
Copyright
Copyright © Foundation for Environmental Conservation 2010

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References

Ahearn, A. (2008) Carbon cowboys. Scientific American Earth 3.0: 52–57.CrossRefGoogle Scholar
Bakker, J.P. (1985) The impact of grazing on plant communities, plant populations and soil conditions on salt marshes. Vegetatio 62: 391–398.CrossRefGoogle Scholar
Bakker, J.P. & DeVries, Y. (1992) Germination and early establishment of lower salt-marsh species in grazed and mown salt marsh. Journal of Vegetation Science 3: 247–252.CrossRefGoogle Scholar
Bakker, J.P., DeLeeuw, J., Dijkema, K.S., Leendertse, P., Prins, H.H.T. & Rozema, J. (1993) Salt marshes along the coast of The Netherlands. Hydrobiologia 265: 73–95.CrossRefGoogle Scholar
Barbier, E.B., Koch, E.W., Silliman, B.R., Hacker, S.R., Wolanski, E., Primavera, J., Granek, E.F., Polasky, S., Aswani, S., Cramer, L.A., Stoms, D.M., Kennedy, C.J., Bael, D., Kappel, C.V., Perillo, G.M.E. & Reed, D.J. (2008) Coastal ecosystem–based management with nonlinear ecological functions and values. Science 319: 321–323.CrossRefGoogle ScholarPubMed
Bazely, D.R. & Jefferies, R.L. (1986) Changes in the composition and standing crop of salt-marsh communities in response to the removal of a grazer. Journal of Ecology 74: 693–706.CrossRefGoogle Scholar
Bernhardt, K.-G. & Koch, M. (2003) Restoration of a salt marsh system: temporal change of plant species diversity and composition. Basic Applied Ecology 4: 441–451.CrossRefGoogle Scholar
Bertness, M.D., Gough, L. & Shumway, S.W. (1992) Salt tolerances and the distribution of fugitive salt marsh plants. Ecology 73: 1842–1851.CrossRefGoogle Scholar
Bindoff, N.L., Willebrand, J., Artale, V., Cazenave, A., Gregory, J., Gulev, S., Hanawa, K., Le Quéré, C., Levitus, S., Nojiri, Y., Shum, C.K., Talley, L.D. & Unnikrishnan, A. (2007) Observations: oceanic climate change and sea level. In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, ed. Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K.B., Tignor, M. & Miller, H.L.. Cambridge, UK and New York, NY, USA: Cambridge University Press.Google Scholar
Bos, D., Loonen, M.J.J.E., Stock, M., Hofeditz, F., Van der Graaf, A.J. & Bakker, J.P. (2005) Utilisation of Wadden Sea salt marshes by geese in relation to livestock grazing. Journal for Nature Conservation 13: 1–15.CrossRefGoogle Scholar
Bouchard, V., Tessier, M, Digaire, F., Vivier, J.-P., Valery, L., Gloaguen, J.-C. & Lefeuvre, J.-C. (2003) Sheep grazing as management tool in western European saltmarshes. Comptes Rendus Biologies 326: S148–S157.CrossRefGoogle ScholarPubMed
Bridgham, S.D., Megonigal, J.P., Keller, J.K., Bliss, N.B. & Trettin, C. (2006) The carbon balance of North American wetlands. Wetlands 26: 889–916.CrossRefGoogle Scholar
Canadian Hydrographic Service (2007) Canadian Tide and Current Tables. Volume 3: St. Lawrence and Saguenay Rivers. Sidney, BC, Canada: Fisheries and Oceans Canada.Google Scholar
Cargill, S.M. & Jefferies, R.L. (1984) The effects of grazing by lesser snow geese on the vegetation of a sub-Arctic salt marsh. Journal of Applied Ecology 21: 669–686.CrossRefGoogle Scholar
Chmura, G.L. & Hung, G.A. (2004) Controls on salt marsh accretion: a test in salt marshes of eastern Canada. Estuaries 27: 70–81.CrossRefGoogle Scholar
Chmura, G.L., Anisfeld, S.C., Cahoon, D.R. & Lynch, J.C. (2003) Global carbon sequestration in tidal, saline wetland soils. Global Biogeochemical Cycles 17: 1–12.CrossRefGoogle Scholar
Connor, R.F., Chmura, G.L. & Beecher, C.B. (2001) Carbon accumulation in Bay of Fundy salt marshes: implications for restoration of reclaimed marshes. Global Biogeochemical Cycles 15: 943–954.CrossRefGoogle Scholar
Craft, C.B., Seneca, E.D. & Broome, S.W. (1991) Loss on ignition and Kjeldahl digestion for estimating organic carbon and total nitrogen in estuarine marsh soils: calibration with dry combustion. Estuaries 14: 175–179.CrossRefGoogle Scholar
Crain, C.M. (2007) Shifting nutrient limitation and eutrophication effects in marsh vegetation across estuarine salinity gradients. Estuaries and Coasts 30: 26–34.CrossRefGoogle Scholar
DeLaune, R.D., Patrick, W.H. & van Breemen, N. (1990) Processes governing marsh formation in a rapidly subsiding coastal environment. Catena 17: 277–288.CrossRefGoogle Scholar
Environment Canada (1985) Wetlands of the St Lawrence River region: 1950–1978. Working paper No. 45. Land Use Monitoring Division, Environment Canada, Ottawa, Canada: 45 pp.Google Scholar
Environment Canada (2004) Canadian climate normals 1971–2000. Trois Pistoles [www document]. URL http://www.climate.weatheroffice.ec.gc.ca/climate_normals/results_e.htmlGoogle Scholar
Environment Canada (2007) Daily data report for Rivère du Loup for June, July, August, September 2007 [www document]. URL http://www.climate.weatheroffice.ec.gc.ca/climateData/dailydata_e.htmlGoogle Scholar
Ford, M.A. & Grace, J.B. (1998) Effects of vertebrate herbivores on soil processes, plant biomass, litter accumulation and soil elevation changes in a coastal marsh. Journal of Ecology 86: 974–982.CrossRefGoogle Scholar
Gauthier, B. (1982) L’étagement des plantes vasculaires en milieu saumâtre, estuaire du Saint-Laurent. Naturaliste canadien 109: 189–203.Google Scholar
Gough, L. & Grace, J.B. (1998) Herbivore effects on plant species density at varying productivity levels. Ecology 79: 1586–1594.CrossRefGoogle Scholar
Handa, I.T., Harmsen, R. & Jefferies, R.L. (2002) Patterns of vegetation change and the recovery potential of degraded areas in a coastal marsh system of the Hudson Bay lowlands. Journal of Ecology 90: 86–99.CrossRefGoogle Scholar
Hatvany, M. (2003) Marshlands: Four Centuries of Environmental Change in the Shores of the St Lawrence. Sainte-Foy, QC, Canada: Les Presses de l'Université Laval.Google Scholar
Iacobelli, A. & Jefferies, R.L. (1991) Inverse salinity gradients in coastal marshes and the death of stands of Salix: the effects of grubbing by geese. Journal of Ecology 79: 61–73.CrossRefGoogle Scholar
Jefferies, R.L., Rockwell, R.F. & Abraham, K.E. (2004) Agricultural food subsidies, migratory connectivity and large-scale disturbance in arctic coastal systems: a case study. Integrative and Comparative Biology 44:130–139.CrossRefGoogle ScholarPubMed
Jefferies, R.L., Jano, A.P. & Abraham, K.F. (2006) A biotic agent promotes large-scale catastrophic change in the coastal marshes of Hudson Bay. Journal of Ecology 94: 234–242.CrossRefGoogle Scholar
Jensen, A. (1985) The effect of cattle and sheep grazing on salt-marsh vegetation at Skallingen, Denmark. Vegetatio 60: 37–48.CrossRefGoogle Scholar
Keddy, P.A. (2000) Wetland Ecology. Cambridge, UK: Cambridge University Press.Google Scholar
Keppler, F., Hamilton, J.T., Brab, M. & Rockmann, T. (2006) Methane emissions from terrestrial plants under aerobic conditions. Nature 439: 187–191.CrossRefGoogle ScholarPubMed
Kiehl, K., Eischeid, I., Gettner, S. & Walter, J. (1996) Impact of different sheep grazing intensities on salt marsh vegetation in northern Germany. Journal of Vegetation Science 7: 99–106.CrossRefGoogle Scholar
Kuijper, D.P. & Bakker, J.P. (2005) Top-down control of small herbivores on salt-marsh vegetation along a productivity gradient. Ecology 86: 914–923.CrossRefGoogle Scholar
Létourneau, G. & Jean, M. (2005) Mapping the Wetlands of the St. Lawrence Using Remote Sensing (1990–1991). Science and Technical Report ST-232, Environment Canada, Science and Technology Branch, Ottawa, Canada: 99 pp.Google Scholar
Meyer, H., Fock, H., Haase, A., Reinke, H.D. & Tulowitzki, I. (1995) Structure of the invertebrate fauna in salt marshes of the Wadden Sea coast of Schleswig-Holstein influenced by sheep-grazing. Helgoländer meeresuntersuchungen 49: 563–589.CrossRefGoogle Scholar
Mitsch, W.J. & Gosselink, J.G. (2000) Wetlands. Third edition. New York, NY, USA: John Wiley and Sons, Inc.Google Scholar
Morris, J.T. & Jensen, A. (1998) The carbon balance of grazed and non-grazed Spartina anglica saltmarshes at Skallingen, Denmark. Journal of Ecology 86: 229–242.CrossRefGoogle Scholar
Nyman, J.A., Chabreck, R.H. & Kinler, N.W. (1993) Some effects of herbivory and 30 years of weir management on emergent vegetation in brackish marsh. Wetlands 13: 165–175.CrossRefGoogle Scholar
Nyman, J.A., Walters, R.J., Delaune, R.D. & Patrick, W.H. Jr (2006) Marsh vertical accretion via vegetative growth. Estuarine, Coastal and Shelf Science 69: 370–380.CrossRefGoogle Scholar
Parsons, T.R., Maita, Y. & Lalli, C.M. (1984) A Manual of Chemical and Biological Methods for Seawater Analysis. Oxford, UK: Pergamon Press.Google Scholar
Pehrsson, O. (1988) Effects of grazing and inundation on pasture quality and seed production in a salt marsh. Vegetatio 74: 113–124.CrossRefGoogle Scholar
Pennings, S.C. & Bertness, M.D. (2001) Salt marsh communities. In: Marine Community Ecology, ed. Bertness, M.D., Gaines, S.D. & Hay, M.E., pp. 289–316. Sunderland, MA, USA: Sinauer Associates, Inc.Google Scholar
Pezeshki, S.R. & DeLaune, R.D. (1991) Ecophenic variations in wiregrass (Spartina patens). Journal of Aquatic Plant Management 29: 99–102.Google Scholar
Price, J.S. & Woo, M.K. (1988) Origin of salt in coastal marshes of Hudson and James bays. Canadian Journal of Earth Science 25: 145–147.CrossRefGoogle Scholar
Ranwell, D.S. (1961) Spartina salt marshes in southern England. I. The effects of sheep grazing at the upper limits of Spartina marsh in Bridgewater Bay. Journal of Ecology 49: 325–340.CrossRefGoogle Scholar
Reader, J. & Craft, C.B. (1999) A comparison of wetland structure and function on grazed and ungrazed salt marshes. The Journal of the Elisha Mitchell Scientific Society 115: 236–249.Google Scholar
Reed, A. & Moisan, G. (1971) The Spartina tidal marshes of the St Lawrence estuary and their importance to aquatic birds. Naturaliste Canadien 98: 905–922.Google Scholar
Reimold, R.J., Linthurst, R.A. & Wolf, P.L. (1975) Effects of grazing on a salt marsh. Biological Conservation 8: 105–125.CrossRefGoogle Scholar
Seliskar, D.M. (2003) The response of Ammophila breviligulata and Spartina patens (Poaceae) to grazing by feral horses on a dynamic mid-Atlantic barrier island. American Journal of Botany 90: 1038–1044.CrossRefGoogle ScholarPubMed
Silliman, B.R. & Bertness, M.D. (2002) A trophic cascade regulates salt marsh primary production. Proceedings of the National Academy of Sciences of the United States of America 99: 10500–10505.CrossRefGoogle ScholarPubMed
Sokal, R.R. & Rohlf, F.J. (1995) Biometry. Third edition. New York, NY: WH Freeman and Company.Google Scholar
Srivastava, D.S. & Jefferies, R.L. (1995) Mosaics of vegetation and soil salinity: a consequence of goose foraging in an arctic salt marsh. Canadian Journal of Botany 73: 75–83.CrossRefGoogle Scholar
Srivastava, D.S. & Jefferies, R.L. (1996) A positive feedback: herbivory, plant growth, salinity, and the desertification of an Arctic salt-marsh. Journal of Ecology 84: 31–42.CrossRefGoogle Scholar
Tabachnick, B.G. & Fidell, L.S. (2001) Using Multivariate Statistics. Sixth edition. Boston, MA, USA: Allyn and Bacon.Google Scholar
Tessier, M., Vivier, J.-P., Ouin, A., Gloaguen, J.-C. & Lefeuvre, J.-C. (2003) Vegetation dynamics and plant species interactions under grazed and ungrazed conditions in a western European salt marsh. Acta Oecologica 24: 103–111.CrossRefGoogle Scholar
Turner, M.G. (1987) Effects of grazing by feral horses, clipping, trampling, and burning on a Georgia salt marsh. Estuaries 10: 54–60.CrossRefGoogle Scholar
Turner, R.E. (1976) Geographic variations in salt marsh macrophyte production: a review. Contributions to Marine Science 20: 47–68.Google Scholar
Turner, R.E., Swenson, E.M. & Milan, C.S. (2001) Organic and inorganic contributions to vertical accretion in salt marsh sediments. In: Concepts and Controversies in Tidal Marsh Ecology, ed. Weinstein, M.P. & Kreeger, K., pp. 583–595. Dordrecht, the Netherlands: Kluwer Academic Publishers.Google Scholar
Underwood, A.J. (1997) Experiments in Ecology: Their Logical Design and Interpretation Using Analysis of Variance. Cambridge, UK: Cambridge University Press.Google Scholar