Within-System Element Cycles, Input-Output Budgets, and Nutrient Limitation
Widely used conceptual models for controls on nutrient cycling and input-outputs budgets of forest ecosystems suggest that: (1) nutrient losses from ecosystems originate in the available nutrient pool in soil; (2) nutrients that limit plant production are retained tightly within those systems; (3) this retention leads to accumulation of the limiting nutrient(s), eventually to the point at which it no longer limits production; and (4) losses of nutrient(s) thereafter should reflect rates of nutrient input, rather than biotic demand In this chapter, we explore mechanisms that could constrain the accumulation of a limiting nutrient, and therefore could allow nutrient limitation to persist indefinitely. Possible mechanisms include episodic disturbance-related nutrient losses, closed element cycles, and losses of nutrients from sources other than the available inorganic pool of nutrients in soil. For the last mechanism, both a simple and a more complex model are used to show that losses of dissolved organic forms of a nutrient could constrain nutrient accumulation and permit nutrient limitation to persist indefintely. Emissions of nitrogen (N) trace gases produced during nitrification could have a similar effect. To the extent that losses of nutrients by these and related pathways are important, anthropogenic inputs of nutrients (particularly N) could alter forest ecosystems substantially, to an extent greater than standard conceptual models would allow.
KeywordsBiomass Phosphorus Dioxide Dust Europe
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- Berendse, F. 1993. Ecosystem stability, competition, and nutrient cycling. Pages 409–431 in E.-D. Schulze, and H.A. Mooney eds.Biodiversity and Ecosystem Function. Springer-Verlag, Berlin, Germany. (and p. 435)Google Scholar
- Cochran, M.F., and R.A. Berner. 1997. Promotion of chemical weathering by higher plants: field observations on Hawaiian basalts.Chemical Geology132:7185.Google Scholar
- Currie, W.S., J.D. Aber, W.H. McDowell, R.D. Boone, and A.H. Magill. 1996. Vertical transport of dissolved organic C and N under long-term N amendments in pine and hardwood forests.Biogeochemistry35:471–505.Google Scholar
- Firestone, M.K., and E.A. Davidson. 1989. Microbiological basis of NO and N20 production and consumption in soil. Pages 7–21 in M.O. Andreae and D.S. Schimel, eds.Exchange of trace gases between terrestrial ecosystems and the atmosphere.John Wiley & Sons, London.Google Scholar
- Hedin, L.O., and E. Hetherington. 1996. Atmospheric and geologic constraints on the biogeochemistry of North and South American temperate rain forests. Pages 57–74 in R.G. Lawford, P.B. Alaback, and E. Fuentes, eds.High-Latitude Forests and Associated Ecosystems on the West Coast of the Americas.Springer-Verlag, New York.CrossRefGoogle Scholar
- Kennedy, M.J., O.A. Chadwick, P.M. Vitousek, L.A. Derry, and D. Hendricks. Replacement of weathering with atmospheric sources of base cations during ecosystem development, Hawaiian Islands.Geologyin press.Google Scholar
- Metherell, A.K., L.A. Harding, C.V. Cole, and W.J. Parton. 1993. CENTURY soil organic matter model environment: technical documentation.Great Plains System Research Unit Technical Report 4USDA-ARS, Fort Collins, CO.Google Scholar
- Pickett, S.T.A., and P.S. White. eds. 1985.The ecology of natural disturbance and patch dynamics.Academic Press, New York.Google Scholar
- Redfield, A.C. 1958. The biological control of chemical factors in the environment.American Scientist46:205–221.Google Scholar
- Scholes, R.J. 1993. Nutrient cycling in semi-arid grasslands and savannas: its influence on pattern, productivity and stability.Proceedings of the XVII International Grassland Congress1331–1334.Google Scholar
- Swap, R., M. Garstang, S. Greco, R. Talbot, and P. Kallbert. 1992. Saharan dust in the Amazon Basin.Tellus44:133–149.Google Scholar
- Vitousek, P.M., O.A. Chadwick, T. Crews, J. Fownes, D. Hendricks, and D. Herbert. 1997 Soil and ecosystem development across the Hawaiian Islands.GSA Today7(9):1–8Google Scholar