Increased nitrogen supply: effects on phosphorus and implications for ecosystems
08/3/19, 13:30 at Room 3631 (6th floor of building 3 of the Faculty of Sciences)
Nitrogen (N) supply to ecosystems has increased in recent history, due to deliberate and accidental introductions. A recent analysis (Elser et al. 2007) has shown that phosphorus (P) can be equally important to the fate of ecosystems. I introduce an analytically tractable model of N and P, which couples these elements in plant biomass and that takes into account their major forms within, and fluxes within, in to and out of, ecosystems. I ask how does increasing N supply impact upon the P cycle, assuming its main impact is to increase plant growth. I show that results at equilibrium depend on the form of nutrient loss and on supply pathways of P. I discuss how supply pathways may be further influenced by N addition potentially changing the conclusions reached. I then present recent work that applies my model to methods of P removal from ecosystems to aid in the restoration of grassland biodiversity.
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