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Geography Research Seminar: Dr. Daniel Schillereff (King's College London), Exploring patterns and drivers of macronutrient stoichiometry in ombrotrophic peatlands

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Dates:9 November 2016
Times:16:00 - 17:30
What is it:Seminar
Organiser:School of Environment, Education and Development
Who is it for:University staff, Adults, Current University students
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  • In category "Seminar"
  • In group "(SEED) Geography"
  • By School of Environment, Education and Development

Decades of research here in the UK and abroad has confirmed that ombrotrophic peatlands across northern latitudes represent a globally-important store for carbon ©, nitrogen (N) and phosphorus (P) through the Holocene. That the supply of elements integral to biogeochemical functioning is largely controlled by external inputs is well-known but there is a striking dearth of long-term C, N and P stoichiometric data from ombrotrophic peatlands. As a result, some important questions surrounding the interactions between and controls on macronutrient cycling and accumulation remain unanswered. This precludes the production of long-term macronutrient inventories and introduces uncertainties into models of the global carbon cycle, for example. In this seminar I will present results of some hypothesis testing, adapting the following structure: (i) Preliminary estimates of millennial-scale macronutrient concentrations and accumulation rates in UK ombrotrophic peats and a global comparison; (ii) That N and P concentrations in peat are strongly associated and P + MAP explains a substantial portion of variance in N; (iii) That surface N and P enrichment peat is a distinctive feature of global peatlands that remains unconvincingly explained; (iv) As recently shown for lakes, geochemical data hint at an anthropogenic alteration to atmospheric supply of N and P sourced from, for example, industrial aerosols and P-enriched dust. As P and N fixation influence rates of C fixation, such a mechanism would have major implications for long-term carbon accumulation; (v) On-going and future plans to test this hypothesis more rigorously.

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