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The Expert Panel on Nitrogen Budgets (EPNB)
Berlin, September 28, 2012
Wilfried Winiwarter, Albert Bleeker (co-chairs)
Take-home messages
• “Guidance Document on National Nitrogen Budgets” has been adopted by WGSR and will be forwarded to EB-31 as an official document (to demonstrate and to report voluntarily under revised Gothenburg protocol).
• Your help needed: Guidance document defines nitrogen pools (and sub-pools) to be derived, according to specific guidance still to be written.
• Your help needed: Extending guidance also to farm-level budgets.
Nitrogen budgets
• “Reactive Nitrogen”, Nr, is being conserved and transferred through different environmental pools (“N cascade”).
• Considerable information is available from different sources on nitrogen concentrations in pools and nitrogen flows.
• Mass conservation considerations allow validation of system understanding in models.
Examples
• Germany
• Switzerland
• UK, France, Netherlands, Austria, …
• European Union
Leip et al., 2011
Collaboration
• OECD “key environmental indicator”
• EUROSTAT – Gross Nutrient Balances– Fertilizer Statistics & Agro Environmental Indicators
• Memorandum of understanding between UN-ECE and Eurostat has been drafted