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Action Group D2: Nutrient cycling and critical loads

Action Group D2: Nutrient cycling and critical loads Pasi Rautio ICP Forests Expert panel on foliar analysis and litterfall Description:

Samuel
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Action Group D2: Nutrient cycling and critical loads

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  1. Action Group D2: Nutrient cycling and critical loads Pasi Rautio ICP Forests Expert panel on foliar analysis and litterfall /

  2. Description: This Action Group is a demonstration project to be carried out on a limited number of IM1 monitoring plots (209 plots). It aims at the refinement and development of monitoring methods in the field of nutrient cycling and critical loads. Data collection is included under Action Group D2, and the related coordination and evaluation is included in Action C1-Fol1-10(FI). /

  3. Methods employed: • This action will only be conducted on plots on which the full set of surveys from Action Group IM1 is carried out (exception: no passive samplers in countries of Northern Europe) In addition, surveys specifically conducted within this action: • Methods defined in ICP Forests Manual Chapter 11 “Litterfall” (mass and element concentrations) • Methods defined in ICP Forests Manual Chapter 3 “Soil solution” (chemical composition) • More intensive foliar surveys (all leaf age classes, estimation of foliage mass, leaf mass per area and leaf area index). Monitoring manuals for the new methods will be developed within Action C1-Fol1-10(FI) at the beginning of 2009 and will be implemented starting from the second half of 2009. • Nutrient budget of ground vegetation. Monitoring manuals for the new methods will be developed within Action C1-Fol1-10(FI) and will be implemented starting from the second half of 2009. /

  4. Expected results: • Plots equipped with related monitoring devices • Data on nutrient fluxes and deposition as a basis for the calculation of critical loads and as a basis for deriving information on nutrient fluxes through the soil: • loss of base cations • loss of nitrogen / nitrate flux to ground water • input/output balance of individual nutrients • Estimations of nutrient budgets in vegetation (content and output) • Estimations of critical loads on the plots • Estimation of critical load exceedances on the plots • Predictions on whether the critical loads will change if the vegetation on the plots changes /

  5. ICP Modelling and MappingCritical loads and levels approach For the purposes of ICP Modelling and Mapping, and as a basis for the commonly agreed methodology, the following definitions have been adopted: Critical load: a quantitative estimate of an exposure to one or more pollutants below which significant harmful effects on specified sensitive elements of the environment do not occur according to present knowledge. / Source: http://www.unece.org/env/lrtap/WorkingGroups/wge/definitions.htm

  6. Critical load: a quantitative estimate of an exposure to one or more pollutants below which significant harmful effects on specified sensitive elements of the environment do not occur according to present knowledge. For the user of this definition the following clarifications should constitute part of the definition: Exposure: means deposition experienced on an area basis e.g. eq m-2 yr-1; kg ha-1 yr-1. Pollutants: includes sulphur and nitrogen (NOY and NHX) compounds. Significant harmful effects: could be the consequence of short term or long term deposition. Several types of harmful effects may be defined including: - chemical changes in soils and waters which might cause direct or indirect effects on organisms - changes in individual organisms, in populations and ecosystems. Sensitive elements: can be part or whole of an ecosystem or of ecosystem development processes. Acid Neutralising Capacity (ANC): Ability of a solution to neutralise inputs of strong acid to a preselected equivalence. An important chemical parameter used in critical loads calculations. Biological Indicator: selected organism(s) or population sensitive to chemical effects resulting from changes in sulphur and nitrogen deposition. Critical chemical value: The highest value of a critical chemical parameter or combination of parameters (e.g., pH, Al/Ca ratio) that does not cause a significant harmful response in a biological indicator. / Source: http://www.unece.org/env/lrtap/WorkingGroups/wge/definitions.htm

  7. Link to ICP modelling and mapping • Are there parameters that ICP modelling and mapping needs but is not getting from ICP Forests at the moment? /

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  10. Thank you for your attention! /

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