Developments in deriving critical limits and modelling critical loads of nitrogen for terrestrial ecosystems in Europe
2007
This collaborative report of Alterra and the Coordination Center for Effects (MNP-CCE), in cooperation
with various participants of the International Cooperative programme on Modelling and
Mapping (ICP-MM) includes:
1. A summarizing overview of adverse nitrogen deposition effects on terrestrial ecosystems
in terms of impacts on plant species and faunal biodiversity, forest nutrient status in
relation to impacts on soil and solution chemistry and on ground water quality.
2. An overview of integrated dynamic biogeochemical models with plant species diversity
models, that allow the assessment of critical loads and target loads of nitrogen in view of
plant species diversity impacts.
3. A review of currently used critical limits for N concentrations in soil solution and
derivation of new critical limits, based on field (literature) data and integrated soil
vegetation models, that can be used in the computation of critical loads by steady state soil
models.
This updated knowledge of N effects, critcal N load methodologies (integrated models) and critical
N limits a can contribute to a more appropriate data submission on critical N loads by the National
Focal Centres to the CCE, specifically in view of biodiversity impacts, to be used for support of
the UNECE and EU air pollution policies.
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