Bealey, W.J.; Roberts, E.M.

Interest features and linked critical load/level values for UK protected sites

This dataset contains the critical load and level values for designated habitats and species (where there is an appropriate match) at protected sites across the UK. The data is available for designated interest features for the following designations:
(i) Special Areas of Conservation (SAC)
(ii) Special Protection Areas (SPA)
(iii) Sites of Special Scientific Interest (SSSI) - England only.

Critical loads and levels are set under the auspices of the United Nations Economic Commission for Europe (UNECE) Convention on Long-Range Transboundary Air Pollution.

For nutrient nitrogen critical loads are based on empirical evidence, mainly observations from experiments and targeted gradient studies. These empirical critical loads are assigned to habitat classes of the European Nature Information System (EUNIS) to enable consistency of habitat terminology and understanding across Europe. In order the assign the relevant critical load to Annex I features, SSSI habitat features, or habitats of Annex II/SPA features, habitat correspondence tables are used to determine the relationship between the EUNIS classes for which nitrogen critical loads are set and the interest features.

Critical loads of acidity are based on soil and habitat types. They are set for six Broad Habitats; acid grassland, calcareous grassland, dwarf shrub heath, bogs, montane, unmanaged coniferous and broadleaved woodland.

Critical Levels for air pollutants are not habitat specific and have been set to cover broad vegetation types (e.g. forest arable, semi-natural), often with critical values set for sensitive lichens and bryophytes. They have been derived from experiments and observation that show varied effects on vegetation including visible injury symptoms of exposure and species composition changes in semi-natural vegetation.

Publication date: 2017-08-18

Get the data

Download data

Supporting documentation

Format of the dataset : Comma-separated values (CSV)

Access and use conditions

This resource is made available under the terms of the Open Government Licence

You must cite: Bealey, W.J.; Roberts, E.M. (2017). Interest features and linked critical load/level values for UK protected sites. NERC Environmental Information Data Centre. https://doi.org/10.5285/0c04050d-ed79-4864-a164-5eb25f8c6ebd

 

© NERC (Centre for Ecology & Hydrology), Natural Resources Wales, Environment Agency, the Northern Ireland Environment Agency, Natural England, the Joint Nature Conservation Committee (JNCC), Scotland and Northern Ireland Forum for Environmental Research (SNIFFER), the Scottish Environment Protection Agency (SEPA), Scottish Natural Heritage (SNH)

no limitations

Where/When

Study area

Supplemental information

Other useful information regarding this dataset:

Manual on Methodologies and Criteria for Modelling and Mapping Critical Loads and Levels and Air Pollution Effects, Risks and Trends

Quality

Lineage
Critical loads and levels have been applied to interest features across the designated network (SAC, SPA, and SSSI for England only) where a suitable match can be made. Critical load and level values are set out in the 'Manual on methodologies and criteria for Modelling and Mapping Critical Loads & Levels and Air Pollution Effects, Risks and Trends (CLRTAP, 2004 to 2016).

Matching relevant critical loads and levels for interest features (habitats) have been made using the European Nature Information System (EUNIS) classification and broad habitats under the Biodiversity Action Plan (BAP).

Empirical critical loads for nutrient nitrogen are assigned to a habitat using habitat correspondence tables to determine the relationship between the EUNIS classes for which nitrogen critical loads are set and the interest features. Justifications were provided for each match between an interest feature and its relevant critical load.

Critical loads of acidity are based on soil and habitat types and were based on six Broad Habitats; acid grassland, calcareous grassland, dwarf shrub heath, bogs, montane, unmanaged coniferous and broadleaved woodland (UK Biodiversity Action Plan, 1994).

For species relevant critical loads were applied to the specie's habitat and not the species itself. For example, for SPA bird features an assessment was made on the sensitivity of the habitat and how that would that affect the viability of the breeding, feeding or roosting of that species.

Critical level values are not habitat specific, but have been set to cover broad vegetation types (e.g. forest arable, semi-natural), often with critical values set for sensitive lichens and bryophytes as in the case of ammonia. Linkages were made between habitat and species where possible to provide site relevant critical levels for ammonia, nitrogen dioxide, and sulphur dioxide.

This work falls under the Air Pollution Information System (APIS) and is jointly funded between the Centre for Ecology and Hydrology and the UK pollution and conservation agencies including Natural Resources Wales (NRW), the Environment Agency, Northern Ireland Environment Agency, Natural England, the Joint Nature Conservation Committee (JNCC), Scotland and Northern Ireland Forum for Environmental Research (SNIFFER), the Scottish Environment Protection Agency (SEPA), and Scottish Natural Heritage (SNH).

Authors

Bealey, W.J.
Centre for Ecology & Hydrology
Roberts, E.M.
Centre for Ecology & Hydrology

Other contacts

Custodian
Environmental Information Data Centre
Publisher
NERC Environmental Information Data Centre
Point Of Contact
Bealey, W.J.
Centre for Ecology & Hydrology

Keywords

Topic categories
Environment
Other keywords
critical loads
critical levels
natura 2000
nitrogen deposition
acid deposition
ammonia
nitrogen dioxide
sulphur dioxide
CEH Topic
Biosphere-atmosphere interactions
INSPIRE Theme
Protected Sites

Dataset identifiers

https://catalogue.ceh.ac.uk/id/0c04050d-ed79-4864-a164-5eb25f8c6ebd
doi:10.5285/0c04050d-ed79-4864-a164-5eb25f8c6ebd

Metadata

Information maintained by
Centre for Ecology & Hydrology
Last updated
2018-06-11T15:15:27