Critical loads of acidity and nutrient nitrogen for UK habitats
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- Metadata Language
- English (en)
- Character set
- utf8
- Dataset Reference Date ()
- 2018-08-06
- Identifier
- doi: / 10.5285/299e2779-0787-46bb-9482-03ad474eae27
- Other citation details
- Hall, J. (2018). Critical loads of acidity and nutrient nitrogen for UK habitats. NERC Environmental Information Data Centre 10.5285/299e2779-0787-46bb-9482-03ad474eae27
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- © Crown copyright and database right
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- If you reuse this data, you should cite: Hall, J. (2018). Critical loads of acidity and nutrient nitrogen for UK habitats. NERC Environmental Information Data Centre https://doi.org/10.5285/299e2779-0787-46bb-9482-03ad474eae27
- Spatial representation type
- textTable
- Distance
- 1000 urn:ogc:def:uom:EPSG::9001
- Topic category
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- Environment
- Begin date
- 2004-01-01
- End date
- 2011-12-31
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- Quality Scope
- dataset
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- dataset
Report
- Dataset Reference Date ()
- 2010-12-08
- Statement
- The methods used to calculate UK critical loads are based on internationally agreed approaches and the best available national-scale data sets. Acidity critical loads for terrestrial habitats are based on the mineralogy and chemistry of the dominant soil type in each 1x1 km grid square (with the exception of the bog habitat which is assumed to be on peat), together with habitat-specific data. For woodland habitats simple mass balance equations, based on balancing the acidic inputs to, and outputs from a system, are used to derive a critical load that ensures the selected chemical criterion is not exceeded. Acidity critical loads are mapped for the following habitats: acid grassland, calcareous grassland, dwarf shrub heath, bog, montane, managed (productive) coniferous woodland, managed (productive) broadleaved woodland, and unmanaged woodland. Acidity critical loads for 1752 surface waters in acid-sensitive regions of the UK are calculated using the catchment-based First-order Acidity Balance (FAB) model. The acidity critical loads consist of three separate values for each habitat: * CLmaxS = maximum critical load of sulphur: the acidity critical load expressed in terms of sulphur only, when nitrogen deposition is zero * CLmaxN = maximum critical load of nitrogen: the acidity critical load expressed in terms of nitrogen only, when sulphur deposition is zero * CLminN = minimum critical load of nitrogen: representing the long term nitrogen removal processes in the soil (e.g. nitrogen uptake and immobilisation) and harvesting of vegetation. Critical loads of nutrient nitrogen for natural and semi-natural habitats, and unmanaged (non-productive) woodlands are empirically derived values based on observed changes in the structure or function of ecosystems. For managed (productive) woodlands a nitrogen mass balance approach is used to derive critical loads that will prevent an increase in the leaching of nitrogen compounds and ensure sustainable production. Nutrient nitrogen critical loads are mapped for the following habitats: acid grassland, calcareous grassland, dwarf shrub heath, bog, montane, managed (productive) coniferous woodland, managed (productive) broadleaved woodland, unmanaged Beech woodland, unmanaged acidophilous oak woodland, unmanaged Scots Pine woodland, other unmanaged woodland, dune grasslands, saltmarsh. A full description of the methods and data used to derive and calculate UK critical loads of acidity and nutrient nitrogen can be found in the 'Methods Report' (Hall et al, 2015). Hall, J., Curtis, C., Dore, T., Smith, R. 2015. Methods for the calculation of critical loads and their exceedances in the UK. Report to Defra, prepared under Contract AQ0826. http://www.cldm.ceh.ac.uk/sites/cldm.ceh.ac.uk/files/MethodsReport_Updated_July2015_WEB.pdf
Metadata
- File identifier
- 299e2779-0787-46bb-9482-03ad474eae27 XML
- Metadata Language
- English (en)
- Character set
- ISO/IEC 8859-1 (also known as Latin 1)
- Resource type
- dataset
- Hierarchy level name
- dataset
- Metadata Date
- 2024-02-08T17:35:05
- Metadata standard name
- UK GEMINI
- Metadata standard version
- 2.3