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dc.contributor.authorLatour JB
dc.contributor.authorReiling R
dc.date.accessioned2012-12-12T21:52:35Z
dc.date.available2012-12-12T21:52:35Z
dc.date.issued1992-10-31
dc.identifier711901007
dc.identifier.urihttp://hdl.handle.net/10029/261194
dc.description.abstractAbstract niet beschikbaar
dc.description.abstractIn this report a strategy for ecological standard setting is proposed for environmental variables in the field of acidification, eutrophication and desiccation, using a risk assessment. Risks at the species level and ecosystem level are specified. At the species level the risks are assessed on the base of the ecological amplitude of a species. The ecological amplitude describes the occurrence probability of a species as a function of environmental variables. Values of the environmental variable are assessed that correspond with a specified reduced occurrence probability. Reduced occurrence probability may be due to intoxication (too much) and limitation (too little). These values are quantified for each species as the uppervalue and lowervalue of the environmental variable that envisage 90% of the observations of a species (5% percentile and 95% percentile values). At the ecosystem level risks are specified as the concentration that protects a specified percentages of all species. In the dutch environmental policy for pollutants this percentages is set at 95%. The ecological standard is assessed by combining the risks at the species level and the ecosystem level. The number of species, for which the 5% and 95% percentiles are not exceeded, are plotted as a function of the environmental variable. From this relation the maximum environmental level can be assessed that protects 95% of all species. This strategy for standards setting is illustrated with a case study in the Province of South-Holland. Ecological standards are calculated for nitrogen load and changes in groundwaterlevel using data on 285 plant species. This report will be issued in english.
dc.description.sponsorshipDGM/GV
dc.format.extent30 p
dc.language.isonl
dc.relation.ispartofRIVM Rapport 711901007
dc.relation.urlhttp://www.rivm.nl/bibliotheek/rapporten/711901007.html
dc.subject12nl
dc.subjectecologienl
dc.subjectnormnl
dc.subjectnormstellingnl
dc.subjectrisiconl
dc.subjectvermestingnl
dc.subjectverzuringnl
dc.subjectverdrogingnl
dc.subjectbiogeografienl
dc.subjectgrenswaardenl
dc.subjectstikstofnl
dc.subjectgrondwaternl
dc.subjectwaterstandnl
dc.subject92-4nl
dc.subjectmovenl
dc.subjectecologyen
dc.subjectstandardsen
dc.subjectrisksen
dc.subjectover fertilizationen
dc.subjectacidificationen
dc.subjectdesiccationen
dc.subjectbiogeographyen
dc.subjectlimitsen
dc.subjectnitrogenen
dc.subjectgroundwateren
dc.subjectwater levelsen
dc.titleEcologische normen voor vermesting, verzuring en verdroging. Aanzet tot een risicobenaderingnl
dc.title.alternativeEcological standards in the field of eutrophication, acidification and desiccation. Use of a risk assessmenten
dc.typeReport
dc.date.updated2012-12-12T21:52:36Z
html.description.abstractAbstract niet beschikbaar
html.description.abstractIn this report a strategy for ecological standard setting is proposed for environmental variables in the field of acidification, eutrophication and desiccation, using a risk assessment. Risks at the species level and ecosystem level are specified. At the species level the risks are assessed on the base of the ecological amplitude of a species. The ecological amplitude describes the occurrence probability of a species as a function of environmental variables. Values of the environmental variable are assessed that correspond with a specified reduced occurrence probability. Reduced occurrence probability may be due to intoxication (too much) and limitation (too little). These values are quantified for each species as the uppervalue and lowervalue of the environmental variable that envisage 90% of the observations of a species (5% percentile and 95% percentile values). At the ecosystem level risks are specified as the concentration that protects a specified percentages of all species. In the dutch environmental policy for pollutants this percentages is set at 95%. The ecological standard is assessed by combining the risks at the species level and the ecosystem level. The number of species, for which the 5% and 95% percentiles are not exceeded, are plotted as a function of the environmental variable. From this relation the maximum environmental level can be assessed that protects 95% of all species. This strategy for standards setting is illustrated with a case study in the Province of South-Holland. Ecological standards are calculated for nitrogen load and changes in groundwaterlevel using data on 285 plant species. This report will be issued in english.


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