Acidic Precipitation in Ontario Study / L'étude sur les précipitations acides en Ontario
The Acidic Precipitation in Ontario Study (A.P.I.O.S.) was established in 1979 by the Ontario Ministry of the Environment to protect the environment from the detrimental effects of acidic deposition and determine the effects of acidic deposition on terrestrial ecosystems.
L'étude sur les précipitations acides en Ontario (A.P.I.O.S.) a été établie en 1979 par le ministère de l'Environnement de l'Ontario pour protéger l'environnement contre les effets néfastes des dépôts acideset pour déterminer les effets des dépôts acides sur les écosystèmes terrestres.
The effect of acid inputs on the environment depends on the quantity and acidity of atmospheric inputs, and the buffering capacity of the terrestrial and aquatic ecosystems. The effect of acidic precipitation on soil is potentially significant because the soil is the reservoir of plant nutrients and the source of much of the water for aquatic systems. Changes in the soil's chemistry may therefore be reflected in both the terrestrial and aquatic environments. Information on the effects of acidic precipitation on soils is available from effects near point sources of pollution, from experimentation with simulated rain solutions, from natural changes observed in soil over time, and from models and soil forming theories. Anticipated effects of soil acidification include: reduced pH, leaching of basic cations (such as magnesium and calcium) and other exchangeable plant nutrients, reduction in base saturation and cation-exchange capacity, mobilization of soil-bound metals such as aluminum, and changes in biological activity such as decreased nitrification and soil respiration.
The principal objective of the baseline program is to establish a uniform data base for soils across the province. This data base 1) provides current data to identify future trends, 2) enables the development of laboratory experiments which define soil sensitivity criteria to acidic precipitation, and 3) provides information required for sensitivity mapping of soils throughout Ontario.
L'effet des apports acides sur l'environnement dépend de la quantité et de l'acidité des apports atmosphériques et de la capacité tampon des écosystèmes terrestres et aquatiques. L'effet des précipitations acides sur le sol est potentiellement important car le sol est le réservoir de nutriments des plantes et la source d'une grande partie de l'eau pour les systèmes aquatiques. Les changements dans la chimie du sol peuvent donc se refléter à la fois dans les environnements terrestres et aquatiques. Des informations sur les effets des précipitations acides sur les sols sont disponibles à partir des effets à proximité de sources ponctuelles de pollution, de l'expérimentation de solutions de pluie simulées, des changements naturels observés dans le sol au fil du temps, et de modèles et de théories de formation du sol. Les effets anticipés de l'acidification du sol comprennent: pH réduit, lessivage des cations basiques (tels que le magnésium et le calcium) et d'autres nutriments végétaux échangeables, réduction de la saturation en bases et de la capacité d'échange de cations, mobilisation de métaux liés au sol tels que l'aluminium et changements dans activité biologique telle que diminution de la nitrification et respiration du sol.
Le principal objectif du programme de référence est d'établir une base de données uniforme pour les sols de la province. Cette base de données 1) fournit des données actuelles pour identifier les tendances futures, 2) permet le développement d'expériences de laboratoire qui définissent les critères de sensibilité du sol aux précipitations acides, et 3) fournit les informations nécessaires à la cartographie de la sensibilité des sols à travers l'Ontario.
Additional Documentation
- DataDescription_APIOS (docx) - Data description document for the APIOS dataset | Document avec description des données pour le projet APIOS (170KB)
- APIOS_Sites (csv) - Site information collected at the APIOS sampling locations | Informations au niveau du site pour les sites d'échantillonnages du projet APIOS (69 KB)
- APIOS_HorizonsAll (csv) - Raw analytical data for APIOS sample sites | Données analytiques brutes pour les sites d'échantillonnages du projet APIOS (319 KB)
- APIOS_HorizonAverages (csv) - Analytical data averaged by soil horizon for APIOS sample sites, since horizons were often sampled in duplicate | Moyenne des données analytiques pour les sites d'échantillonnages du projet APIOS puisque les horizons ont souvent été échantillonnées en double (185 KB)
- APIOS Methods Manual - Report describing the sampling and analytical methods for the project | Rapport qui décrit les méthodes d'échantillonages et les analyses de laboratoires pour le projet. (1.0 MB)
- APIOS002_85_OntarioSoilBaselineSurvey_Vol1 - Report (1985) providing a description of the APIOS program, including objectives, overview of sampling methods, and introduction to soil formation and distribution across Ontario | Rapport (1985) qui décrit le programme APIOS, y inclus les méthodes d'échantillonnages, une introduction au développement et à la distribution des sols en Ontario. (1.0 MB).
- APIOS002_85_OntarioSoilBaselineSurvey_Vol2 - Report (1985) providing analytical data collected for southern Ontario | Rapport (1985) qui présente les données analytiques provenant du sud Ontarien. (46 MB).
- APIOS002_85_OntarioSoilBaselineSurvey_Vol3 - Report (1985) providing analytical data collected for northern Ontario | Rapport (1985) qui présente les données analytiques provenant du nord Ontarien. (1.3 MB).
- APIOS008_83_OntarioSoilBaselineSurvey_Vol1 - Report (1983) providing a description of the APIOS program, including objectives, overview of sampling methods, and introduction to soil formation and distribution across Ontario | Rapport (1983) qui décrit le programme APIOS, y inclus les méthodes d'échantillonnages, une introduction au développement et à la distribution des sols en Ontario. (500 KB).
- APIOS008_83_OntarioSoilBaselineSurvey_Vol2 - Report (1983) providing analytical data collected for southern Ontario | Rapport (1983) qui présente les données analytiques provenant du sud Ontarien. (51 MB).
- APIOS008_83_OntarioSoilBaselineSurvey_Vol3 - Report (1983) providing analytical data collected for northern Ontario | Rapport (1985) qui présente les données analytiques provenant du nord Ontarien. (23 MB).
Maintenance and Update Frequency
Complete
Contact
Daniel Saurette, [email protected]
Datasets available for download
This dataset has no data
Additional Info
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| Last Updated | September 18, 2026, 06:33 (UTC) |
| Created | March 24, 2026, 21:48 (UTC) |
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Domain / Topic
Domain or topic of the dataset being cataloged.
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Title
Title for the Dataset.
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Acidic Precipitation in Ontario Study / L'étude sur les précipitations acides en Ontario |
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Description
A description of the dataset.
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The Acidic Precipitation in Ontario Study (A.P.I.O.S.) was established in 1979 by the Ontario Ministry of the Environment to protect the environment from the detrimental effects of acidic deposition and determine the effects of acidic deposition on terrestrial ecosystems. L'étude sur les précipitations acides en Ontario (A.P.I.O.S.) a été établie en 1979 par le ministère de l'Environnement de l'Ontario pour protéger l'environnement contre les effets néfastes des dépôts acideset pour déterminer les effets des dépôts acides sur les écosystèmes terrestres.
The effect of acid inputs on the environment depends on the quantity and acidity of atmospheric inputs, and the buffering capacity of the terrestrial and aquatic ecosystems. The effect of acidic precipitation on soil is potentially significant because the soil is the reservoir of plant nutrients and the source of much of the water for aquatic systems. Changes in the soil's chemistry may therefore be reflected in both the terrestrial and aquatic environments. Information on the effects of acidic precipitation on soils is available from effects near point sources of pollution, from experimentation with simulated rain solutions, from natural changes observed in soil over time, and from models and soil forming theories. Anticipated effects of soil acidification include: reduced pH, leaching of basic cations (such as magnesium and calcium) and other exchangeable plant nutrients, reduction in base saturation and cation-exchange capacity, mobilization of soil-bound metals such as aluminum, and changes in biological activity such as decreased nitrification and soil respiration.
Maintenance and Update Frequency Complete Contact Daniel Saurette, [email protected] |
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Format (CSV, XLS, TXT, PDF, etc)
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Dataset Size
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276.05 |
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Metadata Identifier
Metadata identifier – can be used as the unique identifier for catalogue entry
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a9d3c2f21f824e9eba071124ec053875 |
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Published Date
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2020-05-20 |
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Access category
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public |
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License
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Open Government Licence – Ontario |
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Limits on use
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Location
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https://ontario-soils-geohub-ontarioca11.hub.arcgis.com/datasets/ontarioca11::acidic-precipitation-in-ontario-study-létude-sur-les-précipitations-acides-en-ontario |
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Data Service
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Owner
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OMAFRAGIS |
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Contact Point
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OMAFRA |
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Contact Point Email
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[email protected] |
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Publisher
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OMAFRA |
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Publisher Email
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Author
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OMAFRAGIS |
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Accessed At
Date the data and metadata was accessed.
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2025-12-09 |
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Identifier
Unique identifier for the dataset.
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a9d3c2f21f824e9eba071124ec053875 |
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Language
Language(s) of the dataset
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English |
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Link to dataset description
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https://ontario-soils-geohub-ontarioca11.hub.arcgis.com/datasets/ontarioca11::acidic-precipitation-in-ontario-study-létude-sur-les-précipitations-acides-en-ontario |
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Contains data about individuals
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Contains Indigenous Data
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Version
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None |
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Source
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None |
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Other versions
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Provenance Text
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Ontario Ministry of Agriculture, Food and Rural Affairs |
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Provenance URL
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GeoSpatial resolution (in regions)
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Indigenous Community Permission
Who holds the Indigenous Community Permission. Who to contact regarding access to a dataset that has data about Indigenous communities.
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Community Permission
Community permission (who gave permission).
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The Indigenous communities the dataset is about
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Metric for data quality
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