{"id":238,"date":"2019-06-11T14:49:25","date_gmt":"2019-06-11T14:49:25","guid":{"rendered":"https:\/\/opentextbc.ca\/physicalgeology2ed\/chapter\/5-5-the-soils-of-canada\/"},"modified":"2021-12-07T21:59:32","modified_gmt":"2021-12-07T21:59:32","slug":"5-5-the-soils-of-canada","status":"publish","type":"chapter","link":"https:\/\/opentextbc.ca\/physicalgeology2ed\/chapter\/5-5-the-soils-of-canada\/","title":{"raw":"5.5 The Soils of Canada","rendered":"5.5 The Soils of Canada"},"content":{"raw":"Up until the 1950s, the classification of soils in Canada was based on the system used in the United States. However, it was long recognized that the U.S .system did not apply well to many parts of Canada because of climate and environmental differences. The Canadian System of Soil Classification was first outlined in 1955 and has been refined and modified numerous times since then.\r\n\r\nThere are 10 orders of soil recognized in Canada. Each one is divided into groups, and then families, and then series, but we will only look at the orders, some of which are summarized in Table 5.2. The distribution of these types of soils (and a few others) in Canada is shown in Figure 5.5.1.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Table 5.2 The nature, origins and distributions of the more important soil orders in Canada<\/caption>\r\n
Order<\/th>\r\nType<\/th>\r\nBrief Description<\/th>\r\nEnvironment<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
Forest soils<\/td>\r\nPodsol<\/td>\r\nWell-developed A and B horizons<\/td>\r\nConiferous forests throughout Canada<\/td>\r\n<\/tr>\r\n
Luvisol<\/td>\r\nClay rich B horizon<\/td>\r\nNorthern prairies and central B.C., mostly on sedimentary rocks<\/td>\r\n<\/tr>\r\n
Brunisol<\/td>\r\nPoorly developed or immature soil, that does not have the well-defined horizons of podsol or luvisol<\/td>\r\nBoreal-forest soils in the discontinuous permafrost areas of central and western Canada, and also in southern B.C.<\/td>\r\n<\/tr>\r\n
Grassland soils<\/td>\r\nChernozem<\/td>\r\nHigh levels of organic matter and an A horizon at least 10 centimetres thick<\/td>\r\nSouthern prairies (and parts of B.C.\u2019s southern interior), in areas that experience water deficits during the summer<\/td>\r\n<\/tr>\r\n
Solonetzic<\/td>\r\nA clay-rich B horizon, commonly with a salt-bearing C horizon<\/td>\r\nSouthern prairies, in areas that experience water deficits during the summer<\/td>\r\n<\/tr>\r\n
Other important soils<\/td>\r\nOrganic<\/td>\r\nDominated by organic matter; mineral horizons are typically absent<\/td>\r\nWetland areas, especially along the western edge of Hudson Bay, and in the area between the prairies and the boreal forest<\/td>\r\n<\/tr>\r\n
Cryosol<\/td>\r\nPoorly developed soil, mostly C horizon<\/td>\r\nPermafrost areas of northern Canada<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nThere is an excellent website on Canadian soils, with videos describing the origins and characteristics of the soils, at: Soil Classification: Soil Orders of Canada<\/a>.\r\n\r\nAs we\u2019ve discussed, the processes of soil formation are dominated by the downward transportation of clays and certain elements dissolved in water, and the nature of those processes depends in large part on the climate. In Canada\u2019s predominantly cool and humid climate (which applies to most places other than the far north), [pb_glossary id=\"1429\"]podsolization[\/pb_glossary]<\/strong> is the norm. This involves downward transportation of hydrogen, iron, and aluminum (and other elements) from the upper part of the soil profile, and accumulation of clay, iron, and aluminum in the B horizon. Most of the [pb_glossary id=\"1430\"]podsols[\/pb_glossary]<\/strong>, <\/strong>[pb_glossary id=\"1431\"]luvisols[\/pb_glossary]<\/strong>, and [pb_glossary id=\"1433\"]brunisols[\/pb_glossary]<\/strong> of Canada form through various types of podsolization.<\/a>\r\n\r\n[caption id=\"attachment_237\" align=\"aligncenter\" width=\"750\"]\"\"<\/a> Figure 5.5.1 The soil order map of Canada. [Image Description]<\/a>[\/caption]In the grasslands of the dry southern parts of the prairie provinces and in some of the drier parts of southern B.C., dark brown organic-rich chernozem soils are dominant. In some parts of these areas, weak calcification takes place with leaching of calcium from the upper layers and accumulation of calcium in the B layer. Development of caliche layers is rare in Canada.\r\n\r\nOrganic soils form in areas with poor drainage (i.e., swamps) and a rich supply of organic matter. These soils have very little mineral matter.\r\n\r\nIn the permafrost regions of the north, where glacial retreat was most recent, the time available for soil formation has been short and the rate of soil formation is very slow. The soils are called cryosols (cryo<\/em> means \u201cice cold\u201d). Permafrost areas are also characterized by the churning of the soil by freeze-thaw processes, and as a result, development of soil horizons is very limited.\r\n
\r\n

Exercise 5.4 The soils of Canada<\/p>\r\n\r\n<\/header>\r\n

\r\n\r\nExamine Figure 5.5.1, which shows the distribution of soils in Canada. Briefly describe the distributions of the five soils types listed. For each one, explain its distribution based on what you know about the conditions under which the soil forms and the variations in climate and vegetation related to it.\r\n
    \r\n \t
  1. Chernozem<\/li>\r\n \t
  2. Luvisol<\/li>\r\n \t
  3. Podsol<\/li>\r\n \t
  4. Brunisol<\/li>\r\n \t
  5. Organic<\/li>\r\n<\/ol>\r\nSee Appendix 3 for Exercise 5.4 answers<\/a>.\r\n\r\n<\/div>\r\n<\/div>\r\n

    Image Descriptions<\/h3>\r\n<\/a>Figure 5.5.1 image description:<\/strong> Soil order map of Canada. Chernozem is found in the southern parts of the prairies provinces (Alberta, Saskachewan, and Manitoba). Luvisol is found in the BC interior, most of central and northern Alberta, and a strip through central Saskatchewan and Manitoba. Podsol is common on the eastern and western coastal areas, as well as northern BC, and much of Quebec and the maritime provinces. Brunisol is common in the southern parts of the territories, northern Sakachewan and Manitoba, as well as parts of Ontario and Quebec. Organic soil is scattered all over the country, but most concentrated in northern Ontario and the lowlands around Hudson Bay.\u00a0 Cryosol is predominant in the far north.\u00a0[Return to Figure 5.5.1]<\/a>\r\n

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