 With time and stable environmental conditions, some Brunisolic soils will evolve to Luvisolic soils; others, to Podzolic soils.Covering almost 790 000 km2 (8.6%) of Canada's land area, Brunisolic soils occur in association with other soils in all regions south of the permafrost zone.Four great groups are distinguished on the basis of organic matter enrichment in the A horizon and acidity.