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have both deeper profiles and strbnger profile development .
The solum of Luvisolic soils is generally very acid (pH 4 .2 to
4 .9) and contains high amounts of exchangeable hydrogen, indicating
a strong leaching condition .
8 .2 .1 .2 Brunisols
The Brunisols consist of well and imperfectly drained soils
that have developed under mixed deciduous-coniferous and coniferous
types of vegetation in the Boreal Forest Zone and under a heath type
of vegetation in the Alpine and Tundra Zones .
These soils have organic surface horizons (L-H) . They may also
have an eluvial horizon (Ae)
and all have a brownish Bm horizon, but
none have a Bt or a podzolic B horizon .
Brunisolic soils constitute
one of the most common soil groups found in the Mackenzie River area,
especially in the middle and northern portions of the area . Their
descriptions are as follows :
Eutric Brunisols
These soils have the general characteristics of the Brunisols ;
they have organic surface horizons (L-H) and a brownish Bm horizon .
They may also have an Ae or Aej horizon . In the middle and northern
Boreal and Tundra Regions (Zones 3, 2, 1 and 0) these soils are
associated with permafrost and are greatly affected by cryoturbation .
They have developed on glacial till, alluvium, colluvium, sand, gravel
and lacustrine sediment .
They are mapped as moraine plains, drumlins,
flutings, ridge moraines, hummocky moraines, subdued hummocky and
rolling moraines, alluvial terraces, colluvial complexes,
aeolian
deposits, glaciolacustrine beaches,
glaciolacustrine thermokarst