Alders (Alnus spp.), willows (Salix spp.), and dwarf birch (
Betula glandulosa) dominate shrub habitats.
TABLA I CONCENTRACION DE ELEMENTOS TIERRAS RARAS EN HOJAS DE PLANTAS NO ACUMULADORAS DE ESTOS ELEMENTOS Especie La Ce [micron]g x [kg.sup.-1] Lycopersicon esculentum 2,97-15,69 3,78-11,44 Dryobalanops lanceolata 4,65 132 Picea abies 10-100 ne Betula pubesceras 20-650 ne Agrostis capillaris 21-3751 24-8268 Taxodium japonicum 49,4 [+ o -] 0,6 75,3 [+ o -] 0,5
Betula glandulosa 50 70 Ledum palustre 60 120 Sorbus aucuparia 70-1930 ne Thea sinensis 71,5 [+ o -] 0,5 106 [+ o -] 2 Vicia villosa 71,7 [+ o -] 0,4 98,7 [+ o -] 0,5 Rubus fructicosus 76-336 55-185 Picea abies 78-110 60-110 Empetrum nigrum 80 160 Sasa nipponica 87 [+ o -] 2 113 [+ o -] 3 Abies alba 97 61 Populus nigra 100-535 186-890 Salix arcticum 120 190 Vaccinium vitis-idaea 130 210 Hedera helix 172 75 Matteuccia sp.
- Vegetation in the four carr sample plots was dominated by
Betula glandulosa and Salix spp.
serrulata (smooth alder),
Betula glandulosa (dwarf birch), B.
Other common species are beaked sedge (Carex utriculata), bog birch (
Betula glandulosa), mountain alder (Alnus incana), marsh reed grass (Calamagrotis canadensis), western dock (Rumex aquaticus), white clover (Trifolium repens), and strawberry (Fragaria ovalis).
6 fl Betulaceae:
Betula glandulosa Michaux 2 le
Betula glandulosa Michaux 8 le, st Betula nana L.
Other common species are beaked sedge (Carex utriculata), bog birch (
Betula glandulosa), mountain alder (Alnus incana), marsh reed grass (Calamagrostis canadensis), white clover (Trifolium repens), and strawberry (Fragaria ovalis).
The MCs region has an elevation range of less than 400 m: Scattered, stout conifer trees 13 m or more in height occur on reference sites within a matrix of tall (1.5-3 m), relatively dense
Betula glandulosa (dwarf birch) and Salix spp.
and
Betula glandulosa; Arctostaphylos uva-ursi and Rubus sp.
By 1300m, the spruce component of the vegetation is grouped into thick, low sprawling clumps (often with multiple stems) known as "krummholz" and interspersed with willow (Salix sp.) and birch (
Betula glandulosa) shrubs.
The southern boundary of subzone C represents the northern limit of the upright shrubs
Betula glandulosa and Salix lanata ssp.
Shrub willow (Salix glauca), dwarf birch (
Betula glandulosa), and, to a lesser extent, Shepherdia canadensis are important constituents of the regional vegetation, while alder (Alnus spp.) is scarce, present only as scattered shrubs (Johnson and Raup, 1964).
Betula glandulosa - small shrub of colder parts of North America and Greenland