The Botany of Iceland - 01.12.1930, Page 46
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H. M0LHOLM HANSEN
Table 8.
Species Group Spectra and Biological Spectra of the Altitudinal
Zones and Types of Vegetation in Vestfirðir
(based on Ingimar Óskarsson’s lists of species (1927).
n A E A 3 A2 A 1 E4 E3 E2 E 1 Ph Gh H G HH Th
4—500 m 14 93 7 50 43 » 7 » » > » 43 50 7 > »
3-400 - 35 89 11 52 34 3 9 3 » » » 43 46 9 3 >
2—300 - 74 68 32 27 27 14 16 14 3 > » 31 51 14 4 »
1—200 - 112 51 49 21 19 12 22 17 8 2 1 24 46 15 8 5
0—100 - 191 41 59 15 14 12 21 19 14 5 1 17 52 15 6 9
The entire area.. 212 44 56 16 16 11 19 18 13 5 1 18 52 14 7 8
Highland melar.. 45 82 18 42 31 9 13 4 » » » 40 49 11 » »
Dwarf willow veg. 27 70 30 22 41 7 19 4 7 » » 30 52 19 » »
Lowland melar .. 82 60 40 22 23 15 17 12 5 6 1 34 54 9 » *
Heath vegetation. 80 49 51 11 23 15 20 18 11 3 3 25 54 18 > 1
Mo vegetation . .. 73 51 49 15 25 11 18 19 8 4 » 22 56 14 > 8
Mj'ri vegetation.. 69 49 51 19 19 12 25 15 10 2 » 10 52 25 9 4
Littoral meadow. 20 50 50 35 5 10 25 25 » » » 10 60 15 > 15
Grass-field veg. . . 57 30 70 7 ii 12 18 25 19 9 » 12 60 12 > 16
Herb-field 31 32 68 10 23 » 23 26 16 3 » 19 61 16 » 3
13irch copse •47 23 77 4 11 9 26 28 21 2 4 21 40 30 » 4
Freshwater veg... 13 8 92 » 8 1 54 31 8 > » » 15 15 70 »
Hot springs 12 » 100 » > * 25 42 8 25 » 5 67 8 > 25
highest Ch percentage, the mo the highest H percentage, the mýri
the highest G percentage, and the freshwater vegetalion the highest
HH percentage.
A third group is formed by tlie littoral vegetation, the grassfield
vegetation, and the vegetalion of the hot springs. These three types
of vegetation are all characterised by a high H percentage and, in
proportion to the other types of vegetation and to the area as a
whole, an unusually high Th percentage. In the species group
spectra, however, they differ essentially.
Between the freshwater vegetation and the vegetation of the hot
springs which both show an unusually high E percentage, there is
a striking difference in the spectra of the E subgroups, the fresli-
water vegetation having its maximum in E 4 and the vegetation of
the hot springs in E 3. The deviation is, however, greatest in E 1