The Botany of Iceland - 01.12.1930, Page 123
STUDIES ON THE VKGETATION OE ICI'.I.ANI)
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Table 24 n.
Biological Spectra of the Mvri and Flói Vegetation.
1 2 3 4 5 6 7 8 9 10 11 12 13
Foints sum 944 768 840 840 436 404 496 504 504 276 196 212 248
Number of species . . 23 27 22 20 11 10 10 13 12 5 8 10 6
Deusity of species .. 9.4 7.7 8.4 8.4 4.4 4.0 5.0 5.0 5.0 2.8 2.0 2.1 2.5
A .... 51.3 64.1 55.2 53.8 67.9 66.3 70.2 65.1 62.7 7.2 49.0 45.3 38.7
E . 48.7 53.9 44.8 46.2 32.1 33.7 29.8 34.9 37.3 92.8 51.0 54.7 61.3
A 3 35.2 49.0 49.0 37.6 25.7 40.6 36.3 42.9 20.6 7.2 20.4 41.5 11.3
A 2. 14.0 13.5 5.7 13.3 22.9 24.8 20.2 19.8 19.8 > 10.2 1.9 27.4
A 1... 2.1 1.6 0.5 2.9 19.3 1.0 13.7 2.4 22.2 » 18.4 1.9 »
E 4 48.7 35.9 43.8 44.7 30.3 33.7 10.5 34.9 37.3 49.3 51.0 54.7 54.8
E 3... » » 1.0 1.4 1.9 » 19.4 » » 43.5 » » 6.5
E 2 » » » » » » » » » » » »
E 1. . . » » » » » » » » » » » » »
Gh .... 26.7 27.1 23.3 32.9 10.1 19.8 16.9 15.9 7.9 » 14.3 5.7 4.8
H .. 26.7 28.6 31.0 16.7 8.3 8.9 11.3 13.5 13.5 13.0 » 32.1 14.5
G .. .. 45.7 43.8 45.2 48.6 79.8 71.2 52.4 70.6 78.6 79.7 85.7 62.3 74.2
hh . . » ) 0.5 1.4 1.8 » 19.4 » » 7.2 » » 6.5
Th ... 0.8 0.5 » 0.5 » » » » » »
damp soil, the Carex rariflora mýri on damper soil, and the Erio-
phorum polystacliyum flói on the dampest ground. In table 24 A,
Nos. 1—4 represent the knolly mýri, 5—9 the Carex rariflora mýri,
and 10—13 the llói.
The knolly Carex mýri is most abundant in species and shows
the greatest density of species of the mýri formations. The number
°f species is 23, and the density 8.5. Ch play a more prominent
Part here than in the jaðar and attain a relative maximum of 27.5
per cent. H show a strong decrease, while the rise in G is still
continuing; the last Th meet with the first HI4. The species group
spectrum shows a large content of A 3 and E 4 species.
The physiognomic dominants are the chamaephytes and the
f'yperaceæ, of the chamaephytes especially Salix herbacea, S. glauca,
a«d S. phylicifolia, further Empetrum nigrum and Vaccinium uligi-
nosnm, of the Cyperaceæ Eriophorum polystachyum, Carex rigida,
C. dioica, C. rariftora, and here and there Carcx alpina and C. sax-
fhe Botany of Icelaml. Vol. III.
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