The Botany of Iceland - 01.12.1930, Side 43

STUDIES ON THE VEGETATION OF ICELAND
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Table 7. The Biological Spectra of the Species Groups.
Pt n Ph Ch H G HH Th
I’he whole flora 7.4 349 1.1 15.2 52.4 10.6 9.2 11.5
A-Group ,5.6 143 3> 26.6 53.1 11.2 2.8 6.3
E-Group 8.7 206 1.9 7.3 51.9 10.2 13.6 15.0
3.8 53 2- 30.2 52.8 11.3 3.8 1.9
A 2.... 4.0 50 > 26.0 52.0 10.0 2.0 10.0
A 1 12.5 40 $ 22.5 55.0 12.5 2.5 7.5
E 4 11.8 51 S 11.8 43.1 9.8 25.5 9.8
E 'i . . . . 10.4 48 2.1 6.3 56.3 12.5 10.4 12.5
E 2.. 8.2 49 4.1 8.2 59.2 10.2 2.0 16.3
E 1... 5.2 58 1.7 3.4 50.0 8.6 15.5 20.7
at the coasts increased, and the aniount of Gulf Stream water de-
creased, towards the west and north, until it reached its highest
value, 18 p. c. in East Iceland, at the same time as the Polar water
became prevalent at the coast. This was the result round the entire
coast, and on passing from tlie level of the sea towards the snow-
line the Ch. percentage rose very greatly, from c. 20 p. c. at the 300 m
curve to c. 50 p. c. at the snow-Iine, the 1200 m curve.
If we examine the relations of the species groups under the
same conditions, as done in table 5, we find a very close corre-
spondence behveen the A percentage and the Ch percentage. If we
proceed in the same way round the coast from South Iceland via
W. and N. to East Iceland, the A percentage shows an unbroken rise
Irom 39.2 p. c. in South Iceland, to 45.2 p. c. in East Iceland, and if
We pass from the sea to the snow-line, the same fact appears. The
A percenlage for the whole country is 40.3, at the 300 m curve it is
49.5, rising to 80 at the snow-line. The table likewise sliows the
i'elations of the subgroups. The 20 p. c. Ch biochore seems to coin-
eide with the 50 p. c. A biochore.
Raunkiær’s life forms and th e phytogeographical spe-
c<es groups thus react similarly to the same external
conditions. The species groups are, liowever, more sen-
silive than the life forms.
The Botany of Iceland. Vol. III.
3