Jökull - 01.12.1981, Blaðsíða 20

DISTRIBUTION OF PRINCIPAL PLANT SPECIES
• WEST TRANSECT 150 140 130 120 110 100 90 80 76IIICE
o EAST TRANSECT 1 11 21 31 41 51 61 71 751| FRONT
DISTANCE FROM ICE 0 100 200 300 400 500 600 700metres
Ca|iv hprharpa ••• •• •••••• ••• •••••• ••• • • ••• •
oaiiA neiuauca OOOOOOO O OOOOOOOOO O O O OO OO O O O O O O O
Saxifraga oppositifolia 00 00 00 o 00 o 000 o* o o
Saxifraga caespitosa 0 0 QO 0 000 0000000 0000 o 00 0*00*000 *oooooooo o *o **
Saxifraga hypnoides 000 o 00 000 o 00 o 00 00 00 00 *
Saxifraga stellaris 0 *J0
Saxifraga nivalis ........ 0...................0* •• •
Saxifraga cernua * ...............................................
Q I______......______ •••••• ••••• ••• ••••••••• • • •• • •••• • • • •
roiygonum viviparum 000 00000 000000000 00 000 00 00 o 00 o
Oxyria digyna 000 000* 0000000 00 o *ooo* o *o o 00 00*0* ••••• *Q
Alchemilla alpina ** 00*0 * * ** o o
Alchemilla vulgaris 0
_ • • • • • ••• • • •
cerastium aipinum 0 0 00 0 0 00 0 0
c ,______ •••• •••••• ••••• •••• • •• •• • •• ••••• • •• •
oiiene acauns 00 0 00 0000 000000 00 o o
Arabis alpina 000 o 000
Cassiope hypnoides 0
Empetrum hermaphroditum 0*0 ** **
_ . .. •• ••• • • •
Gnaphalium norvegicum 00 000 o 000 000 o 00
Gramineae 0o 00 0000 0000000 0000 0000 000 0000 00000000 00 000000 00 o 000
-*■ „11 * „ ••••• • • • • ••• ••• • • • • • •
Taraxacum cf. laevigatum 00 o 0000 o 00 00 o o
Veronica alpina o o
Minuartia rubella o 00 o 00 00 o o 00
Bartsia alpina * 00*** * o o 00 o * 00**000 000 00
Ranunculus acris 0 0
Carex Bigelowii * * ............. *** 0
_ .. . . ...... • • • • •• ••• ••• •• • ••••• ••••• ••••••
Epilobium anagallidifolium 0 o
Cochlearia officinalis 0
Vaccinium myrtillus 0 0
Sibbaldia procumbens 00 000
Fig. 4. Presence and absence of principal plant species along transects.
Mynd 4. Niðurstöður athugana á gróðri við jökulrönd.
the ice-cored ridge is much more akin to the
supraglacial morainic material, although the
latter was not sampled. This conclusion needs
to be tested by a more rigorous investigation of
the sedimentary properties of the ridge, glacier
sole and supraglacial materials from which
genetic deductions may be forthcoming.
A limited pebble roundness study was made
of two samples from moraine ridge 17, two
samples from a morainic ridge in Skíðadalur,
and one sample from the bedload of the
stream issuing from Gljúfurárjökull, using the
roundness index of Tricart and Schaeffer (1950).
Again, interpretation is inhibited by shortage
of data, but the samples from the two
morainic i idges are very similar to each other,
and distinctly different from the stream
bedload sample (Fig. 3). Furthermore, despite
18 JÖKULL 31. ÁR