Íslenskar landbúnaðarrannsóknir - 01.09.1980, Síða 52

50 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
1) Skýringar á tölum í töflu.
Explanation to numbers in the table.
1. Mosaþembur, — moss heath
2. Lyng- og hrísheiði - Empetrum - Vaccinium - Betula dwarf shrub heath
3. Víðiheiði - Salix dwarf shrub heath
4. Sef- og starmóar - Kobresia -Juncus - Carex heath
5. Graslendi - grasslands
6. Snjódældir - snowpatches
7. Blómlendi -forbs
8. Skóglendi - woodlands
9. Jaðrar - halfbogs
10. Hálfgrasa- og elftingarmýrar - Carex - Equisetum bogs
11. Runnamýrar - dwarf shrub bogs
12. Gulstararflóar - Carex Lyngbyei bogs
13. Fífu - tjarnastararflóar — Eriophorum angustifolium - Carex rostrata bogs
14. Nýgræður - secondary succession vegetation
15. Vatnagróður - aquatic vegetation
SUMMARY
Vegetation Classification in Iceland.
Steindór Steindórsson
Akureyri.
The chapter describes how plant species
make up plant communities and it presents
defmitions of the following terms: plant
sociations, plant associations, plant alliances
and plant orders.
For Iceland, plant orders are delineated
according to physiographical characte-
ristics, while the smaller plant communi-
ties are classified according to dominant
plant species. Borders between plant
communities often lack sharpness. On
Icelandic vegetation maps which are in
A. DRYLAND VEGETATION
I. Heath Vegetation
Covers dry, infertile areas, with a rela-
tively few plant species.
1. Moss heath
Occurs most extensively in highland are-
as. It thrives in very cold, dry, inhospitable
scales 1 : 40 000 and 1 : 20 000, com-
plexes composed of two or more com-
munities often cover a given mapping
area. In fact it becomes unavoidable to
include such complexes as separate
mapping units delineated on vegetation
maps. Whereappropriate,plantcommuni-
ties are characterized or defined by a few
higher species (fanerogams) which are
easy to determine and which are domi-
nant as far as visible appearance (physi-
ognomy) and vegetative growth are con-
cerned. The chapter describes the main
characteristics of the plant communities,
and the names of the most common and
relevant plant species are compiled in
tables.
enviroments devoid of soil, and with-
out shelter. Rhacomitrium covers more than
50 per cent of the surface community,
flowering plants are few and scattered.
2. Dwarfshrub heath
Covers well to fairly well drained soils,