Fróðskaparrit - 01.01.2006, Side 131

ÚTBREIÐSLAN AV LÍVSHÆTTUM RAUNKIÆRS
NIÐAN EFTIR FJALLASÍÐUM í FØROYUM
129
alpine zone is seen to be due to low total veg-
etation cover, as therophytes are commonly
found as the only life-form in unstable soils
such as screes, fellfields and patterned fields.
We, therefore, suggest that the effect of
environmental factors, such as soil distur-
bance, override the effect of climatic pa-
rameters for therophytes. Thus, disturbance
°f the soils due to reduced vegetation cover
ls most likely the best explanation for the
high abundance of therophytes.
Acknowledgements
would like to acknowledge Magnus
Gaard and Erla Olsen for assistance with the
iieldwork. This paper is a part of the proj-
ect: Vegetation zones in relation to climate
1,1 some Faroese mountains, which is partly
funded by the Danish Research Council (the
North Atlantic Programme) and the Faroese
^luseum of Natural History.
^eferences
Socher, T.W. 1937. Nogle studier over Færøernes
alpine vegetation. Bot.Tid. 44: 154-201.
I.E. 1981. Macroclimate and plant forms: An
introduction to predictive modelling in phyto-
geography. Dr W. Junk Publisher, The Hauge/
Boston/ London.
Banin, A. and Orshan, G. 1990. The distribution of
Raunkiær life-forms in Israel in relation to envi-
ronment. J. Veg. Sci. 1: 41-48.
f*'az> S. and Cabido, M. 1997. Plant functional types
and ecosystem function in relation to global
change. J. Veg. Sci. 8: 463-474.
Ulaz, S„ Cabido, M„ Martínez Carretero, E. and Ar-
naíbar, J. 1999. Plant functional traits, ecosystem
structure, and land-use history along a climatic
gradient in central-western Argentina. J. Veg.
&/. 10: 651-658.
laz> S„ Marcclo, C. and Casanoves, F. 1997. Plant
functional traits and environmental filter at a re-
gional scale. J. Veg. Sci. 9: 113-122.
°saa, A.M., Hansen, B. and Gaard M. 2001. Soil tem-
perature in the Faroese Mountains. Data report.
Faroese Museum ofNatural Histoiy. Tórshavn,
Faroe Islands.
Fosaa, A.M. 2004. Altitudinal distribution of plant
communities in the Faroe Islands. Fróðskaparrit,
51:200-211.
Gitay, H. and Nobel I.R. 1997.What are functional
types and how should we seek them?-hr. Smith,
T. M„ Shugart, H. H. & Woodward, F. 1. (eds.)
Plant functional types: their relevance to ecosys-
tem properties and global change. 3-19. Cam-
bridge University Press, Cambridge.
Gomez, D„ Sese, .1. A„ Ferrández, J.V. and Aldeza-
bal A. 1993. Altitudinal variation of floristic fea-
tures and species richness in Spanish Pyrenees
Alpine belt. In: Island and high mountain vege-
tation: biodiversity, bioclimate and conservation.
Procedings of IAVS symposium Tenerife, Uni-
versidad de la Laguna, Serie lnformes n° 40.
Grime, J.P., Hodgson, J.G. and Hunt, R. 1988. Com-
parative plant ecology a functional approach to
common British species. London, unwin Hyman.
Grime, J.P., Hodgson, J.G., Hunt, R„ Thompson, K„
Hendry, G.A.F., Campbell, B.D., Jalili, A„ Hel-
lier, S.H., Diaz S. and Burke, M.J.W. 1997. Func-
tional typcs: Testing the concept in Northern Eng-
land.-In: Smith, T.M., Shugart, H.H. and Wood-
ward, F.I. (eds.) Plantfunctional types: tlieir rel-
evance to ecosystem properties and global
change. 122-150. Cambridge University Press,
Cambridge.
Hadar, L„ Noy-Meir, I. and Perevolotsky, A. 1999.
The effect of shrub clearing and grazing on com-
position of a Mediterranean plant community:
functionalgroupsversusspecies.J. Veg.Sci. 10:5.
673-682.
Hansen, K. 1972. Vertical vegetation zones and ver-
tical distribution types in the Faeroes. Bot. Tid.
67:33-63.
Hobbs, R. J. 1997. Can we use plant functional types
to describe and predict responses to environmen-
tal change? - In: Smith, T. M„ Shugart, H. H. &
Woodward, F. I. (eds). Plantfimctionaltypes: their
relevance to ecosystem properties and global
change: 66-90. Cantbridge University Press,
Cambridge.
Intergovernmental Panel on Climate Change. 2001.
Climate change 2001: impact adaptation and vul-
nerability. Summary for policymakers. Intergov-
emmental Panel on Climat Change. Cambridge
University Press, Cambridge.