Íslenskar landbúnaðarrannsóknir - 01.09.1982, Síða 68

66 ISLENZKAR LANDBÚNAÐARRANNSÓKNIR
LITERATURE CITED
Arcker, S., and Detling, J.K. 1982. The effects of
defoliation and competition on regrowth of two
North American mixed-grass praire grami-
noids. Oecologia (submitted).
Archer, S., and Tiesgen, L.L. 1980. Growth and
physiological responses of tundra plants to
defoliation. Arctic and Alpine Reasearch
12:531-552.
Archer, S., and Tieszen, L.L. 1982, Responses of an
arctic tundra sedge to defoliation. Oecologia
(Submitted).
Arnalds, A. 1978. Uppskera í beitar-tilraununum.
Fjölrit frá Ráðunautafundi B.í. og Rala, 5-9
feb. 1978, 4:329-342.
Amalds, A. 1981. Áhrif beitarþunga á uppskeru,
gróðurnýtingu og arðsemi sauðljárbeitar. Fjölrit
frá Ráðunautafundi B.í. og Rala, 2-6 feb. 1978.
1:21-27.
Bliss, L.C. 1962. Adaptations of arctic and alpine
plants to environmental conditions. Arctic
15:117-144.
Bliss, L.C. 1966. Plant productivity in alpine
microenvironments on Mt. Washington, New
Hampshire. Ecol. Monogr. 36:123-155.
Bliss, L.C. 1970. Primary production within arctic
tundra ecosystems. In W.A. Fuller and P.G.
Keuan, eds., Productivity and conservation in
northern circumpolar lands. Internat. Union
Conserv. Natur., Morges, Switzerland, Publ.
16:17-85.
Buwai, M., and Trlica, M.J. 1977. Defoliation
effects on root weights and total nonstructural
carbohydrates of blue grama and western
wheatgrass. Crop Sci. 17:15-17.
Chapin, F.S. 1977. Nutrient/carbon costs associ-
ated with tundra adaptations to a cold, nut-
rient-poor environment. In Proceedings of the
Circumpolar Conference on Northern Ecology,
p. 1183-1194. Natural Resources Council of
Canada, Ottawa.
Chapin, F.S., and Slack, M. 1979. Effect of defolia-
tion upon root growth, phosphate absorption,
and respiration in nutrient limited tundra gra-
minoids. Oecologia 42:67-79.
Collins, D.P., Drennan, M.J., and Flynn, A.J. 1977.
Potential of Irish grassland for beef production.
In Proceedings of International Meeting on
Animal Production from Temperate Grassland,
p. 12-19, Dublin Ireland, 145 p.
Cook, C.W. 1966. Carbohydrate reserves in plants.
Utah Agric. Exp. Stn. Research Series 31.
Cook, C.W., and Child, R.D. 1971. Recovery of
desert plants in various states ofvigor. J. Range
Manage. 24:339-343.
Crider, F.S. 1955. Root-growth stoppage resulting
from defoliation of grass. United States Depart-
ment of Agriculture Technical Bulletin 1102, 23
P-
Davidson, J.L., and Milthorpe, F.L. 1966. The effect
of defoliation on the carbon balance in Dactylis
glomerata. Annals of Botany 30:185—198.
Dennis, P.G., and Johnson, P.L. 1970. Shoot and
rhizomeroot standing crops of tundra vegetation
at Barrow, Alaska. Arctic and Alpine Research
2:253-266.
Dennis, J.G., Tieszen, L. L., and Vetter, M. A. 1978.
Seasonal dynamics of above and belowground
production of vascular plants at Barrow,
Alaska. In L. L. Tieszen, ed., Vegetation and
production ecology of an Alaskan arctic tundra.
Springer-Verlag, New York, p. 113-140.
Detling, J.K., Dyer, M. I., and Winn, D. T. 1979.
Net photosynthesis, root respiration, and
regrowth of Bouteloua gracilis following simulated
grazing. Oecologia 41:127-134.
Donart, G.B. 1969. Carbohydrate reserves of six
mountain range plants as related to growth.
Journal of Range Managent 22:411-415.
Donart, G.B., and Cook, C. W. 1970. Carbohydrate
reserve content of mountain range plants follow-
ing defoliation and regrowth. Journal of Range
Management 23:15—19.
Ellison, L. 1960. Influence of grazing on plant
succession of rangelands. Botanical Review
26:1-78.
Evans, P.S. 1972. Root growh of Lolium perenne L.
III. Investigation of the mechanisms of defolia-
tion induced suppression of elongation. New
Zealand Journal of Agricultural Research
15:347-355.
Fonda, R.W., and Bliss, L. C. 1965. The annual
carbohydrate cycle of alpine plants on Mt.
Washington, New Hampshire. Bulletin of the
Torrey Botanical Club 93:268-277.
Graber, L.F., Nelson, N. T., Luekel, W. A., and
Albert, W. B. 1927. Organic food reserves in
relation to the growth of alfalfa and other
perennial herbaceous plants. Wisconsin