Íslenskar landbúnaðarrannsóknir - 01.09.1982, Page 69

Íslenskar landbúnaðarrannsóknir - 01.09.1982, Page 69
SPRING GRAZING 67 Agricultural Experiment Station Research Bul- letin Number 80, 128 p. Haloway, J.G., and Ward, R. T. 1965. Phenology of alpine plants in northern Colorado. Ecology 46:72-83. Hodgkinson, K.C., and Baas Becking, H. G. 1977. Effect of defoliation on root growth of some arid zone perennial plants. Australian Journal of Agricultural Research 29:31—42. Jameson, D.A. 1963. Responses ofindividual plants to harvesting. Botanical Review 29:532-594. Jónsson, K. 1974. Vorbeit — áhrif á uppskeru. Fjölrit frá Ráðunautafundi B.í. og Rala, 6 bls. Mattheis, P.J., Tieszen, L. L., and Lewis, M. C. 1976. Responses of Dupontia Jisheri to simulated lemming grazing in an Alaskan arctic tundra. Annals of Botany 40:179-197. May, L.H. 1960. The utilization of carbohydrate reserves in pasture plants after defoliation. Herbage Abstracts 30:239-254. McCarty, E.C., and Price, R. 1942. Growth and carbohydrate content of important mountain forage plants in central Utah as affected by clipping and grazing. United States Depart- ment of Agriculture Technical Bulletin 818, Washington, D.C., 51 p. McCown, B.H., and Tieszen, L. L. 1972. A compa- rative investigation of periodic trends in carbohydrate and lipid levels in arctic and alpine plants. Proceedings 1972 United States Tundra Biome Symposium, p. 40—45. McNaughton, S.J. 1979. Grazing as an optimization process: Grass-ungulate relationship in the Serengeti. Amerian Naturalist 113:691—703. Menke,J.YJ. and Trlica, M.J. 1983. Effects of single and sequential defoliations and the reserve status of four range species. Journal of Range Management (in press). Miller, P.C., Stoner, W. A., Tieszen, L. L., Allessio, M., McCown, B., Chapin, F. S., and Shaver, G. 1978. A model of carbohydrate nitrogen, phos- phorus alloccation and growth in tundra pro- duction. In L. L. Tieszen, ed., Vegetation and production ecology of an Alaska arctic tundra. Springer-Verlag, New York, p. 577-598. Mitchell, W. M. 1979. Iceland: Productive north- land. Agroborealis 11:28-31. Mooney, H. A., and Billings, W. D. 1960. The annual carbohydrate cycle of alpine plants as related to growth. American Journal of Botany 47:594-598. Mooney, H. A., and Billings, W. D. 1965. Effects of altitude on carbohydrate content of mountain plants. Ecology 46:750-761. Mueggler, W. F., 1972. Influence of competition on the response of bluebunch wheatgrass to clipp- ing. Journal ofRange Management 25:88-92. Mueggler, W. F. 1975. Rate and pattern of vigor recovery in Idaho fescue and bluebunch wheat- grass. Journal of Range Management 28:198- 204. Owensby, C. E., Paulsen, G. M., and McKendrick, J. D. 1970. Effect of burning and clipping on big bluestem reserve carbohydrates. Journal of Range Management 23:358-362. Óskarsson, M. 1982. Beit á ræktað og óræktað mýrlendi. Freyr 78:683-689. Pearsall, W.H. 1950. Mountains and moorlands. Collins, London 312 p. Reynolds, H.G., and Martin, S. C. 1968. Managing grass-shrub cattle ranges in the southwest. United States Department of Agriculture Hand- book 162. Scott, D., and Billings, W. D. 1964. Effects of environmental factors on standing crop and productivity of an alpine tundra. Ecological Monographs 34:243-270. Smimov, V. S., and Tokmakova, S. G. 1971. Pre- liminary data on the influence of different numbers of voles upon the forest tundra vegeta- tion. Annales Zoologici Fennici 8:154—156. Smirnov, V. S., and Tokmakova, S. G. 1972. Influence of consumers on natural phytocenoses production variation. In F. E. Wielgolaski and T. Rosswall, eds., Tundra Biome Proceedings IV, International Meeting on Biological Pro- ductivity of Tundra. Leningrad, USSR, p. 122- 127. Smith, D. 1964. Winter injury and the survival of forage plants: A review. Herbage Abstracts 34:203-209. Smith, D. 1975. Trends of nonstructural carbohy- drates in the stembases of switchgrass. Journal of Range Management 28:389-391. Spetzman, L. A. 1959. Vegetation of the arctic slope of Alaska. United States Geological Survey professional Paper Number 302(B), p. 19-58. Stoddart, L. A., Box, T. W., and Smith, A. D. 1975. Range management. McGraw Hill Book Gom- pany, New York, 532 p. Stickler, G.S. 1961. Vegetation and soil condition changes on a subalpine grassland in eastern 5

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