Skógræktarritið - 15.05.2001, Side 184

Skógræktarritið - 15.05.2001, Side 184
through several filters in the pathway of regeneration. As pre- sented, the particular plant trait may be an advantage in some phases and a disadvantage in another. In an alpine meadow, several changes happen in the relative proportions of growth References ARCHIBOLD, O. W. 1984. A compari- son of seed reserves in arctic, sub- arctic and alpine soils. Can. Field- Nat. 98: 337-344. ARCHIBOLD, O. W. 1995. Ecology of World Vegetation. London. Chapman & Hall. 510 pp. BILLINGS, W. D. 1974. Arctic and alpine vegetation: plant adapta- tions to cold summer ciimates. In: ives, J. D. and Barry, R. G. (eds.), Arctic and Alpine environments, pp. 403-443. London, Methuen. Bliss, L. C. 1971. Arcticand alpine plant life cycles. Ann. Rev. Ecol. Syst. 2: 405-438. CHAMBERS, J. C. 1993. Seed and veg- etation dynamics in alpine herb field: effects of disturbance type. Can. J. Bot. 71: 471-485. CHAMBERS, J. C. 1995. Disturbance, life history, and seed fates in alpine herbfield communities. Am. J. Bot. 82: 421-433. CHAMBERS, J. C., MACMAHON, J. A. and BROWN, R. W. 1991. Alpine seedling establishment: the influ- ence of disturbance type. Ecoiogy 71: 1323-1341. ERIKSSON, O. 1992. Evolution of seed dispersal and recruitment in clonal plants. Oikos 63: 439-448. FOX, J. F. 1983. Germinable seed banks of interior Alaskan tundra. Arct. Alp. Res. 15: 405-411. FREEDMAN, B., HILL, N., SVOBODA, |. and HENRY, G. 1982. Seed banks and seedling occurence in a high Arctic oasis at Alexandra Fjord, Ellesmere Island, Canada. Can. J. Bot. 60: 2112-2118. GRIME, J. P., MASON, A. G„ CURTIS, A. V„ RODMAN, J„ BAND, S. R„ MOWFORTH, M. A. G„ NEAL, A. M. and SHAW, S. 1981. A comparative study of germination characteristics in a local flora. Journal of Ecology 69: 1017-1059. forms, states of clonality, dias- pore morphologies and seed sizes across the regeneration pathway, partly in an expected way (Welling and Laine b, in prep.). These changes are the reasons for relatively low floristic similarity between the consecu- JOHNSON, E. A. 1975. Buried seed populations in the subarctic forest east of Great Slave Lake, Norhwest Territories. Can. J. Bot. 53: 2933- 2941. KIVINIEMl, K. 1999. Evolution of seed attributes, dispersal and popula- tion dynamics of plants, with spe- cial emphasis on fragmented habi- tats. Doct. Diss. Department of Botany, Stockholm University. MCGRAW, J. B. and SHAVER, G. R. 1982. Seedling density and seeling survival in Alaskan cotton grass tus- sock tundra. Hol. Ecol. 5: 212-217. MOLAU, U. and LARSSON, E.-L. 2000. Seed rain and seed bank along an alpine altitudinal gradient in Swedish Lapland. Can. J. Bot. 78: 728-747. ROACH, D. A. 1983. Buried viable seed and standing vegetation in two tundra habitats, northern Alaska. Oecologia 60: 359-364. SCHUPP, E. W. 1995. Seed-seedling conflicts, habitat choice, and pat- terns of plant recruitment. Am. J. Bot. 82: 399-409. SHUTZ, W. and RAVE, C. 1999. The effects of cold stratification and light on the seed germination of temperate sedges (Carex) from vari- ous habitats and implications for regenerative strategies. Plant Ecology 144: 215-230. SEMENOVA, G. V. and ONIPCHENKO, V. G. 1993. Soil seed banks. In: Onipchenko, G. and BLINNIKOV, M. S. (eds.J, Experimental investi- gation ofalpine plant communities in the Northwest Caucasus. Veröffentlichungen des Geobotanischen institutes der Eidg. Tech. Hochschule, Stftung Rubel, in Ziirich, I 15. Heft, pp. 69-82. SIMPSON, R. L„ LECK, M. A. and PARKER, V. P. 1989. Seed banks: tive regeneration phases in the regeneration pathway. However, despite this low similarity, aclon- al plants dominate the standing vegetation. This indicates that regeneration by seed is effective in this community. General concepts and methodolog- ical issues. In : Leck, M. A„ Parker, V. T. and Simpson, R. L. (eds.l. Ecology of soil seed banks, pp. 3-8. SÖYRINKI, N. 1938. Studien uberdie generative und vegetative Vermehrung der Samenpflanzen in der Alpinen Vegetation Petsamo Laplands. I. AllgemeinerTeil. - Diss. University of Helsinki, Helsinki. 31 i pp. THOMPSON, K. 1978. The occurrence of buried viable seeds in relation to environmental gradients.). Biogeogr. 5: 425-430. THOMPSON, K„ BAKKER, J. P. BEKKER, R. M. and HODGSON, J. G. 1998. Ecological correlates of seed persistence in soil in the northwest European flora.). Ecol. 86: 163-169. WAGER, H. G. 1938. Growth and sur- vival of plants in the Arctic. J. Ecol. 26: 390-410. WELLING, P. 2000. Characteristics of seedling flora and soil seed bank in alpine vegetation, subartic Finland. Licentiate Thesis. University of Oulu. WELLING, P. and LAINE, K. 2000. Characteristics of the seedling flora in alpine vegetation, subarctic Finland. I. Seedling densities in 15 plant communities. Ann. Bot. Fenn. 37: 69-76. WELLING, P. and LAINE, K. a. The pathways of regeneration in two alpine plant communities. I. The early regeneration of plant cover. MS. WELLING, P. and LAINE, K. b. The pathways of regeneration in two alpine plant communities. II. Quantitative plant trait spectra in standing vegetation and changes in the plant traits across the pathway of regeneration. MS. 182 SKÓGRÆKTARRITIÐ 2001 1. tbl
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