Ecological gradients of boreal forests in South Finland: an ordination test of Cajander's forest site type theory
Tóm tắt
Ecological gradients in the field layer of southern boreal forests in South Finland were studied in relation to the dominant tree species and the age of forest stands. The data are from a systematic sample of 529 plots from an area of 150 × 200 km, collected in the Third National Forest Inventory in 1951–53. Detrended correspondence analysis (DCA) was applied to log-transformed species cover values. It revealed three main gradients: fertility, moisture, and the effect of cattle grazing in forests (still extensive in the early 1950's). The fertility gradient dominated the first axis and the two latter sources of variation confounded with it in a complex manner in the first two axes of DCA. The second DCA axis was associated with canopy effects on understory pattern, with Pinus and Picea having opposite and Betula intermediate effects. These results were compared with an ordination model of Cajander's forest site types, based on DCA of independent, ideal data of 107 indicator species. The fertility gradient recovered by the model was almost identical to that obtained from the field data. The gradient was also stable from intermediate-age (40–69 yrold) to older forests. The forest site types showed rather large overlaps with main neighbouring types in composition of ground vegetation or nutrient status of the humus. Competitively efficient feather-mosses, which are dependent on nutrients released from the tree crowns, are considered important regulators of the understory vegetation. Accordingly, alternative approaches to the forest site type classification to be used in boreal forests treated by modern intensive forestry should give more weight to the effect of the canopy trees.
Tài liệu tham khảo
Aaltonen, V. T., 1925. Über den Aziditätsgrad (pH) des Waldbodens. Comm. Inst. Forest. Fenn. 9(6): 1–54.
Ahti, T., Hämet-Ahti, L. & Jalas, J., 1968. Vegetation zones and their sections in northwestern Europe. Ann. Bot. Fenn. 5: 169–211.
Atlas of Finland, 1960. The Geographical Society of Finland. Otava, Helsinki.
Beals, E. W., 1984. Bray-Curtis ordination: an effective strategy for analysis of multivariate ecological data. Adv. Ecol. Res. 14: 1–55.
Bergeron, Y. & Bouchard, A., 1983. Use of ecological groups in analysis and classification of plant communities in a section of western Quebec. Vegetatio 56: 45–63.
Cajander, A. K., 1909. Ueber Waldtypen. Acta Forest. Fenn. 1: 1–175.
Cajander, A. K., 1926. The theory of forest types. Acta Forest. Fenn. 29(3): 1–108.
Carleton, T. J. & Maycock, P. F., 1980. Vegetation of the boreal forests south of James Bay: non-centered component analysis of the vascular flora. Ecology 61: 1199–1212.
Frey, T. E. A., 1973. The Finnish school and forest site-types. In: R. H. Whittaker (ed.), Ordination and classification of communities, pp. 405–433. Junk, The Hague.
Gauch, H. G., 1973. The relationship between sample similarity and ecological distance. Ecology 54: 618–622.
Gauch, H. G., 1982a. Noise reduction by eigenvector ordinations. Ecology 63: 1643–1649.
Gauch, H. G., 1982b. Multivariate analysis in community ecology. Cambridge Univ. Press, Cambridge.
Grandtner, M. M. & Vaucamps, F., 1982. Vegetation science and forestry in Canada. In: G. Jahn (ed.), Handb. Vegetat. Sci. 12: 15–45, Junk, The Hague.
Hill, M. O., 1979. DECORANA. A Fortran program for detrended correspondence analysis and reciprocal averaging. Ecology and Systematics, Cornell University, Ithaca, N.Y.
Hill, M. O. & Gauch, H. G., 1980. Detrended correspondence analysis: an improved ordination technique. Vegetatio 42: 47–58.
Hustich, I., 1960 (ed.). Forest types and forest ecosystems. Silva Fenn. 105: 1–142.
Ilvessalo, Y., 1951. III valtakunnan metsien inventointi. Suunnitelma ja maastotyön ohjeet. (Summary: Third national forest survey of Finland. Plan and instructions for field work). Comm. Inst. Forest. Fenn. 39(3): 1–67.
Ilvessalo, Y., 1956. Suomen metsät vuosista 1921–24 vuosiin 1951–53. Kolmeen valtakunnan metsien inventointiin perustuva tutkimus. (Summary: The forests of Finland from 1921–24 to 1951–53. A survey based on three national forest inventories). Comm. Inst. Forest. Fenn. 47(1): 1–227.
Johnson, E. A., 1981. Vegetation organization and dynamics of lichen woodland communities in the northwest territories, Canada. Ecology 62: 200–215.
Kalela, A., 1960. Classification of the vegetation, especially of the forests, with particular reference to regional problems. Silva Fenn. 105: 40–49.
Kielland-Lund, J., 1982. Forest types and their application in forestry in Norway. In: G. Jahn (ed.), Handb. Vegetat. Sci. 12: 377–386, Junk, The Hague.
Kujala, V., 1979. Suomen metsätyypit. (Summary: Forest types of Finald). Comm. Inst. Forest. Fenn. 92(8): 1–45.
Kuusipalo, J., 1983. Distribution of vegetation on mesic forest sites in relation to some characteristics of the tree stand and soil fertility. Silva Fenn. 17: 403–418.
Lampimäki, T., 1939. Nautakarjan laiduntamisesta metsämailla. (Ref.: Über den Waldweidegang des Rindviehs). Silva Fenn. 50: 1–106.
Linkola, K., 1916. Studien über den Einfluss der Kultur auf die Flora in den Gegenden nördlich vom Ladogasee. I. Allgemeiner Teil. Acta Soc. Fauna Flora Fenn. 45(1): 1–429.
Mikola, P., 1982. Application of vegetation science to forestry in Finland. In: G. Jahn (ed.), Handb. Vegetat. Sci. 12: 199–224. Junk, The Hague.
Oksanen, J., 1983a. Ordination of boreal heath-like vegetation with principal component analysis, correspondence analysis and multidimensional scaling. Vegetatio 52: 181–189.
Oksanen, J., 1983b. Vegetation of forested inland dunes in North Karelia, eastern Finland. Ann. Bot. Fenn. 20: 281–295.
Oksanen, J. & Ahti, T., 1982. Lichen-rich pine forest vegetation in Finland. Ann. Bot. Fenn. 19: 275–301.
Sarvas, R., 1951. Tutkimuksia puolukkatyypin kuusikoista. (Summary: Investigations onto the spruce stands of Vaccinium type). Comm. Inst. Forest. Fenn. 39(1): 1–82.
Sepponen, P., 1985. The ecological classification of sorted forest soils of varying genesis in northern Finland. Comm. Inst. Forest. Fenn. 129: 1–77.
Sirén, G., 1955. The development of spruce forest on raw humus sites in northern Finland and its ecology. Acta Forest Fenn. 62(4): 1–408.
Sokal, R. R. & Rohlf, F. J., 1981. Biometry. 2nd ed. W. H. Freeman, San Francisco.
Tamm, C. O., 1953. Growth, yield and nutrition in carpets of a forest moss (Hylocomium splendens). Meddel. fran Statens Skogsforskningsinst. 43(1): 1–140.
Tamm, C. O., 1964. Growth of Hylocomium splendens in relation to tree canopy. Bryologist 67: 423–426.
Valmari, J., 1921. Beiträge zur chemischen Bodenanalyse. Acta Forest. Fenn. 20(4): 1–67.
Van der Maarel, E., 1979. Transformation of cover-abundance values in phytosociology and its effects on community similarity. Vegetatio 39: 97–114.
Vuokila, Y., 1956. Etelä-Suomen hoidettujen kuusikoiden kehityksestä. (Summary: On the development of managed spruce stands in southern Finland). Comm. Inst. Forest. Fenn. 48(11): 1–138.
Whittaker, R. H., 1962. Classification of natural communities. Bot. Rev. 28: 1–239.
Whittaker, R. H., 1967. Gradient analysis of vegetation. Biol. Rev. 42: 207–264.
Williamson, M. H., 1983. The land-bird community of Skokholm: ordination and turnover. Oikos 41: 378–384.