Ordination on the basis of fuzzy set theory
- David W. Roberts
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Fuzzy set theory is an extension of classical set theory where elements of a set have grades of membership ranging from zero for non-membership to one for full membership. Exactly as for classical sets, there exist operators, relations, and mappings appropriate for these fuzzy sets. This paper presents the concepts of fuzzy sets, operations, relations, and mappings in an ecological context. Fuzzy set theory is then established as a theoretical basis for ordination, and is employed in a sequence of examples in an analysis of forest vegetation of western Montana, U.S.A. The example ordinations show how site characteristics can be analyzed for their effect on vegetation composition, and how different site factors can be synthesized into complex environmental factors using the calculus of fuzzy set theory.
In contrast to current ordination methods, ordinations based on fuzzy set theory require the investigator to hypothesize an ecological relationship between vegetation and environment, or between different vegatation compositions, before constructing the ordination. The plotted ordination is then viewed as evidence to corroborate or discredit the hypothesis.
I am grateful to Dr R. D. Pfister (formerly USDA Forest Service) for kind permission to publish data from a Forest Service study.
I would like to gratefully acknowledge the helpful comments and criticisms of Drs. G. Cottam, J. D. Aber, T. F. H. Allen, E. W. Beals, I. C. Prentice, C. G. Lorimer, and two anonymous reviewers.
- Allen, T. F. H. & Starr, T. B., 1982. Hierarchy: Perspectives for ecological complexity. The University of Chicago Press, Chicago. 310 pp.
- Beals, E. W., 1960. Forest bird communities of the Apostle Islands of Wisconsin. Wilson Bull. 72: 156–181.
- Beals, E. W., 1973. Ordination: Mathematical elegance and ecological naivete. J. Ecol. 61: 23–35.
- Bray, J. R. & Curtis, J. T., 1957. An ordination of the upland forest communities of southern Wisconsin. Ecol. Monogr. 27: 325–349.
- Dale, M. B., 1977. Planning and adaptive numerical classification. Vegetatio 35: 131–136.
- Dubois, D. & Prade, H., 1980. Fuzzy sets and systems: Theory and application. Academic Press, New York. 393 pp.
- Feoli, E., 1977. A criterion for monothetic classification of phytosociological entities on the basis of species ordination. Vegetatio 33: 147–152.
- Gauch, H. G., 1982. Multivariate analysis in community ecology. Cambridge Univ. Press, New York. 298 pp.
- Goldin, A. & Nimlos, T. J., 1977. Vegetation patterns on limestone and acid parent materials in the Garnet Mountains of western Montana. Northwest Sci. 51: 149–160.
- Greig-Smith, P., 1980. The development of numerical classification and ordination. Vegetatio 42: 1–9.
- Greig-Smith, P., 1983. Quantitative plant ecology. Third edition. Univ. of Calif. Press, Berkeley. 359 pp.
- Hitchcock, C. L. & Cronquist, A., 1973. Flora of the Pacific Northwest: An illustrated manual. Univ. of Wash. Press, Seattle. 730 pp.
- Kandel, A., 1982. Fuzzy techniques in pattern recognition. John Wiley and Sons, New York. 356 pp.
- Kaufmann, A., 1975. Introduction to the theory of fuzzy subsets: Vol. 1—Fundamental theoretical elements. Academic Press, New York. 409 pp.
- Loucks, O. L., 1962 Ordinating forest communities by means of environmental scalars and phytosociological indices. Ecol. Monogr. 32: 137–166.
- Orlóci, L. H., 1980. Preface. In: E. van der Maarel (ed.). Classification and ordination. Advances in vegetation science. Vol. 2. Dr. W. Junk, The Hague.
- Pfister, R. D. & Arno, S. F., 1980. Classifying forest habitat types based on potential climax vegetation. Forest Sci. 26: 52–70.
- Pfister, R. D., Kovalchik, B. L., Arno, S. F. & Presby, R. C., 1977. Forest habitat types of Montana. USDA Forest Service Intermt. For. and Range Exp. Stn., Gen. Tech. Rep. INT-34; 174 pp.
- Roberts, D. W., 1986. An anticommutative difference operator for fuzzy sets and relations. Int. J. Fuzzy Sets and Systems. In press.
- Whittaker, R. H., 1967. Gradient analysis of vegetation. Biol. Rev. 42: 207–264.
- Zadeh, L. A., 1965. Fuzzy sets. Inf. Control 8: 338–353.
- Ordination on the basis of fuzzy set theory
Volume 66, Issue 3 , pp 123-131
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
- Additional Links
- Environmental synthesis
- Fuzzy set theory
- Gradient analysis
- Ordination method
- Vegetation analysis
- David W. Roberts (1)
- Author Affiliations
- 1. Department of Botany, University of Wisconsin, Madison, U.S.A.