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《Acta Ecologica Sinica》 1989-02
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THE DISCRIMINATORY INDEX WITH REGARD TO THE WEAKNESS, OVERLAPNESS,AND BREADTH OF ECOTONE

Niu Wenyuan (Research Center for Eco-environmental Sciences, Academia Sinica)  
ECOTONE, a new definition of ecological field, was approved by the plenary session of Ⅶ SCOPE in 1988 (Budapest). In order to have a better understanding attributions, connotations, and significations of the term, we have already provided a systematic description and logical induction. In this article, the author would use the ecological boundary theory and the technique of information measure to develop the Index Series which can be applied to determine the basic properties of ECOTONE. Generally, these indeces Would include the breadth, the overlapness, the weakness, and the synthetical index expressing dynamic characteristics of ECOTONE.In biosphere, spatial generalization of ECOTONE could be summarized as follows:(1)Connecting zone between urban and country;(2)Mixture zone between arid and humid climate regions;(3)Intersection zone between agricultural and animal husbandry regions;(4) Join zone between land and water body;(5)The periphery of a forest; (6)The fringe of a desert;(7) Sudden change of the gradients (such as altitude, concentration, hardness, and so forth).
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