A model which tries to explain vegetational history - usually as a series of phases culminating in a terminal phase of equilibrium. It is maintained that there are points in vegetational history beyond which there can be no progress until the environmental conditions change. The stages leading up to these climaxes (seres) represent the gradual replacement of one ecosystem with another until a stabilized point (equilibrium) is attained. In different areas these climaxes take different forms depending on climate. A change in the climax vegetation therefore means a change in environmental conditions.
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