| The propostion of synthesizing unit definition has improved the function which discribes the pradator growth with Liebig's minimum rule, which make it from uncontinuous to continuous. Synthesizing unit is used in modeling prey-predators system in this paper; analytical analysis and numerical analysis are also carried through; complex dynamic behaviors is showed in the model. Three species can coexist and be in steady state under some conditions, which suggests that chemical heterogeneity promotes the species diversity or ecosystem diversity.
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