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1.
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It takes place in an area where no life existed before.
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It takes place in an area where life existed before but got destroyed due to some factors such as grazing, burning, felling of trees, sudden changes in climatic factors etc.
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2.
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It occurs in an area where no soil is present.
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It occurs in an area where soil is already present.
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3.
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It is a slow process.
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It is a fast process.
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4.
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It has a lower rate of production of biological material.
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It has a higher level of production of biological material.
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5.
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The areas included under this succession are bare rocks, newly created pond etc.
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The areas included under this succession are farm lands, flooded lands, burnt or cut forest etc.
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