Explain why ecological succession will be faster in a forest devastated by fire then on a bare rock? Also compare succession in case of an abandoned land after floods with that on a bare rock?

Explanation

Since some soil or sediment is present, succession is faster in a forest devastated by fire than on a bare rock.
In secondary succession in an abandoned land after floods, the species that invade depend on the condition of the soil, availability of water, the environment as also the seeds or other propagules present. Since soil is already there, the rate of succession is much faster and hence, climax is also reached more quickly.
On a bare rock, the establishment of a new biotic community is generally slow. Before a biotic community of diverse organisms can become established, there must be soil. Depending mostlyon the climate, it takes natural processes several hundred to several thousand years to produce fertile soil on bare rock.