In the described scenario we have a destruction of an ecosystem because of natural causes, volcano in this case. All that has left after the volcanic eruption has been barren land. After this has happened life started colonizing the volcanic island again, in a process known as primary succession. In the primary succession it is the organisms that have the lowest of requirements for survival that will inhabit the island. Over time, as they die, they will provide biomass for the ground, thus soil will start to form. Once there's soil formed a process called secondary succession will start. In this process the island will start to be inhabited by some plants and smaller animals. These plants and animals will contribute to further enhancing the living conditions on the island, and the island will gradually be getting larger plants and larger animals, thus a new ecosystem will be formed on the place of the old one.
The soil named chernozem is a black colored soil found in Russia and has a high percentage of the humus contents that is 4 to 16% and consists of the folic acid and phosphorous and the ammonia.
Thus is very fertile soil and has a high agricultural yield and this soil consist of the high moisture storage capacity thus is supportive of the large agricultural cultivation.
