This is a fairly broad question given that there are many kinds of natural disasters and many kinds of ecosystems to which such disasters may happen. But in general, life only needs a tiny toehold with which to start to regain its former abundance, and once this process begins, the ecosystem will normally start to heal in some way. However, some disasters are more destructive than others, and in some cases recovery is very slow.
After a natural disaster in a healthy ecosystem, the ecosystem goes through a process of recovery and regeneration. Natural processes like succession and adaptation allow the ecosystem to gradually restore itself back to its original state. Plant and animal populations may fluctuate, but the ecosystem eventually regains its balance and diversity over time.
The more variety and the larger the number of species living in an ecosystem, the better it is able to recover from a natural or man made disaster, i.e., the more producers that are present, the less likely that overconsumption of one part will have a permanent negative effect on the ecosystem as a whole.
A change in climate or natural disaster might change an ecosystem very quickly.
The IT disaster recovery plan is a complete process and set of rules that would recover the whole data used in an IT system of a business in case of a disaster. The disaster can either be man-made or natural.
A change in climate or natural disaster might change an ecosystem very quickly.
After a natural disaster has damaged a local ecosystem, there will likely be a period of recovery and restoration as the ecosystem tries to rebuild itself. This may involve changes in species composition, soil fertility, and overall ecosystem balance. Human intervention through restoration efforts may also be necessary to facilitate the recovery process.
By luck
When a natural disaster causes an adverse event that leads to the death of people and the destruction of property, then it is referred to as a natural hazard. The adverse events have to be natural and not influenced by man in anyway to be considered as adverse.
It could take the ecosystem years and possibly decades to recover from such an infusion of oil and gas.
Vital Records
A tornado is both. A calamity is a disaster. A tornado is a disaster that occurs naturally, and would thus be consideted a natural calamity or natural disaster.
Volcanoes are a natural disaster!