* Rainforests are already established ecosystems: Rainforests are characterized by a high level of biodiversity and complex interactions between species. They are already in a state of ecological maturity.
* Lack of bare rock: Primary succession begins on bare rock, where no soil exists. Rainforests have a thick layer of soil and organic matter, making it difficult for primary succession to start.
* High rate of decomposition: The warm, humid climate of rainforests promotes rapid decomposition of organic matter. This means that any new exposed rock would quickly be colonized by organisms, leading to secondary succession rather than primary succession.
Secondary succession is more likely to occur in rainforests. This happens when a disturbance, such as a fire or logging, clears out existing vegetation but leaves soil intact. The process then involves the regrowth of vegetation from the existing soil.
