DENDROLOGY

Detailed explanation-1: -Secondary succession occurs when there has been a disturbance to an existing community that removes or damages the vegetation, but does not remove the existing soil. The pioneer species in secondary succession start with roots or seeds that remain after the disturbance.

Detailed explanation-2: -Secondary succession occurs when the severity of disturbance is insufficient to remove all the existing vegetation and soil from a site. Many different kinds of disturbances, such as fire, flooding, windstorms, and human activities (e.g., logging of forests) can initiate secondary succession.

Detailed explanation-3: -Secondary succession occurs at the site where vegetation or a community was present previously, but it was destroyed due to natural or artificial disturbances such as fire, flood, sudden climatic changes and landslide.