DENDROLOGY

Detailed explanation-1: -That said, because secondary succession begins with some remnants of the original community, change typically occurs much quicker than in primary succession. Alders, birches, and grasses are common pioneer species in these environments because they thrive in sunny conditions.

Detailed explanation-2: -The secondary succession occurs in a land where there were plants established previously, the seed and the substrate or soil is available. The secondary succession is a gradual process in which the established community is replaced with new habitat moving towards the climax community.

Detailed explanation-3: -In secondary succession on land, such as after a fire or when trees topple in forests, tree species like alders, birches and chir pine and many grass species can begin the succession process. In aquatic environments, phytoplankton (microscopic organisms that photosynthesize) are the common pioneer species.