Final answer:
The average density of tree stems would be greater in early successional forests than in late successional forests due to rapid colonization and growth of tree species. In contrast, late successional forests will have a higher average age and height of trees, accompanied by greater biodiversity.
Step-by-step explanation:
In early successional forests, you can expect the average density of tree stems to be greater than in late successional forests. This is because early successional stages are characterized by rapidly growing species that tend to colonize the area quickly and grow densely. In contrast, late successional stages often have larger, more mature trees that have outcompeted the early colonizers, leading to a decline in stem density as the forest matures. This is supported by studies such as one conducted in the Brazilian Amazon comparing biodiversity in second-growth forests of various ages.
In late successional forests, trees have been growing for a longer time, therefore, the average age of trees would naturally be greater. Additionally, these forests have a more stable ecosystem with a more established community of organisms, leading to greater biodiversity compared to younger forests. The average height of trees in late successional forests would also tend to be greater due to the extended period of growth.