Which of the following is a suitable buffer zone for protecting a mature tree?

The concept of a buffer zone is crucial for protecting mature trees during construction or other activities that could harm their root systems and overall health. The recommendation of one foot per inch of diameter at breast height (DBH) as a suitable buffer zone aligns with best practices in arboriculture.

This guideline is based on the understanding that the root zone of a tree typically extends well beyond its canopy. The diameter at breast height serves as a measurable standard that reflects the size and potential root area of the tree. By establishing a buffer zone of one foot for each inch of DBH, it ensures that a significant portion of the tree's rooting space is preserved. This is vital for maintaining the tree's access to water, nutrients, and structural integrity.

In contrast, other options may not account for the necessary spatial requirements of the tree's root system. For instance, having only five feet around the trunk might not provide adequate protection for larger trees with substantial root zones, while the inch-per-inch measurements (one inch or two inches) do not sufficiently recognize the extensive area required for mature trees' roots. Therefore, one foot per inch of DBH is considered the most effective approach to protect the tree from potential disturbances and ensure its long-term health.