Which of the following is NOT typically included in a natural resource inventory?

In the context of a natural resource inventory, planting costs are generally not considered a component of the inventory itself. A natural resource inventory focuses on the assessment and documentation of the existing conditions and characteristics of a resource area. This includes stand density, which refers to the number of trees or plants per unit area; species composition, which details the types of species present and their relative abundances; and age distribution, which provides insight into the demographic structure of the population, indicating the different ages of the trees or plants present.

Planting costs, however, relate to the financial aspect of establishing a forest or planting program rather than the current condition of the natural resource at hand. Therefore, these costs do not provide information about the biological or ecological characteristics of the area being surveyed, making them irrelevant to a natural resource inventory.