What is the purpose of site index curves in forestry?

What is the purpose of site index curves in forestry?

• A. They relate tree height to age to assess site quality.
• B. They predict price of timber.
• C. They measure soil moisture.
• D. They estimate pest risk.

Answer: (A)

Site index curves show how productive a site is for growing a given species by linking height growth to stand age. You measure the height of the dominant trees in a stand at a chosen age, then read the corresponding height at a standard base age from the species curve. The resulting site index reflects site quality: higher values mean a more productive site with greater potential height growth. Foresters use this to compare sites, choose suitable species, and plan rotations and thinning schedules. These curves aren’t used to predict timber prices, measure soil moisture, or assess pest risk.

Site index curves show how productive a site is for growing a given species by linking height growth to stand age. You measure the height of the dominant trees in a stand at a chosen age, then read the corresponding height at a standard base age from the species curve. The resulting site index reflects site quality: higher values mean a more productive site with greater potential height growth. Foresters use this to compare sites, choose suitable species, and plan rotations and thinning schedules. These curves aren’t used to predict timber prices, measure soil moisture, or assess pest risk.