What site index value indicates a good site in upland hardwoods in Illinois?

What site index value indicates a good site in upland hardwoods in Illinois?

• A. 75 or higher.
• B. 60 or higher.
• C. 80 or higher.
• D. 70 or higher.

Answer: (A)

Site index is a measure of how productive a site is, expressed as the height (in feet) of the dominant trees at a standard base age (usually 50 years). It lets us compare sites without worrying about how old the stand is. In Illinois upland hardwoods, a value of 75 or higher indicates a good site. That means the best trees on that site would reach about 75 feet tall (or more) by the base age, signaling strong growth potential and typically good timber yield. Values below 75 show progressively lower growth potential. So the threshold for calling a site good is 75 or higher.

Site index is a measure of how productive a site is, expressed as the height (in feet) of the dominant trees at a standard base age (usually 50 years). It lets us compare sites without worrying about how old the stand is.

In Illinois upland hardwoods, a value of 75 or higher indicates a good site. That means the best trees on that site would reach about 75 feet tall (or more) by the base age, signaling strong growth potential and typically good timber yield. Values below 75 show progressively lower growth potential. So the threshold for calling a site good is 75 or higher.