Site Productivity Estimates British Columbia foresters evaluate site productivity with site index, which is the height of site trees at breast height age 50.
Site index is used in a variety of ways, such as in formulating silviculture prescriptions.
It is also one of the most important parameters in estimating forest stand growth and yield. These growth and yield estimates are subsequently used in timber supply analyses, and hence play an important role in determining the allowable annual cut. The last round of the timber supply review revealed that many of our site index estimates are poor. Generally, we have been underestimating site index. Poor selection of proper site trees.