
Site index is a term used in forestry to describe the potential for forest trees to grow at a particular location or `site.` Site is defined as `The average age of dominate and/or codominate trees of a even-aged, undisturbed site of intolerant trees at a base age”; furthermore, the word site is used in forestry to refer to a distinct area wh...
Found on
http://en.wikipedia.org/wiki/Site_index

a measure of the quality of a site based on the height of dominate trees at a specified age (usually 25 or 50 years), depending on the species.
Found on
https://www.encyclo.co.uk/local/22458

A relative measure of forest site quality based on the height (in feet) of the dominant trees at a specific age (usually 25 or 50 years, depending on rotation length). Site index information helps estimate future returns and land productivity for timber and wildlife.
Found on
https://www.ncforestry.org/teachers/glossary-of-forestry-terms/
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