A measure of forest site quality based on the average height (in feet) of the taller (never suppressed) trees of a species at a specified age (usually 50 years for natural stands). A site index of 95 means that the expected height of the tallest trees at an index age of 50 years would be 95 feet on a particular area of land. Site index is usually an approximation in uneven-aged stands because the taller trees were probably overtopped during the regeneration phase. In this publication, the subjective site quality classes for loblolly-shortleaf pines at 50 years are as follows: good sites (85 S.I.), medium sites (65-85 S.I.), and poor sites (65 S.I.).
a measure of site productivity based on site height (metres) at breast height age 50.
an expression of the forest site quality of a stand, at a specified age, based either on the site height, or on the top height, which is a more objective measure.
A designation of the quality of a forest site based on the height of the dominant stand at an arbitrarily chosen age For example, if the average height attained by dominant and codominant trees in a fully stocked stand at the age of 50 years is 75 feet, the site index is 75 feet.
A species-specific measure of actual or potential forest productivity or site quality, expressed in terms of the average height of dominant trees at specific key ages, usually 50 or 100 years.
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.
A relative measure of forest site quality (land productivity) based on the height (in feet) of the dominant trees at a specific age (usually 50 or 25 years).
a measure of the capacity for a given site to grow trees. It usually is a reflection of height growth that can be expected on a given site at some base age. Most commonly, a 50-year base age is used. So, for example, a site index of 100 at base age 50 means that dominant (tallest) and codominant trees of that species will average 100 feet in height after 50 years of growth.
a measure of the quality and potential productivity of a site based on the height of dominant trees at a specified age (usually 50 years), depending on the species.
The expected mean top height of Pinus radiata 20 years from planting. The site index is therefore an indication of site productivity.
A measure of the productivity of a forest site expressed in terms of the height growth attained by trees growing on it. In New Zealand the parameter usually is the Mean Top Height of Pinus radiata at age 20.
the height of a tree at age 50; tree should be one that has consistently been in a dominant position.
An expression of forest site quality based on the height, at a specified age, of dominant and codominant trees in a stand. Indice (de qualité) Index
A measure of the productive quality of an area where trees grow. Site index is based on the height of dominant and co-dominant trees at age 50. That is to say, if the average height of dominant and co-dominant trees on a site was 70 feet at age 50, 70 would be the site index. Graphs are developed to enable determination of site index over a range of tree ages.
A measurement of how productive a forest site is. It is the average height of a dominant or co-dominant tree of a specific species at a specific age (50 years for most species, 100 for some). Theoretically used only on an even-aged forest, this measurement is commonly taken on all forests, and is a very important measurement for the consideration of the management regime to be used.
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.