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The leaves of both species are similar in outline and toothed and bristled very much the same way, but the leaves are brighter in the American holly and larger. [citation needed] The American holly, called the evergreen or Christmas holly (Ilex opaca Aiton) was named the state tree of Delaware on 1 May 1939. [19]
The mean annual increment (MAI) or mean annual growth refers to the average growth per year a tree or stand of trees has exhibited/experienced up to a specified age. For example, a 20-year-old tree that has a stem volume of 0.2 m 3 has an MAI of 0.01 m 3 /year.
PAI may go negative if a tree loses volume due to damage or disease. Periodic annual increment is commonly used instead of current annual increment as a basis for computing growth per cent. Growth per cent indicates the rate of increase with relation to the wood capital required for its production, this is usually based on a single year's ...
American holly: Ilex opaca: 1939 [12] District of Columbia: Scarlet oak: Quercus coccinea: 1960 [13] Florida: Sabal palm: Sabal palmetto: 1953 [14] Georgia: Southern live oak: Quercus virginiana: 1937 [15] [16] Guam: Ifit (Pacific teak) Intsia bijuga: 1969 [17] Hawaii: Candlenut tree (kukui) Aleurites moluccanus: 1959 [18] Idaho: Western white ...
By contrast, the (roughly) 300-year-old Ice Glen pine in Stockbridge, Massachusetts shows approximately half the annual growth rate of trees in the 90- to 180-year age range, averaging just 5.8 cubic feet (0.16 m 3) per year over a five-year monitoring period. Volume increased as a result of increases in both height and girth.
The equation for exponential mass growth rate in plant growth analysis is often expressed as: = Where: M(t) is the final mass of the plant at time (t). M 0 is the initial mass of the plant. RGR is the relative growth rate. RGR can then be written as:
A well-known allometric equation relates metabolic rate to body mass: Y = βM 3/4. In forestry the equation takes on many forms in order to represent relationships between the many various attributes of tree size and growth. Below is an example:
Height growth for the first 15 years averages 0.6 metres per year (2.0 feet per year), with a 10-year-old tree averaging 6.5 m (21 ft) in height. These figures do not compare with the seedling's growth figures because growth and yield measurements were made on stems that were most probably sprouts.