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Unlike the closely related western red cedar (Thuja plicata), northern white cedar is only a small or medium-sized tree, growing to a height of 15 m (49 ft) tall with a 0.9 m (3.0 ft) trunk diameter, exceptionally to 38 metres (125 ft) tall and 1.8 metres (5.9 ft) diameter. [7] The tree is often stunted or prostrate in less favorable locations.
Melia azedarach, commonly known as the chinaberry tree, [3] pride of India, [4] bead-tree, Cape lilac, [3] syringa berrytree, [3] Persian lilac, [3] Indian lilac, or white cedar, [5] is a species of deciduous tree in the mahogany family, Meliaceae, that is native to Indomalaya and Australasia.
[2] [3] [7] [8] The tree begins bearing seeds at 4–5 years, but does not reach full maturity and start producing cones until it is 10-20 years old. Seeds are dispersed nearly every year and travel by wind. [11] Height and diameter of the tree increase steadily until the tree is 50 years old, at which point height growth slows.
In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2] Tree volumes and weights are not directly measured in the field, but computed from other variables that can be measured. [3] [4]
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When stocking, a tree's basal area is measured. The basal area is a cross-sectional area of the stump taken about 4.5 feet (1.4 m) above the ground. [7] The equation for calculating the basal area of trees in a stand is Basal Area = 0.005454 DBH 2, where DBH is the diameter of the tree at the aforementioned measuring height. [7]
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 oldest known tree is a Great Basin bristlecone pine, Pinus longaeva, growing in the White Mountains of eastern California. The tree was cored by Edmund Schulman in the late 1950s, but was never dated. Recently Tom Harlan completed the dating of the old core sample. The tree is still alive and is 5062 years old as of the 2012 growing season ...