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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.
Christmas tree cultivation is an agricultural, forestry, and horticultural occupation which involves growing pine, spruce, and fir trees specifically for use as Christmas trees. The first Christmas tree farm was established in 1901, but most consumers continued to obtain their trees from forests until the 1930s and 1940s. Christmas tree farming ...
They assist landowners with species identification and management of existing community forests with the main goal of creating healthy functional ecosystems within residential communities. Urban and community forestry programs are not only limited to trees and shrubs but also to the factors that contribute to the growth of these organisms.
Where: Y is the yield (volume, height, DBH, etc.) at times 1 and 2 and T 1 represents the year starting the growth period, and T 2 is the end year. Example: Say that the growth period is from age 5 to age 10, and the yield (height of the tree), is 14 feet at the beginning of the period and 34 feet at the end.
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Pinaceae: pine family; Pinus: pines; Pinus arizonica var. stormiae: Arizona pine Pinaceae (pine family) Yes IUCN (LC) Pinus cembroides: Mexican pinyon pine Pinaceae (pine family) Yes Yes Yes IUCN (LC) 140 Pinus echinata: shortleaf pine Pinaceae (pine family) Yes Yes Yes IUCN (LC) 110 Pinus edulis: pinyon pine Pinaceae (pine family) Yes Yes Yes ...
Old growth longleaf pine stand, scorched by fire (top); longleaf pine stand after timber removal (bottom) Before European settlement, longleaf pine forest dominated as much as 90,000,000 acres (360,000 km 2) stretching from Virginia south to Florida and west to East Texas. Its range was defined by the frequent widespread fires that were lit by ...
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.
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