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A pine is any conifer tree or shrub in the genus Pinus of the family Pinaceae. Pinus is the sole genus in the subfamily Pinoideae.
The Douglas fir is an evergreen conifer species in the pine family, Pinaceae. It is native to western North America and is also known as Douglas-fir, Douglas spruce, Oregon pine, and Columbian pine. There are three varieties: coast Douglas-fir, Rocky Mountain Douglas-fir and Mexican Douglas-fir.
Pine nuts, also called piñón, pinoli, or pignoli, are the edible seeds of pines. According to the Food and Agriculture Organization, only 29 species provide edible nuts, while 20 are traded locally or internationally owing to their seed size being large enough to be worth harvesting; in other pines, the seeds are also edible but are too small to be of notable value as human food. The biggest producers of pine nuts are China, Russia, North Korea, Pakistan and Afghanistan.
Pinus radiata, the Monterey pine, insignis pine or radiata pine, is a species of pine native to the Central Coast of California and Mexico. It is an evergreen conifer in the family Pinaceae.
The pinyon or piñon pine group grows in southwestern North America, especially in New Mexico, Colorado, Arizona, and Utah. The trees yield edible nuts, which are a staple food of Native Americans, and widely eaten as a snack and as an ingredient in New Mexican cuisine. The name comes from the Spanish pino piñonero, a name used for both the American varieties and the stone pine common in Spain, which also produces edible nuts typical of Mediterranean cuisine. Harvesting techniques of the prehistoric American Indians are still used today to collect the pinyon seeds for personal use or for commercialization. The pinyon nut or seed is high in fats and calories. In the western United States, pinyon pines are often found in pinyon–juniper woodlands.
Pinus strobiformis, commonly known as southwestern white pine, Mexican white pine or Chihuahua white pine, is a medium-sized white pine tree whose native habitat is in southwestern United States and Mexico. It is typically a high-elevation pine growing mixed with other conifers.
Pinus cembroides, also known as pinyon pine, Mexican pinyon, Mexican nut pine, and Mexican stone pine, is a pine in the pinyon pine group, native to western North America. It grows in areas with low levels of rainfall and its range extends southwards from Arizona, Texas and New Mexico in the United States into Mexico. It typically grows at altitudes between 1,600 and 2,400 metres. It is a small pine growing to about 20 m (66 ft) with a trunk diameter of up to 50 cm (20 in). The seeds are large and form part of the diet of the Mexican jay and Abert's squirrel. They are also collected for human consumption, being the most widely used pine nut in Mexico. This is a common pine with a wide range and the International Union for Conservation of Nature has rated its conservation status as being of "least concern".
Pinus edulis, the Colorado pinyon, two-needle piñon, pinyon pine, or simply piñon, is a pine in the pinyon pine group native to the Southwestern United States, used for its edible pine nuts.
Pinus monophylla, the single-leaf pinyon, is a pine in the pinyon pine group, native to North America. The range is in southernmost Idaho, western Utah, Arizona, southwest New Mexico, Nevada, eastern and southern California and northern Baja California.
El Coahuilón is a mountain located in the municipalities of Arteaga; Coahuila and Rayones; Nuevo León, Mexico; to the northeast of the town Mesa de las Tablas. The mountain is part of the Sierra Madre Oriental. Its altitude is 3,575 meters above sea level, it is the third highest mountain in Coahuila, after Cerro de la Viga and Sierra de la Marta.
Christmas tree production occurs worldwide on Christmas tree farms, in artificial tree factories and from native strands of pine and fir trees. Christmas trees, pine and fir trees purposely grown for use as a Christmas tree, are grown on plantations in many western nations, including Australia, the United Kingdom and the United States. In Australia, the industry is relatively new, and nations such as the United States, Germany and Canada are among world leaders in annual production.
Christmas tree cultivation is an agricultural, forestry, and horticultural occupation which involves growing pine, spruce, and fir trees specifically for use as Christmas trees.
Pine and fir trees, grown purposely for use as Christmas trees, are vulnerable to a wide variety of pests, weeds and diseases. Many of the conifer species cultivated face infestations and death from such pests as the balsam woolly adelgid and other adelgids. Aphids are another common insect pest. Christmas trees are also vulnerable to fungal pathogens and their resultant illnesses such as root rot, and, in the U.S. state of California, sudden oak death. Douglas-fir trees in particular are vulnerable to infections from plant pathogens such as R. pseudotsugae.
While the first Christmas tree farm may have appeared as early as 1901, Christmas tree production in the United States was largely limited to what could be harvested from natural forests until the 1950s. Among the important Christmas tree producing areas in the U.S. are Wisconsin, North Carolina, Pennsylvania and the Pacific Northwest. In 2002 Christmas tree production in the United States totaled 20.8 million trees and the U.S. was one of the world's leading producers of natural Christmas trees. That same year, Pennsylvania was the top producer in the United States.
Christmas tree production in Canada totals from 3 to 6 million trees annually. Trees are produced in many of the provinces of Canada but the nation's leading producers are found in Quebec, Nova Scotia and Ontario, which account for 80 percent of Canadian tree production. Of the 900,000 trees produced annually in British Columbia, most are cut from native pine stands.
Mexican conifers extend mainly across the main mountain ranges Sierra Madre Oriental, Sierra Madre Occidental and the Trans-Mexican Volcanic Belt. Enclosed between these mountains there are dispersed groups of conifers in mid and high elevations valleys when rainfall conditions allow their growth. Mexican conifers grow in some places often associated with oaks.
The Propagation of Christmas trees is the series of procedures carried out to grow new Christmas trees.
The Pine–oak Forest of Puebla covers the mass of pine and oak forests in the Mexican state of Puebla.
A tree plantation, forest plantation, plantation forest, timber plantation or tree farm is a forest planted for high volume production of wood, usually by planting one type of tree as a monoculture forest. The term tree farm also is used to refer to tree nurseries and Christmas tree farms. Plantation forestry can produce a high volume of wood in a short period of time. Plantations are grown by state forestry authorities and/or the paper and wood industries and other private landowners. Christmas trees are often grown on plantations, and in southern and southeastern Asia, teak plantations have recently replaced the natural forest.
Both naturally and artificially occurring pine species (Pinus) can hybridize, combining their genetic material and sometimes creating hybrids that can be more or less vigorous than their parent species. An example of a naturally occurring hybrid pine is Pinus × sondereggeri, a naturally occurring cross between loblolly pine and longleaf pine. An example of the many artificial hybrids is Pinus lambertiana × P. armandii.
References
- 1 2 3 4 5 6 7 8 9 10 11 Lehrer, Michael. "Mexico - Product Brief - Christmas Trees - 2004 Archived 2012-09-11 at the Wayback Machine ", USDA Foreign Agriculture Service, GAIN Report - Gain Report No: MX4312, August 25, 2004, accessed September 23, 2012.
- 1 2 3 4 5 Flores, Dulce. "Mexico - Christmas Trees [ permanent dead link ]", USDA Foreign Agriculture Service, GAIN Report - Gain Report No: MX1040, May 12, 2011, accessed September 23, 2012.