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describe the life cycle of the loblolly pine
Weegy: Pinus taeda (loblolly pine) is the foundation of the lumber and pulp industry in the Southeast and is found widely planted. Pinus taeda was first described as a species in 1753. [ The scientific name means ìpine used for torches.î Common names include bull pine, oldfield pine, shortleaf pine, Arkansas pine, North Carolina pine, Georgia pine, resin pine, mudhole pine, rosemary pine, frankincense pine, and lob pine. The accepted common name is loblolly pine, which means a ìpine of thick mires and mudholes.î Pinus taeda native range is from south New Jersey along the Atlantic coast and the Piedmont around through central Florida to east Texas, north to southern Kentucky. In Georgia it is found statewide except for the far northeast corner of the state. See the Georgia range map. The growth Hardiness Zone is 6b - 9b and the Heat Zone is 7-10. The lowest number of the Hardiness Zone tends to estimate the northern range limit of the tree and the largest Heat Zone number tends to estimate the southern end of the range. Coder Tree Grow Zone A-E. Pinus taeda grows in a wide range of habitats, forest types and soils. Generally loblolly grows on floodplains, uplands, granite outcrops, wet bottomlands, drier slopes, and on many soil types tending to grow best on deep moist soils. The stem base tends to be buttressed on wet soils. Pinus taeda quickly invades abandoned agricultural land forming either pure or mixed hardwood stands. Pinus taeda is moderately tolerant of shade and competition but grows best where hardwood competition is limited. Loblolly pine has rapid growth, especially when young, and a moderate lifespan (120 years with maximum of 275 years). It is usually found below elevations of 2,000 feet. Pinus taeda grows to a height of 85 - 105 feet with a maximum of 160 feet. Diameter growth is usually between 2-3 feet with a maximum of 5.5 feet. The crown form is broad and rounded with dense foliage. Pinus taeda needles grow in bundles of 3 and ... (More)
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Asked 10/25/2011 8:21:44 AM
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what is the life cycle of the loblolly pine?
Weegy: this study we analyzed the effects of silvicultural treatments on carbon (C) budgets in Pinus taeda L. (loblolly pine) plantations in the southeastern United States. [ We developed a hybrid model that integrated a widely used growth and yield model for loblolly pine with published allometric and biometric equations to simulate in situ C pools. The model used current values of forest product conversion efficiencies and forest product decay rates to calculate ex situ C pools. Using the model to evaluate the effects of silvicultural management systems on C sequestration over a 200 year simulation period, we concluded that site productivity (site quality), which can be altered by silviculture and genetic improvement, was the major factor controlling stand C density. On low productivity sites, average net C stocks were about 35% lower than in stands with the default average site quality; in contrast, on high quality sites, C stocks were about 38% greater than average productivity stands. If woody products were incorporated into the accounting, thinning was C positive because of the larger positive effects on ex situ C storage, rather than smaller reductions on in situ C storage. The use of biological rotation age (18 years) was not suitable for C sequestration, and extended rotation ages were found to increase stand C stock density. Stands with an 18-year-rotation length had 7% lower net C density than stands with a 22-year-rotation length; stands with a 35-year-rotation length had only 4% more C than stands harvested at age 22 years. The C sequestered in woody products was an important pool of C storage, accounting for ~34% of the average net C stock. Changes in decomposition rate, associated with possible environmental changes resulting from global climate change, affected C storage capacity of the forest. When decay rate was reduced to 10% or increased to 20%, the C stock in the dead pool (forest floor and coarse woody debris) was reduced about 11.8 MgC·ha-1 ... (More)
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Asked 10/25/2011 8:27:14 AM
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why did the development of the seed greatly improve the ability of angiosperms and conifers to survive and succeed?
Weegy: Please see check the link: (More)
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Asked 10/25/2011 8:33:05 AM
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Describe the neutral theory of kimura?
Weegy: The neutral theory of molecular evolution states that the vast majority of evolutionary changes at the molecular level are caused by random drift of selectively neutral mutants (not affecting fitness).[1] The theory was introduced by Motoo Kimura in [ the late 1960s and early 1970s, and although it was received by some as an argument against Darwin's theory of evolution by natural selection, Kimura maintained (and most evolutionary biologists agree) that the two theories are compatible.[2] ] (More)
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Asked 10/27/2011 5:14:21 AM
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Describe the neutral theory of kimura?
Weegy: Kimura's neutral theory, first presented in 1968, challenged the notion that natural selection was the sole directive force in evolution. [ Arguing that mutations and random drift account for variations at the level of DNA and amino acids, Kimura advanced a theory of evolutionary change that was strongly challenged at first and that eventually earned the respect and interest of evolutionary biologists throughout the world. This volume includes the seminal papers on the neutral theory, as well as many others that cover such topics as population structure, variable selection intensity, the genetics of quantitative characters, inbreeding systems, and reversibility of changes by random drift. ] (More)
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Asked 10/27/2011 5:09:52 AM
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