|
Thinning
In agricultural sciences, thinning is the removal of some plants, or parts of plants, to make room for the growth of others. Selective removal of parts of a plant such as branches, buds, or roots is typically known as '' pruning''. In forestry, thinning is the selective removal of trees, primarily undertaken to improve the growth rate or health of the remaining trees. Overcrowded trees are under competitive stress from their neighbors. Thinning may be done to increase the resistance of the stand to environmental stress such as drought, insect infestation, extreme temperature, or wildfire. In forestry Tree thinning may be practised in forestry to make a stand more profitable in an upcoming final felling, or to advance ecological goals such as increasing biodiversity or accelerating the development of desired structural attributes such as large diameter trees with long tree crowns. Early thinning, e.g. after 20 years, rather than late thinning, e.g. after 50 years, has dif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecological Thinning
Ecological thinning is a silvicultural technique used in forest management that involves cutting trees to improve functions of a forest other than timber production. Although thinning originated as a man-made forest management tool, aimed at increasing timber yields, the shift from production forests to multifunctional forests brought with it the cutting of trees to manipulate an ecosystem for various reasons, ranging from removing non-native species from a plot to removing poplars growing on a riverside beach aimed at recreational use. Since the 1970s, leaving the thinned trees on the forest floor has become an increasingly common policy: wood can be decomposed in a more natural fashion, playing an important role in increasing biodiversity by providing habitat to various invertebrates, birds and small mammals. Many fungi (e.g. '' Calocera viscosa'') and mosses are saproxylic or epixylic as well (e.g. ''Marchantiophyta'') – some moss species completing their entire life-cyc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pruning
Pruning is the selective removal of certain parts of a plant, such as branches, buds, or roots. It is practiced in horticulture (especially fruit tree pruning), arboriculture, and silviculture. The practice entails the targeted removal of diseased, damaged, dead, non-productive, structurally unsound, or otherwise unwanted plant material from crop and landscape plants. In general, the smaller the branch that is cut, the easier it is for a woody plant to compartmentalize the wound and thus limit the potential for pathogen intrusion and decay. It is therefore preferable to make any necessary formative structural pruning cuts to young plants, rather than removing large, poorly placed branches from mature plants. Woody plants may undergo a process referred to as ''self-pruning'', where they will drop twigs or branches which are no longer producing more energy than they require. It is theorized that this process can also occur in response to lack of water, in order to reduce the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wildfire
A wildfire, forest fire, or a bushfire is an unplanned and uncontrolled fire in an area of Combustibility and flammability, combustible vegetation. Depending on the type of vegetation present, a wildfire may be more specifically identified as a bushfire (Bushfires in Australia, in Australia), desert fire, grass fire, hill fire, Peat#Peat fires, peat fire, prairie fire, vegetation fire, or veld fire. Some natural forest ecosystems Fire ecology, depend on wildfire. Modern forest management often engages in prescribed burns to mitigate fire risk and promote natural forest cycles. However, controlled burns can turn into wildfires by mistake. Wildfires can be classified by cause of ignition, physical properties, combustible material present, and the effect of weather on the fire. Wildfire severity results from a combination of factors such as available fuels, physical setting, and weather. Climatic cycles with wet periods that create substantial fuels, followed by drought and heat, of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clearcutting
Clearcutting, clearfelling or clearcut logging is a forestry/logging practice in which most or all trees in an area are uniformly cut down. Along with Shelterwood cutting, shelterwood and Seed tree, seed tree harvests, it is used by foresters to create certain types of forest ecosystems and to promote select species that require an abundance of sunlight or grow in large, even-age stand level modelling, stands. Clearcutting is a forestry practice that mimics the stand initiation stage of forest succession after a natural disturbance such as Wildfire, stand replacing fire or Windthrow, wind-throw, and is successful for regeneration of fast growing, Douglas fir, sun tolerant tree species and wildlife species that readily regenerate in post-stand replacing sites. Logging companies and forest-worker unions in some countries support the practice for scientific, safety and economic reasons, while detractors consider it a form of deforestation that habitat destruction, destroys natural h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forestry
Forestry is the science and craft of creating, managing, planting, using, conserving and repairing forests and woodlands for associated resources for human and Natural environment, environmental benefits. Forestry is practiced in plantations and natural Stand level modelling, stands. The science of forestry has elements that belong to the biological, physical, social, political and managerial sciences. Forest management plays an essential role in the creation and modification of habitats and affects ecosystem services provisioning. Modern forestry generally embraces a broad range of concerns, in what is known as multiple-use management, including: the provision of timber, fuel wood, wildlife habitat, natural Water resources, water quality management, recreation, landscape and community protection, employment, aesthetically appealing landscapes, biodiversity management, watershed management, erosion control, and preserving forests as "Carbon dioxide sink, sinks" for Earth's atmosp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Site Index
Site index is a term used in forestry to describe the potential for forest trees to grow at a particular location or "site". Site is defined as "The average age of dominate and/or codominate trees of an even-aged, undisturbed site of intolerant trees at a base age"; furthermore, the word site is used in forestry to refer to a distinct area where trees are found. Site index is used to measure the productivity of the site and the management options for that site and reports the height of dominant and co-dominant trees in a stand at a base age such as 25, 50 and 100 years. For example, a red oak with an age of 50 years and a height of will have a site index of 70. Site index is species specific. Common methods used to determine site index are based on tree height, plant composition and the use of soil maps. Determining site index The most common of the methods used to determine site index is tree height. Determining site index is achieved by measuring and averaging the total heigh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clearcutting
Clearcutting, clearfelling or clearcut logging is a forestry/logging practice in which most or all trees in an area are uniformly cut down. Along with Shelterwood cutting, shelterwood and Seed tree, seed tree harvests, it is used by foresters to create certain types of forest ecosystems and to promote select species that require an abundance of sunlight or grow in large, even-age stand level modelling, stands. Clearcutting is a forestry practice that mimics the stand initiation stage of forest succession after a natural disturbance such as Wildfire, stand replacing fire or Windthrow, wind-throw, and is successful for regeneration of fast growing, Douglas fir, sun tolerant tree species and wildlife species that readily regenerate in post-stand replacing sites. Logging companies and forest-worker unions in some countries support the practice for scientific, safety and economic reasons, while detractors consider it a form of deforestation that habitat destruction, destroys natural h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abans D'aclarirPICT1233-horz
Abans PLC also known as Abans Group is a Sri Lankan public limited company and a diversified conglomerate in Sri Lanka engaged in ICT, retail, manufacturing, logistics, commercial real estate and financial services. Abans predominantly functions mainly as a consumer retailer selling various electronic appliances, smart phones, laptops, cooking utensils. Aban Pestonjee is the founder of the Abans Group of companies and serves as the chairperson of the company. Corporate history Aban Pestonjee launched her business under the name Abans in 1968 at her home garage, where she managed to restore the used appliances she acquired from auctions and home sales to better working condition and sell them at her corner shop at Bambalapitiya, Galle Road. She came up with the idea to launch her own company at a time when Sri Lanka entered into the prospect of a closed economy in the 1960s, which also resulted in the subsequent ban on imports. Aban also took note of how difficult it was to com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slash Pine
''Pinus elliottii'', commonly known as slash pine,Family, P. P. (1990). Pinus elliottii Engelm. slash pine. ''Silvics of North America: Conifers'', (654), 338. is a Pinophyta, conifer tree native to the Southeastern United States. Slash pine is named after the "slashes" – swampy ground overgrown with trees and bushes – that constitute its habitat. Other common names include swamp pine, yellow slash pine, and southern Florida pine. Slash pine has two different varieties: ''P. e.'' var. ''elliottii'' and ''P. e.'' var. ''densa''. Historically, slash pine has been an important economic timber for naval stores, turpentine, and resin. The wood of slash pine is known for its unusually high strength, especially for a pine. It exceeds many hardwoods and is even comparable to very dense woods such as Krugiodendron, black ironwood. Description and taxonomy This tree is fast-growing, but not very long-lived by pine standards (to 200 years). It reaches heights of with a trunk diameter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stand Level Modelling
A forest stand is a contiguous Plant community, community of trees sufficiently uniform in composition, structure, Forest inventory#Timber metrics, age, size, class, distribution, spatial arrangement, condition, or location on a Site quality (forestry), site of uniform quality to distinguish it from adjacent communities. A forest is a "collection of stands" also utilizing the practices of forestry. Stand level modelling is a type of modelling in the forest sciences in which the main unit is a forested stand. Stand description A forest stand is commonly described as in 10ths or 10%s. Thus a ratio could be given of: 3 Ponderosa pines, 2 mangrove trees, 5 silver spruces. If there was a mixed stand that stand mix could be described as mixed up to 10%, mixed 10–40% and a mixed stand over that amount. The form of mixing of the tree types is commonly given as: * individuals – when there are a few unconnected trees of a type. * troop – up to 5 trees connected of one type. * grou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crown (botany)
The crown of a plant is the total of an individual plant's aboveground parts, including stems, leaves, and reproductive structures. A plant community canopy consists of one or more plant crowns growing in a given area. The crown of a woody plant (tree, shrub, liana) is the branches, leaves, and reproductive structures extending from the trunk or main stems. Shapes of crowns are highly variable. The major types for trees are the excurrent branching habit resulting in conoid shapes and decurrent (deliquescent) branching habit, resulting in round shapes. Crowns are also characterized by their width, depth, surface area, volume, and density. Measurements of crowns are important in quantifying and qualifying plant health, growth stage, and efficiency. Major functions of the crown include light energy assimilation, carbon dioxide absorption and release of oxygen via photosynthesis, energy release by respiration, and movement of water to the atmosphere by transpiration. These f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Hemlock
''Tsuga heterophylla'', the western hemlock or western hemlock-spruce, is a species of hemlock native to the northwest coast of North America, with its northwestern limit on the Kenai Peninsula, Alaska, and its southeastern limit in northern Sonoma County, California.Farjon, A. (1990). ''Pinaceae. Drawings and Descriptions of the Genera''. Koeltz Scientific Books .Gymnosperm Database''Tsuga heterophylla'' The Latin species name means 'variable leaves'. Description Western hemlock is a large evergreen conifer growing to tall, exceptionally ,Tallest Hemlock, M. D. Vaden, Arborist''Tallest known Hemlock, Tsuga heterophylla''/ref> and with a trunk diameter of up to . It is the largest species of hemlock, with the next largest ( mountain hemlock) reaching a maximum height of . The bark is brown, thin, and furrowed (outwardly appearing similar to that of Douglas-fir). The crown is a very neat broad conic shape in young trees with a strongly drooping lead shoot, and becomes cylindr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
