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variable retention造句

例句與造句

  1. Variable retention on the other hand is focused on what is retained
  2. These principles include variable retention regeneration harvest ( clearcutting with retention patches ) in the Oregon Coast Range.
  3. This pilot will demonstrate the professors'ecological principles of variable retention regeneration harvest in the Oregon Coast Range.
  4. Some timber companies have restricted the use of variable retention silviculture to only poorly stocked stands of rare but valuable tree species.
  5. Variable retention harvesting retains more than 15 % of the original stand in both rolling and permanent pockets of untouched trees and refugia patches.
  6. It's difficult to find variable retention in a sentence. 用variable retention造句挺難的
  7. Advances in knowledge and a shift in the balance of objectives towards conservation of biological diversity led to the use of clearcutting with reserves and variable retention systems.
  8. Variable retention is believed by some forestry experts to minimize the impact of logging operation by leaving biological legacies such as coarse woody debris ( nurse logs and snags ).
  9. This year, about half the company's harvest is by " variable retention, " a new sustainable system that relies on thinning or cutting small patches.
  10. Forestry organizations, such as the Forest Stewardship Council ( FSC ), approve of variable retention and are now declaring timber obtained through such a harvesting method as certified wood for green building.
  11. Many logging companies have not maintained a total commitment to phasing out clearcutting and embracing variable retention harvesting, and even MacMillan Bloedel had occasionally fallen short of its commitment to phase out clearcutting.
  12. The use of clearcutting with reserves and variable retention has increased in British Columbia since the late 1990s, and the average size of clearcuts has decreased, improving the balance of environmental and economic objectives.
  13. They required details on management plans for late seral growth ( old-growth ) stands, a more specific schedule for demonstration logging projects and more information on variable retention ( clear-cut ) plans.
  14. Although world markets are beginning to ask for certified wood obtained entirely through variable retention harvesting, it is not yet clear whether the general population of consumers will be willing to pay higher prices for such wood.
  15. Variable retention also aids in emulation of natural disturbances by leaving behind some residual structure from previous stand which is typical for stand replacing disturbances Traditional silviculture systems such as clearcut, patch cut, shelterwood, etc . are focused on maximizing timber production and future regeneration of the trees.
  16. Either few trees or many trees can be retained under the variable retention system, and trees can be retained in patches ( aggregated retention ) or left uniformly throughout a stand ( dispersed retention ); hence the name " variable retention . " It is a technique for retaining trees as key structural elements of a harvested stand for at least until next harvest rotation in an effort to maintain species, habitat diversity and forest-related processes.
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