What is even-aged and uneven-aged forest management?
Based on the range of ages among the different levels of structure, forest stands are defined as even-aged, two-aged or uneven-aged. Even-aged structure means a stand has one distinct age and size class. Uneven-aged structure means a stand has three or more age classes.
What is the difference between even-aged and uneven-aged stands?
Large-scale natural disturbances, such as wildfire, have naturally favoured even-aged stands of seral species with a niche closely associated with these disturbance types. An uneven-aged stand is a mosaic of tiny even-aged clumps and scattered individuals woven together through a perpetual cycle of random disturbances.
What are the factors for the stands qualify for uneven-aged management?
The three basic decision parameters in uneven-aged management that we will consider are 1) the target diameter distribution, 2) the cutting cycle, and 3) individual tree harvesting decisions.
What is even-aged system?
By definition, an even-aged stand is one in which the trees are within 20 percent of a given age, relative to the rotation length. Rotation length is the period of time that forest trees are grown before they are cut and a new regeneration cycle starts.
What is seed tree method?
Main definition. seed tree method. A silviculture system whereby the entire stand is removed in a final cutting except for selected single seed trees in small groups to provide the seed for reproduction.
What are the effects of even-aged and uneven-aged forest management on boreal forest biodiversity in fennoscandia and European Russia?
Results showed that forests with less disturbance (uneven-aged and mature even-aged) host more forest dependent species than young even-aged forests (< 80 years old) although the difference was only marginally significant for mature even-aged forests (> 80 years old).
What is coppice forest?
Coppice is a word that is used by foresters to cover many things including: a type of woodland consisting of trees that are periodically cut; the multistemmed trees that occur in such woodlands; the process of felling the trees; and the production of new shoots by recently cut stools.
Where is even-aged management used?
Even-aged timber management is a group of forest management practices employed to achieve a nearly coeval cohort group of forest trees. The practice of even-aged management is often pursued to minimize costs to loggers.
What is Q factor in forestry?
The q-factor is the ratio of the number of trees in a diameter class divided by the number of trees in the next smaller diameter class. The lower the q-factor, the higher the proportion of large diameter trees.
What is irregular forest?
B. Abnormal Forest: Abnormal forest is one which is not normal, i.e. growing stock, age, class, distribution of stems, increment, etc. are either in excess or more usually in dificit than the normal forest.
What is regenerative forestry?
Forest regeneration is the process by which new tree seedlings become established after forest trees have been harvested or have died from fire, insects, or disease. Regeneration is key to sustainable forestry and can be accomplished through two basic approaches: Allowing a forest to regenerate is crucial.
What is clear-cutting a forest?
Clearcutting is a method of timber harvest. It involves cutting all the trees in an area at one time. 2. Clearcutting is used as a method of regenerating or rejuvenating certain kinds of trees that cannot tolerate shade.