نتایج جستجو برای: shelterwood
تعداد نتایج: 147 فیلتر نتایج به سال:
Forest regenerationmethods such as shelterwood treatments have been shown to substantially increase the diversity of bird species, specifically of species that prefer early seral forests, now rare in the eastern United States. Stand improvement techniques such as thinnings have also been found to increase avian diversity under some conditions. A sustainably managed forest, however, must simulta...
Composition and structure of a three-storied Fagus orientalis-dominated forest was investigated in the Caspian forests, north of Iran. Circular sampling plots of 1000 m2 occupied by advance growth and natural regeneration were randomly chosen where the initial cuttings (with shelterwood aim) were performed. Abundance of species at different growth stages and quality of seedlings and saplings we...
Northern red oak wood is valuable for a variety of applications not only in its natural distribution range North America, but also Europe. Timber quality and stem diameter largely determine timber prices respective uses. Silvicultural management key to influencing tree growth quality. In Germany, crop thinning currently the standard treatment, while Canada shelterwood system common practice. Th...
—In 2001, we initiated a study in Jackson County, AL, to examine shelterwood prescriptions in mixed mesophytic upland hardwood forests located on the escarpment of the mid-Cumberland Plateau. We were particularly interested in testing a shelterwood method that was successfully applied in other upland hardwood systems to recruit Quercus into competitive size classes. In the midstory herbicide sh...
composition and structure of a three-storied fagus orientalis-dominated forest was investigated in the caspian forests, north of iran. circular sampling plots of 1000 m2 occupied by advance growth and natural regeneration were randomly chosen where the initial cuttings (with shelterwood aim) were performed. abundance of species at different growth stages and quality of seedlings and saplings we...
Though longleaf pine (Pinus palustris Mill.) forests have been primarily managed with even-aged methods, interest is increasing in uneven-aged systems, as a means of achieving a wider range of stewardship goals. Selection silviculture has been practiced on a limited scale in longleaf pine, but difficulty with using traditional approaches and absence of an evaluation across a range of site types...
The effect of management was studied on the variation of some crucial forest stand features in the district nine of Shafaroud Gilan during a 20-year period. The survey was conducted in the regeneration affectation on 1985 and 2007. The measurement were done with a similar design (systematic randomized sampling in a 150×200m grid and 0.1 ha circular field plots) in 1985 and 2007, respectively. A...
The effect of initial first-order lateral root (FOLR) groupings of northern red oak (Quercus rubra) seedlings on a high quality mesic site was followed for eleven years on a shelterwood and a clearcut area. The initial FOLR number groups were empirically determined as low (0 to 6) medium (7 to 12) and high ( 12). The shelterwood overstory was removed before the beginning of the eighth growing s...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید