نتایج جستجو برای: shelterwood
تعداد نتایج: 147 فیلتر نتایج به سال:
Standing dead trees (snags) are an important component of forest ecosystems, providing foraging, nesting, and roosting substrate for a variety of vertebrates. We examined the effects of four forest regeneration treatments on residual snag density and compared those with densities found in unharvested, naturally regenerated forests (controls) during the second, fourth, and sixth year after timbe...
Understanding differences in physiological and growth strategies in low-light environments among upland oak species may help managers address the challenges of oaks’ poor regeneration. Gas exchange and chlorophyll content were measured for northern red oak (Quercus rubra L.), chestnut oak (Quercus prinus L.), and white oak (Quercus alba L.) germinants grown at 25%, 18%, and 6% of full sun in on...
T his Special Issue of the Journal of Forestry presents the Proceedings of the 2015 National Silviculture Workshop (NSW), which was held as one of the concurrent sessions of the 2015 National Society of American Foresters (SAF) Convention in Baton Rouge, Louisiana. Sponsors for the session included the D-2 Silviculture Working Group and two US Department of Agriculture Forest Service Washington...
Resource sustainability requires a thorough understanding of the influence of forest management programs on the conservation of genetic diversity in tree populations. To observe how differences in forest structure affect the genetic structure of eastern white pine (Pinus strobus L.), we evaluated six eastern white pine sites across the 234 000 acre (1 acre = 0.4046856 ha) Menominee Indian Reser...
Global mean temperature over 1998 to 2015 increased at a slower rate (0.1 K decade) compared with the ensemble mean (forced) warming rate projected by Coupled Model Intercomparison Project 5 (CMIP5) models (0.2 K decade). Here we investigate the prospects for this slower rate to persist for a decade or more. The slower rate could persist if the transient climate response is overestimated by CMI...
Northern’ red oak (Quercus rubra L.) (NRO) and white oak (0. alba L.) (WO) acorns were sown into wooden plots and grown under 30 percent shade screen (30 percent S) or 70 percent shade screen (70 percent S). Seedlings grown under full sun were the controls (C). At the end of the first year, the 30 percent S NRO had 30 percent greater seedling dry weight (DW) than C seedlings. No growth differen...
Mortality was recorded annually over a 15-year period after thinning in each of three evenaged stands (one ponderosa pine and two ponderosa pine/Douglas-fir/western larch), and after individual tree selection cutting in two uneven-aged ponderosa pine stands. Highest mortality occurred in the controls in both the evenand uneven-aged stands, primarily due to suppression, while weather was the lea...
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