Báo cáo lâm nghiệp: "Successful under-planting of red oak and black cherry in early-successional deciduous shelterwoods of North America" ppsx

... early-successional forest stands with red oak and black cherry was tested as a way of improving productivity on abandoned agricultural land of North American temperate deciduous forests. A partial ... associated with increased growth of black cherry. Both height and diame- ter growth were increased, pointing to an increase in available light at the top of the se...

Ngày tải lên: 07/08/2014, 16:20

... containing 30 seedlings per stocklot in a row plot (n = 90 seedlings per stocklot and per site). Site preparation (removal of pre- existing natural vegetation and 30 × 30 × 30 cm hole openings) and planting ... differences in the growth chamber RGP, with a peak in December (between 7 to 12 new roots longer than one cm) and very low values in November and January for seedlin...

Ngày tải lên: 07/08/2014, 16:21

... mathematically defined and applied to all measured objects, these transformations deliver the coordinates of each measured point in the coordinate system in which the standing tree was measured. These data ... expressed in the global coordinate system, all coordinates of the measured points in the local coordinate system can be obtained in the global coordinate system. ANNEX...

Ngày tải lên: 08/08/2014, 01:21

... become increasingly limited, and thus unable to maintain sustained growth. In direct comparison the initial rate of growth of the trees in the weedy control was lower. However, the rate of decline was ... Forestry Industry, and in particular the field staff of the Mtunzini Plantation for their assistance in the implemen- tation, maintenance and felling of the trial. Dr...

Ngày tải lên: 08/08/2014, 01:21

... number of inoculation points, as a large increase of blue stain- ing was observed in the sapwood with an increasing amount of inoculation points, at a density of 400 m -2 . ... M.P., The formation of dry zones in the sapwood of conifers. I. Induction of drying in standing trees and logs by Fomes annosus and extracts of infected w...

Ngày tải lên: 09/08/2014, 04:20

... values of the density of forest transport roads in single morphological types of terrain: in lowlands and ta- blelands with the slope of terrain to 15% 15 m/ha by obtainable efficiency 90% and average ... opening and optimal skidding distance through various technologies of timber skidding. In current practices the opening of forests and forest complexes is realize...

Ngày tải lên: 07/08/2014, 10:21

... covering the most important regions for oak forest management in the Czech Republic. At each site, 8–9 trees were measured in standing position and thereafter measured again after felling and ... Table 2. Stand characteristics of a generated test stand exemplifying the typical management of oak; mean stand height, basal area and stocking density (N) are shown for each st...

Ngày tải lên: 07/08/2014, 10:21

... factors and the increment in growth [66] this increment is of considerable importance since it points to an increased rate of sequestering of CO 2 in the biosphere [28]. In the European Alps and, ... new reduction of grazing intensity and in most of the trees established in the first decades of the 20th century the apex exceeded the brows- ing height and the trees...

Ngày tải lên: 07/08/2014, 16:20

... Tasmania. Subrace Locality Number of families Number of individuals Flinders Island, Tasmania Central Flinders Island 4 18 King Island, Tasmania South King Island 5 27 North- eastern Tasmania North- east Tasmania ... Assessment of pulp yield and lignin content in a first-generation clonal testing of Eucalyptus globulus in Portugal, in: Proceedings of the IUFRO Conference on...

Ngày tải lên: 07/08/2014, 16:20

... G., Inter-regional variability in site index models for even-aged stands of stone pine (Pinus pinea L.) in Spain, Ann. For. Sci. 60 (2003) 259–269. [11] Cao Q.V., Estimating coefficients of base-age ... one of the most efficient ways of ascertaining the overall picture of model performance is by visual inspection, so graphical analyses consisting of plots of observed against...

Ngày tải lên: 08/08/2014, 00:21