Báo cáo lâm nghiệp: "Etude de la régénération naturelle contrôlée en forêt tropicale humide de Guadeloupe" pps
Báo cáo lâm nghiệp: "Dynamics of natural regeneration of even-aged beech (Fagus sylvatica L.) stands at different shelterwood densities" pot
... decomposing layers of litter. e dynamics of the regeneration in plot 2 is a clear evidence of the great effect of parent stand density on the establishment and development of seedlings under ... sufficient fertilization, a relatively open canopy can generate convenient conditions for a large increase of beech seedling growth (M 1995). ere is also a re- lation between different proven...
Ngày tải lên: 07/08/2014, 10:22
Báo cáo lâm nghiệp: "Effect of stand segmentation on growth and development of Norway spruce stands" pps
... also in more distant trees to a certain extent. Enhancement and width of annual ring then decrease being influenced by the position of the tree related to its increasing distance from the skidding ... used to analyze the dependence of investigated variables on the track width. Table 1. Characteristics of group of trees, which grow in rows with different distance from central axis of the c...
Ngày tải lên: 07/08/2014, 03:22
Báo cáo lâm nghiệp: "Growth of hybrid poplars in silviculture at the age of 6 years" pps
... poplar plantations is eff ective despite the necessity of demanding establishment. A successful poplar culture depends on planting of proven clones, good site and intensive cultural treatments. ... evaluated groups of poplars represented hybrids of Populus angula- ta, Populus deltoides, P. nig ra and four clones of P. deltoides. Some authors compared P. deltoides as a parent species wit...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "Forest transport roads according to natural forest regions in the Czech Republi" pps
... management groups as formal instruments of national forest policy. Fundamentals of forest management are recom- mended in Regional Plans of Forest Development. Requirements for Regional Plans ... tractors and special clam skidders. Minimal free width of the road is 3.0 m. Surface may be equipped with operation strengthening, local operation strengthening or without strengthening. Technic...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "Arginine and the shade tolerance of white spruce saplings entering winter dormancy" ppsx
... intensity, amount of growing space and climate were control- led factors throughout sapling development over four years. Shade was maintained in three shelters of lath with fibreglass screening. e ... Arginine and the shade tolerance of white spruce saplings entering winter dormancy D. J. D Department of Plant Sciences, University of California, Davis, USA ABSTRACT: Shade-tolerant...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: " Pinus pumila growth at different altitudes in the Svyatoi Nos Peninsula (Russia)" pps
... R 4 1 Department of Forest Botany, Dendrology and Geobiocoenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic 2 Department of Dendrology and ... of P. pumila generally depends on the intensity of prevailing winds which cause differences in the accumulation of snow in winter. On shaded or poorly insolated locations, P. pumila can cre...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "Effects of artificial damage on the branching pattern of Nothofagus dombeyi (Nothofagaceae)" ppsx
... length and number of nodes of offspring shoots tended to diverge from linearity, and the extents of these divergences depended on the treatment and experiment concerned (Fig. 3). For experiment ... des termes relatifs à la croissance et à la ramification des tiges des végétaux vasculaires, in: Bouchon J., de Reffye P., Barthélémy D. (Eds.), Modélisation et simulation de l’architecture...
Ngày tải lên: 08/08/2014, 00:22
Báo cáo lâm nghiệp: "Genetic inventory of European oak populations: consequences for breeding and gene conservation" pps
... des peu- plements présentant même partiellement l’ensemble de la variabilité génétique de chacune des espèces. Cela devrait mener à une gestion permettant de maintenir en ... Inventaire génétique de populations de chênes européens : conséquences pour la sélection et la conservation de la diversité. L’objectif de la présente étude étai...
Ngày tải lên: 08/08/2014, 18:21
Báo cáo lâm nghiệp: "Effect of ozone article and sulphur dioxide on of Pinus halepensis Miller" pps
... pourcentage de colonisation mycorhizienne. Cependant, ces paramètres ont été significativement réduits lorsque les deux polluants agisaient en combinaison. Des modifications de la morphologie ... ou la mélange de 50 ppb O3 + 40 ppb SO 2. Les traitements O3 et SO 2 n’ont pas eu d’effet significatif sur la masse des tiges et des racines, n...
Ngày tải lên: 08/08/2014, 18:21
Báo cáo lâm nghiệp: "Caractéristiques papetières de la pâte de bois de thuya de Berbérie (Algérie) (Tetraclinis articulata Vahl) obtenue par un procédé soude-anthraquinone" ppsx
... en deux pas- sages avec écartement des disques de 25 centièmes de pouce, puis 10 centièmes de pouce ; – Classage à l’aide d’un appareil Weverk (largeur des fentes = 0.15 mm), en recueillant la ... dif- férence entre les deux types de bois en regard des rendements bruts obtenus et des indices Kappa mesurés sur les deux pâtes (classées). Ce qui permet de conclure, comme le lai...
Ngày tải lên: 07/08/2014, 16:20