Báo cáo lâm nghiệp: "Analysis of some dynamic series of forest production and trends of forest economics in the Czech Republic" ppt

... m3/ha (according to Report on the Condition of Forests and Forestry in the Czech Republic, 2004).Timber felling In the whole post-war period, annual timber fell-ing in the forestry of Czech Republic ... some dynamic series of forest production and trends of forest economics in the Czech RepublicV. KFaculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry Brno, ... each other – both with respect to the development of commercial forest production and in terms of the implementation of the strategy of sustainable life and application of principles of near-natural...

Báo cáo lâm nghiệp: "Analysis of herbicide effects on Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration" ppsx

... on high growing stock, wood production and especially the values of mensurational indices attract attention. At Analysis of herbicide eﬀects on Douglas ﬁr (Pseudotsuga menziesii [Mirb.] Franco) ... Eﬀect of site preparation on survival and growth of Douglas ﬁr (Pseudotsuga menziesii [Mirb.] Franco) seedlings. New Forests, 3: 89–98. G L. (1996): Production capacity evaluation of the ... Czech)B F. 2007b): Natural regeneration of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) in forest stands of Hůrky Training Forest District, Higher Forestry School and Secondary Forestry...

Báo cáo lâm nghiệp: "Analysis of the production potential of raw wood in the forests of Slovakia" pps

... 2003 SP 26 028 OC 04 Modiﬁcation of Utility Properties of Wood Materials and Extension their Using.Analysis of the production potential of raw wood in the forests of SlovakiaR. P, J. MNational ... in the area dis-tribution of age classes occurred mainly due to the realization of regeneration felling, including salvage felling in the stands of lower age classes. Dynamic changes in the ... country. In the Slovakia considerable attention has been paid to the issues of wood production and regulation of its felling. Permanent forest monitoring, mainly of the growing stock in forest...

Báo cáo lâm nghiệp: "Analysis of snow accumulation and snow melting in a young mountain spruce and beech stand in the Orlické hory Mts., Czech Republic" pptx

... in the last decade of April, the snow melting rate in spruce reached about 26 mm/day, in beech about 28 mm/day and in the open area maximally 37 mm/day. All snow melted in spruce and in the ... process of snow precipitation in the spruce and beech stands, snow depth and snow water equivalent were always higher in the leaﬂess broadleaved stand. At the same time, it has been proved that the ... –● rain; ∗ snow; ●∗ rain with snow; ∗● snow with rainStatistical signiﬁcance of diﬀerences in the snow water equivalent in the spruce and beech stands in the period of snow accumulation...

Báo cáo lâm nghiệp: "Analysis of the aerial application of fertilizer and dolomitic limestone" docx

... variability of the applied amount of fertilizers (meeting the required amount in the particular parts of Habovka area)2001). On the other hand, the complex analyses of aerial spraying and quality ... needles before the application of fertilizer or dolomitic lime-stone, and to evaluate the total amount of substance (whether the amount of substance after application is the same as the required ... an overapplication of lime in 9% to 12% of the ﬁeld and an underapplication on 37% to 41% of the ﬁeld. When analyzing older cases, one of the main ﬁndings is that the variability of the spread...

Báo cáo lâm nghiệp: "Analysis of the accuracy of GPS Trimble Juno ST measurement in the conditions of forest canopy" pot

... Brno, in the vicinity of the Brno Dam, and the second area (area B) was situated northeast of Brno, on the southern border of the for-est ground belonging to the Křtiny Training Forest Enterprise ... for testing the aforementioned GPS JUNO ST, as the accuracy quoted by the manufacturer is 1 to 5 m after post-process correction.Table 1. List of testing pointsPoint No. Forest stand type ... consider the largest obstacle of GPS measuring in a forest stand – adverse geomorpho-logical conditions, then the measurement is signiﬁ-cantly in uenced especially by the structure and age of the...

Báo cáo lâm nghiệp: " Estimation de l’accroissement et de la production forestière à l’aide de placettes permanentes " pdf

... original Estimation de l’accroissement et de la production forestière à l’aide de placettes permanentes concentriquesJacques HÉBERT, Nils BOURLAND, Jacques RONDEUX*Faculté universitaire des Sciences ... placettes circulaires uniques de rayon fixe (18 m) équivalentes à la plus grande des placettes concentriques. De cette manière, nous avons pu procéder à l estimation des accroissement et production ... 3 = petite, moyenne et grande placettes, (1), (2), (3) = au moment de la coupe/mort de l’arbre, celui-ci appartenait à la petite, moyenne ou grande placette (sur base de l’esti-mation de sa...

Báo cáo lâm nghiệp: "Studies on European beech (Fagus sylvatica L.). Part 1: Variations of wood colour parameters" pptx

... separatingperipheral wood (PW), red heartwood (RH) and non red heartwood(NRH) points (mean for 342 boards). Colour variations of European beech wood 631Figure 6 illustrates these variations of colour for L* only ... 10.1051/forest:2005063Original articleStudies on European beech (Fagus sylvatica L.). Part 1: Variations of wood colour parametersShengquan LIUa,b, Caroline LOUPa, Joseph GRILa*, Olivier DUMONCEAUDc, Anne THIBAUTd, ... INTRODUCTIONThe colour of wood differs widely among species and alsowithin a tree. It is an important factor for end user to considerand the price of wood is often dependent on its colour param-eters...

Báo cáo lâm nghiệp: "Classifying xylophone bar materials by perceptual, signal processing and wood anatomy analysis" pdf

... articleClassifying xylophone bar materials by perceptual, signal processing and wood anatomy analysisLoïc BRANCHERIAUa*, Henri BAILLÈRESa, Pierre DÉTIENNEa, Richard KRONLANDb, Bloen METZGERba ... twice/cm by marginal parenchyma bands in Swietenia, 15 times by bandsin Hymenolobium, while in the woods with poor acoustics thetissues were disrupted 35–50 times/cm by parenchyma bandsin Manilkara ... determinedempirically by the xylophone maker, can first be related to the Classifications of xylophone bar materials 81two sound signal parameters, i.e. temporal damping of the fun-damental frequency and to...

Báo cáo lâm nghiệp: "Beech (Fagus sylvatica L.) – Technological properties, adhesion behaviour and colour stability with and without coatings of the red heartwood" ppsx

... (+6.1%for the modulus of elasticity and +7.09% for the bending strength). The swelling behaviour of the beech with red heart is slightlyincreased. The hygroscopic behaviour of the red- hearted ... determine the quantitative colour differences of normal and red- hearted wood and the behaviour of the colour differ-ence during xenon-arc exposure as well as the examination of the influence of different ... disadvantage. The significantly higher values of the bending strength and the modulus of elasticity of the red- hearted sample group canbe explained by the different densities of the sample-sets. The red- hearted...

Báo cáo lâm nghiệp:"Analysis of log shape and internal knots in twenty Maritime pine (Pinus pinaster Ait.) stems based on visual scanning and computer aided reconstruction" pptx

... 137144â INRA, EDP Sciences, 2003DOI: 10.1051/forest:2003006Original articleAnalysis of log shape and internal knots in twenty Maritime pine (Pinus pinaster Ait.) stems based on visual scanning and ... sawing simulation.5. CONCLUSIONSThe use of visual scanning techniques and computer- aided reconstruction was applied for Maritime pines and 3D and 2Drepresentations were obtained for logs and ... access this journal online:www.edpsciences.org Stem and Knots in Pinus pinaster Ait. 143 In summary, the reconstruction of the maritime pine stems based on visual scanning as made in this study allowed...

Báo cáo lâm nghiệp: "Paramètres structuraux et/ou ultrastructuraux facteurs de la variabilité intra-arbre de l’anisotropie élastique du bois" pptx

... PRÉVISIONNELS DE L’ANISOTROPIE ÉLASTIQUE Valider la pertinence de la pyramide des modèles introduitsau chapitre précédent pose deux classes de problèmes. Il con-vient, d’une part, de disposer de valeurs ... originalParamètres structuraux et/ou ultrastructuraux facteurs de la variabilité intra-arbre de l’anisotropie élastique du boisDaniel GUITARD, Christophe GACHET*LEPT-ENSAM-UMR CNRS 8508-Université Bordeaux ... l’AMF de la seuleparoi de bois final, qui passe de ϕ = 10 à 8,5 degrés. La sensi-bilité des caractéristiques élastiques à ce paramètre est trèsforte. Une réduction de 1,5 degré de l’AMF, (depuis...

Báo cáo lâm nghiệp: "Analysis of lipophilic compounds in needles of Pinus pinea L" docx

... (1991) [7] in oleoresin of P. pinea; the last seven acids in wood and bark byHafizoglu (1989) [5], and the first six, in soil of a P. pinea forest and in plant material from this Pinus species ... 28%. The levels of these acids in trees 7 and 8 werevery similar to those of abietic acid, the main resin acid. Lipophilic compounds in Pinus pinea L. 453Table III. Fatty and resin acids, such ... dehydroabietic acids (resin acids). Fifty-six compounds were described for the first time in needles of this Pinus species. Pinus pinea / needle / terpenes / fatty acids / resin acidsRésumé – Analyse...

Báo cáo lâm nghiệp: "doubling atmospheric CO concentration on 2 matter distribution and CO exchange of 2 yr growth, dry 2 old sweet chestnut trees (Castanea sativa Mill.)" pptx

... after a 2 wk adaptation period as the slope of C0 2 concentration over time in the wholechamber (Gaudillere and Mousseau,1989). During the two 1 st 2 wk, the C0 2 concentration ... where environmental conditionswere controlled (22 /15°C day-night, 15 hphotoperiod, 50% RH). Whole plant photo-synthesis at 25 0 jlmol-m- 2 s-1 PPFD and dark respiration were ... total dry matter of C0 2 -enriched chestnut plants observedin the growth measurements.Discussion and ConclusionTree species may react differently to ele-vated levels of atmospheric...

Báo cáo lâm nghiệp: "Carbon partitioning: fructose 2,6-bisphosphate content as an indicator of specific changes in carbohydrate metabolism in needles from class II spruce trees" pot

... be indicative of increased partitioning of carbon intosucrose (starch decreases) and this situa-tion is obviously continued during summer. Class li -specific changes in pool ... based on dry weight) differsignificantly in the levels of starch, TP andF26BP, in that class II needles show adecrease in starch, compared to in- creased amounts of ... situation in class II needles is less straightforward tointerpret.The most interesting change in concen-tration is shown by F26BP. The significant-ly increased amount of this...

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