Báo cáo lâm nghiệp: "Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species" pptx
Báo cáo lâm nghiệp: "Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species" pptx
... I. Radius and Growth Strains (×10−6) mean value of tension wood and opposite wood zone from the ten studied trees. Radius Radius GS mean GS meanFamily Genus species author of TW of OW value ... to poplar trees, Ann. For. Sci. 60(2003) 371–378.[17] Coutand C., Jeronimidis G., Chanson B., Loup C., Comparison of mechanical properties of tension and opposite wood in Populus, Wood Sci. ... the trees (except one), we tried to estimate the differencesin radial growth between tension and opposite zone in the last pe-riod of growth when tension wood was produced. From finely sandeddiscs...
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Báo cáo lâm nghiệp: "Beech (Fagus sylvatica L.) – Technological properties, adhesion behaviour and colour stability with and without coatings of the red heartwood" ppsx
... 52182 Testing of wood; determination of density, 1976.[9] DIN 52183 Testing of wood; determination of moisture content,1977.[10] DIN 52184 Testing of wood; determination of swelling and shrinkage,1979.[11] ... loss of finan-cial value of beech [12]. The colour of wood is an importantfactor for end user to consider and the price of wood is oftendependent on its colour parameter [23]. Causes and conse-quences ... strength of solid wood. Analysis of the fracture pattern of the samples after A1 treat-ment revealed a wood failure portion of 80% in the fracture sur-face of the red-hearted samples and a wood...
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Báo cáo lâm nghiệp: "Comparison of the impact of blue spruce and reed Calamagrostis villosa on forest soil chemical properties" pot
... 208–214JOURNAL OF FOREST SCIENCE, 55, 2009 (5): 208–214Nutrient content as well as other chemical and physical properties of soils are the consequence of bedrock, abiotic soil forming factors and impact ... higher (152 and 140 kg/ha). Contents per ha of other nutrients differed up to few percent. Total content of oxidable carbon was 16% higher by CV variant (52 and 44 t/ha) as well. S and N ... total amount of nutrients in humus per ha we found no significant differences. In CV, average (Horn’s mean) content of potassium was 20% higher (87 and 71 kg/ha) and average content of calcium...
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Báo cáo lâm nghiệp: "Comparison of general tree characteristics of less known oak species Quercus dalechampii Ten. and Quercus polycarpa Schur" pot
... the wood of standing living trees. Some fungi of the latter group can invade and kill living sapwood causing death to living trees (D et al. 2007), others live in the heartwood of living ... samples of leaves and cupules for species identification were easily taken away from upper insolated parts of crowns of the previously measured trees. After that, diameters at each 1 m of length of ... Comparison of general tree characteristics of less known oak species Quercus dalechampii Ten. and Quercus polycarpa SchurR. MFaculty of Forestry and Wood Technology, Mendel University of Agriculture...
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Báo cáo lâm nghiệp: " Comparison of deposition fluxes on the open area and in mountain spruce stands of different density" pdf
... deposition fluxes of Ca, Mg, K, S-SO4, N-NO3 and N-NH4 in the dense and sparse spruce stand were 15.7 and 11.6, 4.2 and 3.0, 19.2 and 12.7, 22.5 and 16.4, 8.9 and 7.4, 7.7 and 6.6 kg/ha, ... in throughfall and rainfall sums were the result of different leaf area index and stand density of the studied stands. Water intercepted by the stand canopy of the sparse stand was vaporized ... deposition fluxes within forest stands. e comparison of bulk deposition fluxes of Ca, Mg, K, S-SO4, N-NO3 and N-NH4 in mountain spruce stands of different stand density and bulk deposition fluxes...
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Báo cáo lâm nghiệp: "Comparison of morphological and physiological parameters of the planting material of Norway spruce (Picea abies [L.] Karst.) from intensive nursery technologies with current bareroot plants" ppt
... e dry weight of root systems and shoots, i.e. the dry weight of stem and branches and total dry weight of needles, was markedly lower in plugs.e mean dry weight of one needle and needle density ... results of the analyses of basic nutrient content in needles (Table 2) indicated higher contents of N, K and Mg in plugs compared to bareroot trans-plants. On the other hand, they had lower contents ... illustrate the utilization of light of different intensity. e evaluation of electron transport rate (ETR) from photosystems for their utilization in biochemical Dry weight of 1 needle0.00.51.01.52.02.53.0bareroot...
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Báo cáo lâm nghiệp: "Comparison of ecosystem C pools in three forests in Spain and Latin America" doc
... – To face the lack of information of C content in the main forest ecosystems pools from Spain and Latin America, this study compares C pools of three forest ecosystems: a tropical deciduous forest ... contents in the main pools of ecosystems, be-ing a general rule relating forest from Spain and Latin Amer-ica. The lack of this information in some regions constrains theunderstanding of global ... address this lack of information, the present study compares C contents in themain ecosystem pools of three very different forest ecosystems from Spain and Latin America.2. MATERIALS AND METHODS2.1....
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Báo cáo lâm nghiệp: "Comparison between field performance of cuttings and seedlings of Eucalyptus globulus" ppsx
... theother hand, Lambeth et al. [19], in E. grandis and Menck and Table IV. Comparison of means (and associated F-test) between cuttings and seedlings and variances values for family and clones (and ... sys-tems between cuttings and seedlings of E. globulus have beenreported for this species by Sasse and Sands [25] and Sasse and Sands [27]. These authors reported more deformities and lessradial symmetry ... overall good growth and form.Cuttings and open pollinated seed were collected from them and sub-sequently used to establish field trials. From some of these plus trees, grafts and controlled crosses...
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Báo cáo lâm nghiệp: " Comparison of the hygroscopic behaviour of 205-year-old and recently cut juvenile wood from Pinus sylvestris L." pps
... present in wood and its absorption band. Barker and Owen [4]; Michell and Higgins [23]. Chang and Chang[7]. Functional groups of old wood and new wood. Functional group Wavenumber (cm–1)Old wood ... hygroscopic response of the juvenile wood of Pinus sylvestris L. from recently cut trees from the Valsaín Forest in Segovia,Spain (new wood) was compared to that of the juvenile wood of the same species ... S.Y.,Differences in wood properties between juvenile wood and mature wood in 10 species grown in China, Wood Sci. Technol. 35 (2001)363–375.[4] Barker B., Owen N.L., Identifying softwoods and hardwoods byinfrared...
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Báo cáo lâm nghiệp:" Comparison of soil water-contents as measured with a neutron probe and time domain reflectometry in a " ppsx
... constant of water (Kw), which istemperature-dependent, ranges from 74 to 84 and is about 20-fold higher than that of mineral solids (between 3 and 5), and about 80-fold higher than that of air ... distribution. A “flowing-off” effect was observed, followed by a progressive re-wetting of thesoil profile from the bottom. Both the temporal and spatial variabilities of soil water content were found ... is re-humidified and dried more often;indeed every time it rains. Standard temporal deviations were(±) 0.074, 0.056, 0.059 and 0.057 cm3 cm–3 for the 0–20,20–40, 40–60 and 60–80 cm layers,...
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