Báo cáo lâm nghiệp: "Assessment of tension wood detection based on shiny appearance for three poplar cultivars Miguel Angel BADIA, Frédéric MOTHE, Thiéry " pot
Báo cáo lâm nghiệp: "Assessment of tension wood detection based on shiny appearance for three poplar cultivars Miguel Angel BADIA, Frédéric MOTHE, Thiéry " pot
... 2005DOI: 10.1051/forest:2004093Original articleAssessment of tension wood detection based on shiny appearance for three poplar cultivars Miguel Angel BADIA, Frédéric MOTHE, Thiéry CONSTANT*, Gérard ... macroscopic detection of small areas. tension wood / poplar / macroscopic detection / microscopic measurement / image analysis / wood anatomyRésumé – Évaluation de la détection du bois de tension basée ... 80% of the cases (Tab. IV).4. CONCLUSIONSA fast macroscopic method for detecting tension wood on freshly sawn poplar disks was discussed. The method, based on the difference in shininess of tension...
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Báo cáo lâm nghiệp: "Assessment of some forest characteristics employing ikonos satellite data" docx
... evaluation, appear spectral vegetation indices for both applications. ese are sensitive indicators of on- the-scene” presence and condition of vegeta-tion, mainly slope -based vegetation indices, ... trifidus (e2 = 0.43). For a better explanation of texture contribution to classification accuracy classification results of classi-fication C (classification without texture utilization) are also summarized ... evaluation of classification results, when 23% of them were used purely for control and 77% of training polygons from the ground survey were also applied for the training polygon creation.e results...
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Báo cáo lâm nghiệp: "Assessment of the assortment potential of the growing stock – a photogrammetry based approach for an automatized grading of sample trees" potx
... for reasons of stem visibility.4. CONCLUSIONS AND PERSPECTIVESThe photo-documentation of sample trees can be used for the calculation of stem dimensions and for the interpretation of stem surface ... are often based on a non-market ori-ented visual quality assessment or referred to quality classes based on general grading rules for round wood (e.g. [14]). Be-sides, information based on visual ... combinations for later identi-fication of the “best” assortment combination out of economicpoint of view. As rule of thumb, not more than 5 different com-binations should be tested. Each combination...
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Báo cáo lâm nghiệp:"Influence of basic density and temperature on mechanical properties perpendicular to grain of ten wood tropical species" pot
... measure softening temperature on graphs. The curves of criterion in function of temperature wereFigure 6. Evolution of the twelve mechanical criteria in function of temperature for one wood species ... cross represents onevalue of the three repetitions.Figure 7. Illustration of the model of evolution of one criterion respect totemperature.Mechanical properties of tropical wood 59Referring ... conditions, the drasticchange of mechanical properties can be brought about by theglassy transition of one of the polymeric constituent of wood: lignin [4, 9]. Nevertheless, one should not forget...
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Báo cáo lâm nghiệp:"Predicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part II: Computation of macroscopic properties and microscopic stress fields" pdf
... constrainedalong one direction (drying configuration).2. HOMOGENISATIONHomogenisation is one of the formulations that allows theprediction of the macroscopic properties from the microscopicdescription ... configuration), whereas the second assumes that the macroscopic displacement is constrained along one direction(drying configuration). wood / homogenisation / modelling / numerical computationRésumé ... posi-tion of boundaries between different kinds of tissues, while thecoloured zones represent the deformation of these zones ascalculated for each elementary solution (an amplification fac-tor...
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Báo cáo lâm nghiệp: " Influence of repeated defoliations by insects on wood increment in common oak (Quercus robur L)" pps
... therefore used the former one alone todescribe annual wood increment.Short noteInfluence of repeated defoliations by insects on wood increment in common oak (Quercus robur ... search for potential correlationsbetween annual increment and degree of defoli-ation was restricted to years with defoliation ratesabove 35% and devoid of additional stressessuch ... oaks after one to three moderate defoliations. A factor two vari-ation was observed in the intensity of the responses, depending on actual climate. In response torepeated...
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Báo cáo lâm nghiệp: "Assessment of the effects of below-zero temperatures on photosynthesis and chlorophyll a fluorescence in leaf discs of Eucalyptus globulu" pps
... as reliable screening tests for the detection of low temperature effects on leaves of E. globulus.ReferencesBaker N.R., East T.M. & Long S.P. (1983) Chil-ling damage ... functioning of thyla-koids in vivo. J. Cxp. Bot. 34, 189-197Lichtenthaler H.K. & Rinderle U. (1988) Therole of chlorophyll fluorescence in the detection of stress conditions ... Agronomia, 1399 Lisbon Codex, PortugalIntroductionThe sensitivity of plants to low tempera-tures has been assessed by a number of methods, including measurements of visible...
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Báo cáo lâm nghiệp: " Assessment of the contributions of glycolysis and the pentose phosphate pathway to glucose respiration in ectomycorrhizas and non-mycorrhizal roots of spruce (Picea abies L. Karsten)" docx
... degradation for respiration and for energy and reducing power productionand 2) conversion of plant carbohydratesinto fungal biomass. The high respirationrate of fungal ... 69,569-581Vignon C., Plassard C., Mousain D. & Salsac L.(1986) Assay of fungal chitin and estimation of mycorrhizal infection. PhysioL V6g. 24, 201-207Assessment of the contributions ... greater fraction of the assimi-lated carbon to respiratory C02 than donon-mycorrhizal plants (for a review, seeMartin et al., 1987). The establishment of a carbon sink by...
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Báo cáo lâm nghiệp: "Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts" pptx
... (19)400–550 77 71 267.8 9.0 *Based on four replicates of 100 seeds each; * *Based on two replicates of 10 g of seeds each; ** *Based on eight replicates of 100 seeds eachJ. FOR. SCI., 56, 2010 (9): ... 4; Fig. 2).We found no apparent effect of different concen-trations of ethephon or GA3 on germination ca-pacity. e only exception was the application of 1,000 mg·l–1 GA3 to dormant seeds ... etiolation of the seedlings or cause seedling mortality. e le-thal concentration of GA3 for seeds of some spe-cies is 1,000 ppm, while 500 ppm has no effect and the 750 ppm concentration has...
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Báo cáo lâm nghiệp: " Consequences of increased deer browsing winter on silver fir and spruce regeneration in the Southern Vosges mountains: Implications for forest management" potx
... Browsing medium + high. (1) Comparison of the distribution of the three types of fir regenera-tion with the rest of the regeneration. (2) Comparison of the distribution of the two Bl types with the ... populationlimitation and alteration in distributions of elk following the rein-troduction of wolves into Yellowstone National Park, US, Oralcommunication, International Conference on Forest Dynamics andUngulate ... compensating for the potential mor-tality of seedlings due to browsing. Therefore, stand composi-tion was considered as an additional site factor affecting thesubstitution of fir by spruce.The aim of...
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