Báo cáo lâm nghiệp: "Energy consumption of a chipper coupled to a universal wheel skidder in the process of chipping wood" pptx
Báo cáo lâm nghiệp: "Energy consumption of a chipper coupled to a universal wheel skidder in the process of chipping wood" pptx
... In practice we can find more names of these ma-chines like chipper, cutting machine and grinder of wooden mass. All these names are characteristic of a machine which uses mechanical way of ... power and to compare the frequency of rotation on the outlet shaft of the skidder in the process of chipping regarding the torque depend-ing on measurement parameters characteristic of the process ... 2004).ere are many factors in uencing the result of chipping, e.g. the shape and position of a loading inlet, shape and setting of knives, number of knives on a disc and also the shape of a disc....
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Báo cáo lâm nghiệp: "Ground based operation effects on soil disturbance by steel tracked skidder in a steep slope of forest" ppt
... brought to a laboratory from the research area. The samples of litter mass were taken from 0.5 m2 area by collecting all the litter mass in that area. Rut depths were measured in the same points ... these machines are likely to remain the most common type of skid-ding machine used. In mountainous and steep areas, the terrain slope is an important factor that a ects operational ef-ficiency, ... weight of the vehicle is transferred to the low contact area (M et al. 1998). Another reason could be that the average speed of machines was lower com-pared to SC1. When the skidder passes...
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Báo cáo lâm nghiệp: "Forest yield index and its applicability to the assessment of future forest yields" docx
... et al. (1996). A significant increase in radial increment of Norway spruce in Austria in the period of 1961 to 1990, during which the length of growing season increased by 11 days associated ... forest evaluation in Slo-vakia was used as a parameter for the quantification of wood-production function. is parameter is the main component of the classic Faustman model of periodical land revenue, ... value of assortments was obtained from actual market timber prices in the years 1997 to 1998. Expenses on cutting activities were calculated according to actual work standards in the range of...
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Báo cáo lâm nghiệp: "Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation" potx
... interannual variation of ring width index are not included in the model. Past- and cur-rent-year temperature and precipitation are examples of suchvariables that can explain a large part of the ... defoliation record to each site where balsam fir was sampledfor stem analysis according to the known latitude and longitude of adjacent permanent sample plots. A database was then formed to relatetree ... variables but not to site variablessuch as site index (Tab. II). Defoliation variables explained36% of the interannual changes in ring width index of dominantbalsam fir trees that survived the...
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Báo cáo lâm nghiệp: "Can understory vegetation accurately predict site index? A comparative study using floristic and abiotic indices in sessile oak (Quercus petraea Liebl.) stands in northern France" ppt
... coordinate along the first axis of a CA as a potential predictor of the site index variation of Abies alba in the Vosges mountains.4.2.3. Site index indicator values The non-parametric kernel estimation ... Ellenberg indicator values, CA Axes and finally the different variables combined. The tablegives model number, equation, R2 and standard error. G: lateral water gain; L: lateral water loss (topographic ... analysis and the floristic or mineral indices could validate this statement.Thirdly, the measurement of any of these synoptic variables canattenuate spatial and temporal nutrient variations that areknown...
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Báo cáo lâm nghiệp:"Daylength, temperature and fertilization effects on desiccation resistance, cold hardiness and root growth potential of Picea mariana seedlings" docx
... assumptions of normality and equalvariance not be satisfied by applying an appropriate transformation of the data. In these cases, a Kruskal-Wallis one way ANOVA on rankswas carried out. Where the ANOVA ... growthpotential (n = 16 to 50). In the analysis of transpiration data, therewere 3 replications of each hardening regime with a separateANOVA for every date of measurement. For cold hardiness data, a separate ... one-wayanalysis of variance was performed to compare hardening regimes oneach measurement date. Hardening regime was the main-effects com-ponent tested in each ANOVA model. In the analyses of variance,each...
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Báo cáo lâm nghiệp: "Canonical correspondence analysis for forest site classification. A case study* " ppt
... ecologically interpreted. A usual way for assessing the quality of CA is to compute, λCA,k, the eigenvalue associated to the kth ordination axis: λCA,1 ... ≥ λCA,2 ≥ ≥ λCA,k ≥λCA,k + 1 ≥ The same quantities, λCCA,k, may becomputed for CCA and the ... a CA of P where the ordination axes are linearly con-strained by the environmental variables in E; ii)as a discriminant analysis between species; iii)or as a CA applied...
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Báo cáo lâm nghiệp: "Amélioration génétique des Eucalyptus tropicaux. Contribution majeure à la foresterie clonale" ppsx
... vegetativepropagation, clonal selection. A real-scale approach of the clonal culture was carefully investigatedat Pointe-Noire (25 000 ha) as well as at Aracruz (90 000 ha) and dangers ... at the Unit6 d’Affores-tation Industrielle du Congo (U .A. LC.). A lot of results were also taken from the plantations of Aracruz Florestal S .A. in Brazil (Espirito-Santo). The ... survey of the introduction of the genus in tropical environment and the determination of the conditions for the maximal yieldfrom the best-adapted species, the provenances...
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Báo cáo lâm nghiệp: "La variabilité de la sensibilité du hêtre à Nectria ditissima Tul" potx
... reboisement.SummaryVariability of beech susceptibility to N. ditissima canker17 mature trees of the same stand, have been classified into four groups according to canker severity in ... h12" alt="" ...
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