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Báo cáo lâm nghiệp: "Costs of basic methods of forest landmaintenance in protective zones of high-voltage power lines in the Czech Republic" doc

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Báo cáo lâm nghiệp: "Stability of the development of basic stand parameters of beech yield tables constructed on the basis of short-term observations on research plots" pptx

... a small number of their repeated measure-Stability of the development of basic stand parameters of beech yield tables constructed on the basis of short-term observations on research plotsR. ... 3rd generation of yield tables, constructed on the basis of regression fitting of stand data from research plots by mathematical functions, the most distributed. A basis of their high value ... were used for the construction of yield tables in 1980. Of the total number of all 550 repeated measurements 70% of them were used for the construction of yield ta-bles and the remaining 30%...
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Báo cáo lâm nghiệp: " Comparison of three methods to determine optimal road spacing for forwarder-type logging operations" pdf

... formulas. Comparison of three methods to determine optimal road spacing for forwarder-type logging operationsM. R. G1, K. S1, J. S21Department of Forest and Soil Sciences, ... e total cost summary and road spacing for one-way forwarding using the forwarding modelForwarding cost (/m3) Road cost (/m3)Total cost (/m3)Cost (/m3) Road spacing (m) 424 J. FOR. ... 0.14 0.04 428 J. FOR. SCI., 55, 2009 (9): 423–431two-way forwarding, Sundberg’s formula yields the optimal road spacing of 557.7 m. For one-way forward-ing, the optimal road spacing would be...
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Báo cáo lâm nghiệp: "Costs of basic methods of forest landmaintenance in protective zones of high-voltage power lines in the Czech Republic" doc

... methods of forest land maintenance in protective zones of high-voltage power lines (HVPL) 400 kV in the protective zone of 70–80 m in width, and 220 kV in the protective zone of 50–60 m in width ... on the number of trees and tree species that would naturally regenerate in zones of HVPL or in open areas outside the forest the results of which Costs of basic methods of forest landmaintenance ... landmaintenance in protective zones of high-voltage power lines in the Czech RepublicL. ŠFaculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic...
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Báo cáo lâm nghiệp: "Evaluation of three methods for estimating the Weibull distribution parameters of Chinese pine (Pinus tabulaeformis)" pps

... 566 J. FOR. SCI., 54, 2008 (12): 566–571JOURNAL OF FOREST SCIENCE, 54, 2008 (12): 566–571Evaluation of three methods for estimating the Weibull distribution parameters of Chinese pine (Pinus ... on the basis of the mean square error (MSE) and sample size. For these sample plots, the moment method was superior for estimating the parameters of Weibull distribution for tree diameter distribution. Keywords: ... introducing the LSM for fitting the Weibull distribution and compar-ing their performances with the MLE and MOM. The objective of this research is to assess and compare the accuracy of the above three...
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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...
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Báo cáo lâm nghiệp: "Aboveground biomass relationships for mixed ash (Fraxinus excelsior L. and Ulmus glabra Hudson) stands in Eastern Prealps of Friuli Venezia Giulia (Italy)" pptx

... 831Ann. For. Sci. 62 (2005) 831836â INRA, EDP Sciences, 2005DOI: 10.1051/forest:2005089Original articleAboveground biomass relationships for mixed ash (Fraxinus excelsior L. and Ulmus glabra Hudson) ... – About 5% of forest area of Friuli Venezia Giulia (Italy) is covered by mixed ash stands. In most cases, these are secondary forestestablished on former pastures and grasslands in the last ... 1997.[11] Le Goff N., Granier A., Ottorini J.M., Peiffer M., Biomass incre-ment and carbon balance of ash (Fraxinus excelsior) trees in anexperimental stand in northeastern France, Ann. Sci. For. 61...
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Báo cáo lâm nghiệp: "A fire probability model for forest stands in Catalonia (north-east Spain)" pptx

... probability model for forest stands in Catalonia pre-sented in this study opens many possibilities to integrate the riskof fire into forest management planning and decision-making.The parameters included ... stand-level model for the probability of fire adequate for forest management planning in Catalonia. The model should use variables that are normallymeasured in forest inventories in the region ... B.A., Using forest fire hazard modelling in multiple use forest managementplanning, For. Ecol. Manage. 134 (2000) 163–176.[24] Trasobares A., Pukkala T., Miina J., Growth and yield model for uneven-aged...
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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

... articleInfluence of basic density and temperature on mechanical properties perpendicular to grain of ten wood tropical speciesSandrine Bardeta*, Jacques Beauchêneb and Bernard Thibauta,ca Laboratoire ... function of temperature for one wood species (Dicorynia). Each cross represents onevalue of the three repetitions.Figure 7. Illustration of the model of evolution of one criterion respect to temperature. ... effect of temperature on every crite-ria, it was suggested to measure softening temperature on graphs. The curves of criterion in function of temperature wereFigure 6. Evolution of the twelve mechanical...
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Báo cáo lâm nghiệp:"Succession from bog pine (Pinus uncinata var. rotundata) to Norway spruce (Picea abies) stands in relation to anthropic" docx

... Succession from bog pine to Norway spruce stands 351Table I. Vegetation tabular of the phytocoenotic relevés and their synusial relevés in the bog pine stand of phytocoenosis No 1 and in the bog pine ... A., Schweingruber F.H., Gobat J M., Standstructure, invasion, and growth dynamics of bog pine (Pinus uncinata var. rotundata) in relation to peat cutting and drainage in the Jura Mountains, Switzerland, ... 25,35]. In Jura bogs, even-aged stands of bog pine developing ondeep and oligotrophic peat reflect mainly drainage and peatcuttings [17]. The pine population of the bog pine- spruce mixed stand in...
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Báo cáo lâm nghiệp: "Reconstruction of crown length of Norway spruce (Picea abies (L.) Karst.) and Silver fir (Abies alba Mill.) – technique, establishment of sample methods and application in forest growth analysis Peter SPATHELF" ppt

... Norway spruce (Picea abies (L.) Karst.) and Silver fir (Abies alba Mill.) technique, establishment of sample methods and application in forest growth analysis Peter SPATHELFForstdirektion Tỹbingen, ... competition,right: Norway spruce, released; diagonal = crown length 0).Figure 9. Development of crown ratio (cr) of thinned and unthinned Norway spruce and Silver fir up to 10 years since thinning. With ... 19.20.24 9 2 10 3 24.81.06Note: Silver fir whorls are in the upper part (stands 1–3 and 5), Norway spruce whorls in the lower part (stands 4 and 6–9 ) of the table.*l: Localisation of whorl samples...
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Báo cáo lâm nghiệp: "Fertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlings" pot

... articleFertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlingsDouglass F. JACOBSa,b*, Robin ROSEa, Diane L. HAASEa, Patricio ... the poor root development of seedlings fer-tilized at a relatively high rate in this study.We expected increased root proliferation at or above theposition of CRF placement and greater root damage ... likely a function of greater allocation of biomass to shoot relative to root tissues and the reductions in root biomass, first-order lateral -root length, and number of white root tips, which limited...
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Báo cáo lâm nghiệp: "Physiological, morphological and growth responses to rhizosphere hypoxia by seedlings of North American bottomland oaks" potx

... and 800 μmol m-2 s-1. Stomatal conductance and Original articlePhysiological, morphological and growth responses to rhizosphere hypoxia by seedlings of North American ... stomatal and photosynthetic responses of three bottomland tree species. For Sci 32, 914-923Ponnamperuma FN (1984) Effects of flooding on soils.In: Flooding and Plant Growth ... Photosynthetic and growth responses of silver maple (Acer saccharinumL) seedlings to flooding. Am Midl Nat 112, 261-272Pezeshki SR (1991) Root responses of flood-tolerantand...
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Báo cáo lâm nghiệp: "Light-quality and -quantity effects on monoterpene-mediated photo-bleaching of conifer needles" pot

... Light-quality and -quantity effects on monoterpene-medi-ated photo-bleaching of conifer needlesJ. Franzen1K. Gross2M. Bonzon3E. Wagner1Institutes of I Biology 11 and 2 Silviculture, ... and youngplants with P-pinene resulted in a monoter-pene concentration- and photofluency-dependent destruction of chloroplast pig-ments resembling the phenomenon of ’montane ... influen-ce of light quality on monoterpene-medi-ated photo-bleaching of chloroplast pig-ments and on the levels of a-tocopherol.Materials and MethodsIn the various fumigation experiments,...
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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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