Báo cáo lâm nghiệp: "Utilization of a dynamometric pendulum to estimate cutting forces involved during routing Comparison with actual calculated values" pdf
Báo cáo lâm nghiệp: "Utilization of a dynamometric pendulum to estimate cutting forces involved during routing. Comparison with actual calculated values" pdf
... 10.1051/forest:2005040Original articleUtilization of a dynamometric pendulum to estimate cutting forces involved during routing. Comparison with actual calculated valuesFlorent EYMA a *, Pierre-Jean MÉAUSOONEb, ... (rake angle,clearance angle, cutting plane, etc.). The depth of cut has beendecreased to 1mm in order to obtain appropriate chip formation. Eachvalue of cutting forces reported, is a mean of ... the cutting forces involved during routing. In comparison with models used to estimate cutting forces in routing [8], there is an improvement of more than 25% inTable I. Comparison of cutting forces...
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Báo cáo lâm nghiệp: "Utilization of digital photogrammetry in forestry mapping" docx
... triangulation at the aerial images at the scale of 1:15,000 we can say that in the planar accuracy they match the 4th class of cadastral mapping. Based on the results from aerial images at ... orientation of aerial images, triangulation, manual, half-automatic, automatic digital terrain model ge-neration. A digital photogrammetric system should include these modules:– Import of scanned aerial ... testing of digital interpretation methods of aerial images and various other photogrammetric mate-rials, such as black and white aerial images (mul-tispectral, colour infrared aerial images) with...
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Báo cáo lâm nghiệp: "Results of a phenological study of the tree layer of a mixed stand in the region of the Drahanská vrchovina Upland" ppt
... slope of the watershed ridge at an altitude of 625 m. e area is characterized by coordinates 16°41'30''E and 49°26'31''N in the geo-graphical unit of the Drahanská ... 1990 to 2006, mean annual temperature 6.96°C and total precipitation 734 mm were measured. Figs. 3 and 4 characterize the actual situation of the locality from the aspect of precipitation and ... ordinal number of a day from the beginning of the calendar year was assigned to the date of particular phenophases.e following phenological stages of forest trees are evaluated in the paper:...
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Báo cáo lâm nghiệp: " Influence of a planting hole application of dolomitic limestone powder and basalt grit on the growth of Carpathian birch (Betula carpatica W. et K.) and soil chemistry in the air-polluted Jizerské hory Mts." pptx
... the Spekol 210 apparatus, plant available Ca and Mg by AAS (Atomic Absorption Spectroscopy).e samples of assimilatory tissues and soil sam-ples were analyzed at the Tomáš Laboratory using the ... influence of basalt grit on the sum of exchangeable bases, base saturation and cation exchange capacity was also less pronounced compared to liming. Basalt grit elevated the proportion of exchangeable ... diameter and 8% of particles smaller than 0.2 mm. e particle size distribution of the applied basalt material is not optimal. e material was, however, a waste of a local quarry and there was a...
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Báo cáo lâm nghiệp: "Evaluation of a semi-empirical model for predicting fine root biomass in compositionally complex woodland vegetation" ppsx
... rainfall and/or moistureavailability gradient. However, from analysis of globaldatasets, Schenk and Jackson [19] found no evidence thatlateral root spread for trees varies with mean annual rainfall ... bootstrap mean and median calculated on the basis of tree height were more comparable to the bootstrap statis-tics of the measured mean than the corresponding measures calculated by using D30(Tab. ... distributions of predicted bootstrap means and medians from the bootstrap es-timates of the measured data (Fig. 3).4. DISCUSSIONThe aim of this work was to evaluate the capability of an inventory based...
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Báo cáo lâm nghiệp: "Variations of construction cost associated to leaf area renewal in saplings of two co-occurring temperate tree species (Acer platanoides L. and Fraxinus excelsior L.) along a light gradient" doc
... leaf. An average value of 10 measurements obtained on a sub-sample of leaves was calculated for each plant (A UV). A tight cor-relation was found between A UV and the absorbance of a methanolicextract ... results).2.5. Calculations and statistical analysis Leaf mass per unit area (LMA, g m–2) was calculated as the ratiobetween the leaf dry mass and leaf area of all leaves held by the currentyear shoot. ... L.; Acer platanoides L.; Ulmus glabra; Fraxinusexcelsior L. and Tilia cordata. Monthly average for air temperatureranged between 1.6 °C in January to 18.7 °C in July and total annualrainfall...
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Báo cáo lâm nghiệp: "Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. I. Trees and forest floor daily transpiration" ppsx
... 265–274.[22] Granier A. , Anfodillo T., Sabatti M., Cochard H., Dreyer E.,Tomasi M., Valentini R., Bréda N., Axial and radial water flow inthe trunks of oak trees: a quantitative and qualitative analysis, ... (1989) 207–231.[4] Bréda N., Granier A. , Intra- and inter-annual variations of transpi-ration, leaf area index and radial growth of a sessile oak stand(Quercus petraea), Ann. For. Sci. 53 (1996) ... floorLAI (Fig. 8) reached maximal values almost identical to oak LAITable IV. For each year and each plot (Th.: Thinned; C.: Control),percents of each oak (No.; cf. Tab. II) in the daily total sap...
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Báo cáo lâm nghiệp: "Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. II. Daily actual evapotranspiration and soil water reserve" potx
... several ways according to leaf areadevelopment. For periods of leaf area expansion and leaf fall,daily transpiration was calculated with an equation based ondaily PET and on a relative LAI (LAIi/LAImax), ... each plot’s basal area, LAI and SA for the3 years and for each type of species. Total LAI was estimated from litterTable I. For each year and each plot (Th.: Thinned; C.: Control): (a) basal ... methodol-ogy to estimate water use.The main objective of this paper is to estimate these plots actual evapotranspiration (ET) on a daily time step. It was there-fore needed to: (i) estimate canopies water...
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Báo cáo lâm nghiệp: "Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area: Effects on carbon storage" pps
... Ormosia xylocarpa (OX) and Castanopsis kawakamii (CK), with an adjacent relict natural forest of Castanopsis kawakamii(NF, ~ 150 year old) in Sanming, Fujian, China. Overall estimates of total ... mid-subtropicalChina with high purity (85% of total stand basal area for C. kawaka-mii), old age (~ 150 year), and large area (~ 700 ha). In addition to C.kawakamii, the overstorey also contained other ... (Cunninghamia lanceolata) plantation forest; FH, Fokienia hodginsii plantation forest; OX, Ormosia xylocarpa plantation forest;CK, Castanopsis kawakamii plantation forest; NF, natural forest of C. kawakamii....
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Báo cáo lâm nghiệp: "Growth of a poplar short rotation coppice under elevated atmospheric CO2 concentrations (EUROFACE) depends on fertilization and species" ppt
... specific leaf area (SLA), the area of these leaves was calculated. A regression analysis between basalarea and total leaf area of each harvested shoot, was used to calculateleaf area for each shoot ... height of a stool was determined with an extendable pole as theheight of the tallest shoot of the stool. The basal area (BA) of eachshoot, and the sum of basal areas (Σ BA) for each stool were calculated. The ... shoot in a PGP. Summarized for each stool, the leafarea was averaged over a PGP, and the allometric leaf area index(LAIallometric) was calculated. A regression analysis between theLAIallometric...
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