Báo cáo lâm nghiệp: "Evapotranspiration of a declining Quercus robur (L ) stand from 1999 to 2001 I Trees and forest floor daily transpiration" ppsx
Báo cáo lâm nghiệp: "Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. I. Trees and forest floor daily transpiration" ppsx
... At the beginning of leaf fall, daily transpiration raised up to 1.8 mm d–1. Forest floor LAI (Fig. 8) reached maximal values almost identical to oak LAITable IV. For each year and each plot ... Thinned; C.: Control),percents of each oak (No.; cf. Tab. II) in the daily total sap flux den-sity (% SFD) and variation coefficient (cv% = standard deviation/arithmetic mean) per period (in ... d–1 ) as measured with the closedchamber during 6 days in 2001 (lozenges and dottedline). Stand (triangles and heavy line) and herba-ceous (histograms) LAI seasonal dynamics areshown as well....
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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
... 10.1051 /forest: 2005060Original articleEvapotranspiration of a declining Quercus robur (L. ) stand from 1999 to 2001. II. Daily actual evapotranspiration and soil water reserveCaroline VINCKE a *, André GRANIERb, ... relative LAI (LAI i /LAImax), with i standingfor the day and LAImax standing for the maximum LAI of theyear. For periods of constant LAI, oak transpiration wasdeduced by interpolation (1 missing ... transpiration tend to dampen morethan to amplify the variations in evaporative demand or annualvariations in water availability [17, 29]. Total stand transpira-tion during vegetation period is about...
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Báo cáo lâm nghiệp: "Dendrochronology of pedunculate oak (Quercus robur L.) in an old-growth pollarded woodland in northern Spain: establishment patterns and the management history" ppt
... hypothesis of random arrangement of ages among oak stems. A significant negative deviation indica-tes aggregation of similarly aged trees, and a significant positive deviation indicates segregation ... clay, with a geologic basement of Jurassic limestone and dolomite [14]. The cli-mate is Atlantic, with a total annual precipitation of 980 mm, and a mean annual temperature of 14 ºC. Tragamón ... corresponding to the significance levels 0.05 and 0.01,were obtained from 100 and 1000 bootstrap samples. A significantnegative deviation was interpreted as evidence of aggregation, while a significant...
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Báo cáo lâm nghiệp: " Dendrochronology of pedunculate oak (Quercus robur L.) in an old-growth pollarded woodland in northern Spain: tree-ring growth responses to climate" pptx
... differed from young trees in their year -to- year sensitivity to local variations in environ-mental conditions.Mean sensitivity is a measure of the relative variability ingrowth indices between adjacent ... others. Stand dynamics and the variation of inter-tree competition is a feasi-ble explanation, because the relative canopy position and thecompetition intensity can result in contrasting radial ... Somepossible explanations for the temporal variation in the climaticresponse of pedunculate oak in Tragamón included a naturalchange associated with stand maturation or tree ageing, and a shift induced...
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Báo cáo lâm nghiệp: "Autoécologie des chênaies de Quercus robur L. en Galice (Espagne)" pdf
... (Quercus robur L .) in Galicia (Spain). A parametric characterization of the biotypes currently in stands of “carballo” (Quercus robur L) in Galicia (Spain) is presented. For this, an inventory of a total ... wereelaborated. This information has permitted the determination of the fisiographic, climatic and edaphic habitat of Quercus robur in central and marginal area in Galicia, as well as the characterisation ... quadratique (DMC),déviation standard de la distribution diamétrale (DED), coef-ficient de variation de la distribution diamétrale (CVD), dia-mètre dominant (DOM), hauteur moyenne arithmétique(HMA),...
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Báo cáo lâm nghiệp: " Growth of wild cherry (Prunus avium L.) in a mixture with other species in a demonstration forest" ppsx
... keep its position in a stand. MATERIAL AND METHODS A large stand with wild cherry trees as a stand- forming species in the area of Demonstration Forests in Kostelec nad Černými lesy in the mixture ... (to the nearest 5 mm), tree height (to the nearest 0.5 m), size of the crown (vertically and horizontally) and tree class evaluation (according to Konšel’s classification). e stand is at an ... with two peaks depicting two layers of wild cherry trees in the stand. e vertical and horizontal structure analysis also shows that in middle aged stands wild cherry trees which are still...
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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
... phenologi-cal stages of plants in the given region.In addition to genetic factors also external condi-tions particularly meteorological factors participate in the variability of the onset and ... characterized period, arithmetic mean, maximum and minimum value, variation range and standard deviation were calculated. Relationships were calculated between selected spring phenological ... sylvatica L. 2007Larix decidua Mill. 2004Larix decidua Mill. 2005Larix decidua Mill. 2006Larix decidua Mill. 2007Day of yearbudbreak 10% beginning of foliage formation 10%beginning of foliage...
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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
... valuable in quali-tative terms, because also the K cations, in contrast to liming, surely participated in it.e increased CEC as a result of liming and also basalt grit application is in line ... Carpathian birch (Betula carpatica W. et K .) at an environmentally harsh mountain site and a response of this species to altered soil chemistry after dolomitic limestone and basalt grit applications. ... coarse basalt grit did not raise a soil reac-tion as markedly as the limestone powder and its influence on the sum of exchangeable bases, base saturation and cation exchange capacity was also...
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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
... data are notavailable to evaluate this possibility.An implicit assumption of the model is that the extent of lateral root distribution is constant along a rainfall gradient.Whether this is ... 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 semi-empirical model ... plants that make up the stand. This assumption is implicitlycarried though in our application of the model to woodlandvegetations with multi-species composition. If this assump-tion is invalid...
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Báo cáo lâm nghiệp: "Utilization of a dynamometric pendulum to estimate cutting forces involved during routing. Comparison with actual calculated values" pdf
... wood and tool. Thus, inexperimentation, it is always necessary to find optimal cuttingconditions to have chip formation and to avoid wrong analysis.In industrial machining, this choice of optimal ... otherspecies: Movinghi (Distemonanthus benthamianus), Ash(Fraxinus excelsior) and Spruce (Picea sp .). Similar mechani-cal properties and machining tests were carried out, and allowed to validate these ... tool’sangles, etc.;– Impacts: very important in machining and responsible forcracking behind the cutting edge.It is a very good representation of reality, and a good way to obtain indications and results...
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