Báo cáo lâm nghiệp: "Cambioxylophagous fauna of young spruce stands damaged by snow in the Beskids" potx
Báo cáo lâm nghiệp: "Cambioxylophagous fauna of young spruce stands damaged by snow in the Beskids" potx
... gradual. At the end of the growing season, 66% of phloem remained live or in the first stage of wilting. ere is available wood for the invasion of secondary cambiophages in the following growing ... colonized the breaks in particular. e upper and the lower side of the lying breaks-off differ in the intensity of attack and the degree of cover of these species. In young broken and open stands ... the invasion of bark beetles at the turn of June/July and at the end of the growing season, 90% of phloem being heavily wilted or dead. On standing breaks, the progress of the phloem dying...
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Báo cáo lâm nghiệp: "Relative efficiency of alternative methods to evaluate wood stiffness in the frame of hybrid larch (Larix × eurolepis Henry) clonal selection" potx
... selection using indirect method (9% instead of 11.5% – Tab. IX). Meanwhile, the lower estimate of gainslightly affects the final selection of the clone: in this sample(Tab. X) 4 to 5 of the first ... al. of 3 indirect measures of the modulus of elasticity at the dif-ferent steps leading to the production of normalised speci-mens, by means of the Sylvatest1, Grindo-Sonic2 and Pilodyn. The ... radial faces of the same ring, in the same orientation (North andSouth): 2 measurements were carried out in the heartwood, and 2 in the sapwood. The next step was the sawing of each log into 4 boards,...
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Báo cáo lâm nghiệp: "Spatial distribution of four spruce bark beetles in north-western Slovakia" pps
... between the base of the stem and the base of the crown; III, just below the base of the crown; IV, in the middle of the crown; V, in the upper part of the crown. e infestation density of five ... majority of sites having high intensity of tree infes-tation mainly along the main valley in the region. Lower elevations occurring in the southern part of region were often infested by I. duplicatus ... sections of the stem were selected and dissected at the base of the stem; midway between the base of the stem and the base of the crown; just below the base of the crown; in the middle of the crown;...
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Báo cáo lâm nghiệp: "Population genetics of Norway spruce (Picea abies Karst.) at regional scale: sensitivity of different microsatellite motif classes in detecting differentiation" pps
... and of the mode of inheritance on the power of detection of differentiation. The assignment of markers to sets is also supported by the analysis of variance of allele sizes, which allows the measure-ment ... according to their features: set D,including the dinucleotide SSRs; set T, including the trinu-cleotide SSRs; set C, with the chloroplast SSRs. This allowedus to study the effects of the repeat ... differentiation 491 the importance of testing the power of genetic markers in de-tecting differentiation, and the need for assessing the statisti-cal significance of results, in studies of population...
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Báo cáo lâm nghiệp: "Infrared images of heat fields around a linear heater in tree trunks: what can be learned about sap flow measuremen" pptx
... left outside the mainthermal dynamics. The sensors above the heater may on the other hand be left in a quite indifferent region between the foci of the isothermalellipses.What could, in fact, be ... recognized the form of the ellipse: the horizontal distance of the temperature sensorfrom the heating needle gives the segment p = b2/a and the distance of the Txposition above the needle gives the ... way of handling Equation (12)during measurements involves the stable control of the quan-tity PH, the power turnover in the heat probe, with the dimen-sion of Ws mol−1. It should remain...
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Báo cáo lâm nghiệp: "ree nutrition of Norway spruce as modified by liming and experimental acidification at the Höglwald site, Germany, from 1982 to 2004" pdf
... 41] and the various foci and interpretations of the findings of the acidi-fication/liming problems have resulted in very diverse policies,especially in the German states [19]. However, there is ... liming is indi-cated by the lower P-concentrations in C+1andC+2 needles in 2004. Changes in the humus layer after liming may be re-sponsible for it. In a further liming experiment at the Höglwaldsite, ... seven years afterliming [37]. Liming increased the Ca content of the roots at the Höglwald [15], as in other liming [8] or wood ash [9] experi-ments, more distinctly than that of needles. A high...
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Báo cáo lâm nghiệp: "Radial variation of wood density components and ring width in cork oak trees" pptx
... the scar formation with a displacement of extractivesfrom heartwood to the outer sapwood, thereby reducing wooddensity in the innermost rings and increasing it in the outwardrings. Until the ... significantly in uenced by any of the studied sources of variation.4. DISCUSSION In spite of the difficulty in identifying ring boundaries and the resulting necessity in many cases of cross-examinationwith ... amplitude of the variation of densitywithin the rings and, therefore, to a higher number of density peakswithin the ring, which would make it more difficult to identify the rings. The growth ring boundaries...
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Báo cáo lâm nghiệp: "Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought" ppt
... and inverse of osmotic potential at full turgor (Ψπ100). The x- and y-coordinates of the first data point of the linear portion of the PV curve corresponded to relative water content at the ... using the Pearson (r) coefficient, and considering the individual values of all seedlings. Linear regressions of osmotic potential at full turgor (Ψπ100, MPa)and at the turgor-loss point ... provoked a decrease of Ψπ0. The decrease in Ψπ100 and Ψπ0 in moderate stressed seedlings was accompanied by an increase in εmax. The lower ability for osmotic adjustment in seedlingsgrown under...
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Báo cáo lâm nghiệp: "Stomatal response of Quercus pyrenaica Willd to environmental factors in two sites differing in their annual rainfall (Sierra de Gata, Spain)" potx
... found at the end of the summer of 1992, with a lowervalue at the dry site. The soil water stor-age declined bud burst to the end of the summer by 119 mm in the wet ... application of the model, the largerdifferences between observed and simu-lated conductance in the case of FG can beexplained in part by the overall formulation,although the ... comparing the 2 years, the behaviour was very similar for each site. In the case of FG, it should be noted that the data refer to the first hours of the day, andtherefore...
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Báo cáo lâm nghiệp: " Flight activity of Anthribus nebulosus Forster, 1770 (Coleoptera: Anthribidae) and notes to its life history" potx
... at the beginning of May and ended in mid-June with the peak at the end of May and beginning of June in 2005. In 2006, the flight activity started later in mid-May and lasted to the beginning of ... of winter shelters were higher. In the Nízký Jeseník Hills, the flight activity started at the beginning of May and ended in mid-June with the peak at the end of May and beginning of June in ... with the Malaise trap flew in because of their high abundance and the traps being placed in younger spruce forest in longer (several dozen meters) distance from the mature forests where the...
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