Báo cáo lâm nghiệp: "Roles of European and Japanese larch in the genetic control of growth, architecture and wood quality traits in interspecific hybrids (Larix × eurolepis Henry)" pot
Báo cáo lâm nghiệp: "Studies on European beech (Fagus sylvatica L.). Part 1: Variations of wood colour parameters" pptx
... eccentricity of the stem that prevented the symmetric cutting of the two boards. The two boards of (a) and the southern board of (c) are examples of “non-red heart”(NRH); whereas the two boards of (b) and ... corresponds to the bottom log of one of the 87 trees tested, with the black markgiving the mean and the half-length of the bar the standard devi-ation. The trees are grouped by stands, separated ... Variations among trees and standsThere exist significant differences among the 9 stands and among trees in each stand. The grouping of trees or stand is notalways the same depending on the chosen colour...
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Báo cáo lâm nghiệp: "old hardiness as a factor for assessing the potential distribution of the Japanese pine sawyer Monochamus alternatus (Coleoptera: Cerambycidae) in China" pdf
... ranking the highest in adults and the lowest in the overwintering larvae. The SCP has proved to be a reliable index to estimate the cold hardiness of the beetle M. alternatus. The mean SCP of the ... factor in determining the northern limit of the insect distribution. In our study, we observed that the lowest SCP for the overwintering larvae was –24◦C, and that the LT95for the overwintering ... field, in theory the disease islikely to extend farther and even exceed the distribution range of the beetle. The beetle is one of the most important vectors of the disease in China, control of the...
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Báo cáo lâm nghiệp: "Roles of European and Japanese larch in the genetic control of growth, architecture and wood quality traits in interspecific hybrids (Larix × eurolepis Henry)" pot
... articleRoles of European and Japanese larch in the genetic control of growth, architecture and wood quality traits in interspecific hybrids (Larix × eurolepis Henry)Luc E. PÂQUES*INRA, Unité ... – The respective roles of European and Japanese larch species in the genetic control of traits in interspecific hybrids are examined.Two incomplete factorial mating design experiments involving ... clones. In both factorials, the Japanese larch male component of variance is much higherthan that of European larch (Fig. 2) and the ratio Vm/Vf isincreasing over years in favour of the Japanese larch...
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Báo cáo lâm nghiệp: "Rodent-caused damage to forest trees from the viewpoint of forestry practice" potx
... environment, their feeding behaviour and the damage they cause. At the beginning of the research, we conducted a survey among foresters in the form of a questionnaire with the aim to find out how they ... mammals and the incompleteness of knowledge of their ecology and feeding behaviour have lead us to initiation of an extensive research focused on monitoring the population dynamics of rodents in ... However, this opinion concerning the significance of the individual species is in contradic-tion with the information the foresters provided on the distribution of damage which is the greatest...
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Báo cáo lâm nghiệp: "A fractal root model applied for estimating the root biomass and architecture in two tropical legume tree species" pps
... we applied the Dm of 5 mm. The scaling factor α is defined as the ratio of the square of root diameterbefore bifurcation ( ) to the sum of squares of the diameters of bifur-cating roots ... there is a need to investigate the global relevance of these concepts when applied to other spe-cies. The objective of our contribution is to research the ways of improving the accuracy of the ... evaluation.Contrary to the good agreement of the models of van Noord-wijk et al. [21, 25] and West et al. [27] with data in predicting the scaling of link diameter, the theoretical volume-fillingmodel (Eq....
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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
... evidence that the rate of starch synthesis is controlled by the rates of sucrose formation and trans-port.Metabolites involved in the regulation of carbon partitioning between ... differsignificantly in the levels of starch, TP and F26BP, in that class II needles show adecrease in starch, compared to in- creased amounts of TP and F26BP. In contrast, sucrose, ... cytosolicsucrose synthesis by inhibiting the fruc-tose bisphosphatase (FBPase) reaction(gluconeogenesis) and activating a PPi-dependent phosphofructokinase (PFP; ac-tive in both directions,...
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Báo cáo lâm nghiệp: "Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts" pptx
... with the moist peat-sand substrate and incu-bated as described above (control) . In treatments 6 to 9 the mc of beechnuts was in- creased by sprinkling them with tap water to ob-tain the target ... determine the speed of germination. It was cal-culated according to the modified formula: MGT = ∑(ni × ti) × n –1total where ni is the number of seeds germinated in a specific week (t) and ... increases the production of xylanase forming channels through the walls of the aleuron cells of seed, supporting the release of α-amylase, an en-zyme that stimulates germination by degrading...
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Báo cáo lâm nghiệp: "Effect of climatic factors on the dynamics of radial increments of Norway spruce, European beech and sessile oak" potx
... also the intensity of the effect of significant climatic fac-tors on the increment of trees of the studied tree species. Figs. 5 and 6 illustrate changes of incre-ment indexes in percent in dependence ... mainly in June and July. An increase in precipitation by 1 mm when compared with the long-term average results in an increase in increment index of spruce almost by 0.13%. This index in oak and ... factors on spruce and pine diameter incre-ment in the Czech Republic. In Slovakia Ď and P (1998) dealt with the issue of climate and radial increment of pine, Š and M (1999),...
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Báo cáo lâm nghiệp: "Variation of conducting area in stems of European larch (Larix decidua) growing in fresh mixed coniferous forest and fresh mixed forest sites" pdf
... – the radius of a circle to the beginning of early wood, R – the radius of a circle to the beginning of late wood, P – earlywood area in annual ring.Total area of early wood rings within the ... sapwood area, referring to the area of early wood within the sapwood zone. In the opinion of these authors such a calculated conducting area is a very good estimator of the assimilating and ... initiated by the death of parenchymal cell stabilizes the size of conducting area in trees of younger age classes, and then the cause and effect of the interre-lationship in the transpiring...
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Báo cáo lâm nghiệp: "Variation of the tree form factor and taper in European larch of Polish provenances tested under conditions of the Beskid Sądecki mountain range (southern Poland)" docx
... results of the analysis of the relationship between the stem form of larch of the tested prov-enances and the index of stand density, obtained dur-ing this study, were not expected. Although there ... comprehensive hypotheses on the observed regularities in variation of the stem form of the studied larch partial populations. e authors of the present study are of the opinion that their results ... by means of the taper or diameters at individual heights of the stem, did not show the in uence of the provenance on its variation. Taking into account the dimension traits of trees, the pro-portion...
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