Báo cáo lâm nghiệp: "An approach for the analysis of vegetation spectra using non-linear mixed modeling of truncated power spectra" pdf

... to the spec-tral variance is denoted by TT.2.3. Non-linear mixed model of power spectra Visual inspections of truncated power spectra suggested the following non-linear relationship between the ... with the relative ease of modeling the trends in a power spectrum withina well-known statistical framework is perhaps the best feature of the proposed approach to analysis of vegetation spectra. ... E.L., Theory of Point Estimation, Wiley, New York,1983. Analysis of vegetation spectra 519In the Fourier representation of the spectra, a maximum of 48 frequencies sufficed to approximate the...

Báo cáo lâm nghiệp:" How to relate the standing tree shape to internal wood characteristics: Proposal of an experimental method applied to poplar trees" pptx

... to the method described inSection 2.4.3. Using these geometric data, we computed the pith location, the centre of gravity of the disc [13] and the centre of gravity of the tension wood area. The ... In the example given, and to illustrate the method, the char-acterisation of the disc included the annual ring limits, the outline of the bark, the external limit of the black heart, and the ... description of the disc was obtainedby using the 2D coordinates of the targets in the image completed bya manual measurement of the distance between the plane containing the surface of the disc...

Báo cáo lâm nghiệp: "An economic aspect of conversion of Scots pine (Pinus sylvestris L.) stands in the Polish Lowland" docx

... aim of the analysis has been to ﬁnd an optimal date of conversion beginning. e date of conversion beginning has been ﬁxed on the basis of the relation of the value of wood increment from the ... was obtained from the Regional Directorate of the State Forests in Poznań and derive from the Informatics System of the State Forests. In business practice these kinds of data describe in ... account incomes and cost of processes.MATERIAL AND METHODSAll the performed analyses were carried out on the basis of a computer database of the State Forests for the region of Wielkopolska (Western...

Báo cáo lâm nghiệp: " An estimation of willingness to pay for asparagus (Asparagus racemosus Willd.) collectors in Makawanpur District, Nepal" ppsx

... of the Makawanpur district is forest, which includes 6.2% of the RCNP. Another 93.8% of the RCNP lies in three other districts (Chitwan, Nawalparasi and Parsa districts). Roughly 70% of the ... ﬁnal set-ting. Before formulating the exact wording of the question, two meetings of collectors were organized in February 2002; one for the Tamang caste and another for the Praja caste. ey ... countries, the CVM has been used for estimating the existence value of biodiversity. For example, D and S (1990) used the CVM to estimate maximum WTP for the continued existence of the...

Báo cáo lâm nghiệp: "New insights in the recognition of the European ash species Fraxinus excelsior L. and Fraxinus angustifolia Vahl as useful tools for forest management" pdf

... zones of sympatry (codes are listed in Tab. II). Crosses are plotted at the coordinates of the four phenotypes in the first two dimension of the SCA (the first number in the brackets represent the ... 16.32% of the observed variation (Fig 1). The populationsfrom the zone of sympatry were distributed between the twogroups, and the population of St-Dyé (S5) was a good example of a mixed population.3.2. ... twospecies: the proportion of the extreme phenotypes (10 and 01)determined the first axis (which explained 73.65% of the ob-served variation), while the second axis represented the pro-portion of intermediate...

Báo cáo lâm nghiệp: "An improved micropropagation protocol for stone pine (Pinus pinea L.)" potx

... presence of BA showed the formation of nodular primordia on the entire surface of cotyle-dons in contact with the medium, although shoot organogen-esis was higher on the basal segment of the cotyledons ... adventitiousshoots on the cotyledons required the presence of cytokinin in the culture medium. Except for iPR and RZ, the other assayedcytokinins induced bud formation in cotyledons. The highestpercentage ... agronomic tree. The existence of a widepotential for improvement and the great economic value of the pine nuts gives good reasons for genetic breeding pro-grams. These programs are based on the identiﬁcation...

Báo cáo lâm nghiệp: "An integrated analysis of 33 Eucalyptus trials linking the onset of competition-induced tree growth suppression with management, physiographic and climatic factors" pptx

... which some form of vegetation control wasnecessary. The regular measurement of the trees in these trials (everytwo to four weeks) allowed for plotting of the two growth curves fromwhich the initial ... burning) and the interaction between these two factors were signiﬁcantly related to the timing of tree growth suppression. Regardless of the method of site preparation, the onset of competition-induced ... the eﬀect of site preparation on the rate of seed germina-tion (Fig. 1). At lower altitudes, regardless of whether the sitewas burned or not, the growth of the vegetation was vigorousand competition-induced...

Báo cáo lâm nghiệp:"An examination of the interaction between climate, soil and leaf area index in a Quercus ilex ecosystem" ppt

... a function of the retention properties of the soil and of the rooting depth of the vegetation. The range of LAI obtained with varying water availability is in agree-ment with data of Damesin ... allows the treatment of non-linear- ities. We therefore recommend the use of such a model todescribe the equilibrium between leaf area and environment.In the case of Mediterranean ecosystems the ... have further summarized the adjustment of leaf area for some Mediterranean shrub species in the Californian chaparral: the main response of the shrubs todifferent precipitation regimes in the chaparral...

Báo cáo lâm nghiệp: "Ecological conditions influencing the localization of egg-laying by females of the cockchafer (Melolontha hippocastani F.)" pps

... relation between the extent of the damage and the individual characteristics of the experimental plots. e relation between the extent of the damage and the method of estab-lishment of the stands ... of the sample plots were sources of maturation feeding of the beetles and a place where they gathered. It is a factor, which contributes to the selection of plac-es in the neighbourhood for ... is due to the fact that the proportion of pine in re-forestation in the region is ca 90%.e eﬀect of the method of establishment of the plantation on the damage of plants showed a sta-tistically...

Báo cáo lâm nghiệp: "A pheasantry as the habitat of small terrestrial mammals (Rodentia, Insectivora) in southern Moravia (Czech Republic)" doc

... – form of feed) on the diversity of the community of small terrestrial mammals and on the abundance and viability of their populations. Area of studyTwo pheasantries were selected for the ... terrestrial mammals of pheasantries in southern Moravia is therefore aimed at monitoring the eﬀect of speciﬁc properties of these habitats (high diversity of biotopes, high concentration of pheasants, ... the high diversity of sites, high concentration of pheasants and high amount of supplementary food in the form of feeding for pheasants. Moreover, in the region of southern Moravia, pheasantries...

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