Báo cáo lâm nghiệp: "Uncertainty estimation of biomass expansion factors for Norway spruce in the Czech Republic" pot

Báo cáo lâm nghiệp: " Flight activity of Anthribus nebulosus Forster, 1770 (Coleoptera: Anthribidae) and notes to its life history" potx

... 17°58'46.72''E, 460 m a.s.l.; Flight activity of Anthribus nebulosus Forster, 1770 (Coleoptera: Anthribidae) and notes to its life historyJ. H1,2, M. T31Forestry and Game Management Research ... consump-tion, mating behavior, and shelter selection of Anthribus nebulosus Forster (Coleoptera: Anthribidae), an introduced predator of scale insects in Virginia. Virginia Journal of Science, 34: 237–250.KOSZTARAB ... fact that the ﬂight activity of both sexes is the same. J. FOR. SCI., 53, 2007 (Special Issue): 11–15 15Letová aktivita Anthribus nebulosus Forster, 1770 (Coleoptera: Anthribidae) a poznámky...

Báo cáo lâm nghiệp: "Spatial distribution of four spruce bark beetles in north-western Slovakia" pps

... traps give information influenced by mi-gration of beetles. CONCLUSIONSI. typographus remained dominant species on the majority of sites having high intensity of tree infes-tation mainly along ... understanding of bark beetles spatial distribution. It may be used for practical forest protection only as preliminary information.No environmental factor controlling observed pattern of bark beetles ... Ips typographus L. remained dominant species on majority of sites having high intensity of infestation. Lower altitudes in the south-eastern part of the region were often infested by I. duplicatus...

Báo cáo lâm nghiệp: "On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic" potx

... 57–62Because of the lack of a recent survey of Cephal-cia species in the Czech Republic, the goals of this study were (i) to monitor web-spinning sawﬂies liv-ing on spruce in mountainous regions ... species occurrence. Canonical axes explain 65.8% of variability J. FOR. SCI., 53, 2007 (Special Issue): 57–62 59Table 1. Survey of studied web-spinning sawﬂies of the genus Cephalcia in the Czech ... periods of the Cephalcia species ﬂight activities (cf. M- 1988). e ﬂight activity started in the stud-ied localities at the end of May or at the beginning of June depending on the actual...

Báo cáo lâm nghiệp: "Eﬀect of Melampsora larici-populina on growth and biomass yield of eight clones of Populus nigra" ppsx

... intensity of Melampsora larici-populina occurrence and the value of growth traits and biomass yield in Populus nigra  e correlation between the growth traits of stem diameter and plant height and ... some clones (clones 7 and 107) no yield decline was observed at all or it ranged only from 6% to 9% (clones 49 and 152). It is to note that clone 107 and clone 152 were among the highest-yielding ... stability of the degree of infection within the particular clones of black pop-lar in the years of observation, the relationship be-tween the severity of clone infection by rust and the value of...

Báo cáo lâm nghiệp: "Horizontal structure of forest stands on permanent research plots in the Krkonoše Mts. and its development" ppsx

... given site condi-tions and stand type. From the aspect of horizontal structure, during the small forest development cy-cle, the majority of the stands in national parks of the Krkonoše Mts. proceed ... 539ment and to the documentation of a great impact of anthropogenic processes (mainly of air pollution and forest management) on the condition and de-velopment of the Krkonoše Mts. forests. ... national parks of the Krkonoše Mts. has brought about the knowl-edge of successions of developmental stages and phases in the most important stand types of the Krkonoše Mts. forests, both in...

Báo cáo lâm nghiệp: "Health status of forest stands on permanent research plots in the Krkonoše Mts" pptx

... METHODSDescription of permanent research plots Similarly like in the evaluation of the condition and development of soils the condition and develop-ment of health status of forest stands were evaluated in ... described on the basis of evaluation of transition matrices describing the probability of a change in the assess-ment of defoliation of particular trees in defoliation classes. The condition and ... spruce stands in the Czech part of the Krkonoše Mts. on 32 PRP has been evaluated in the long run by foliage and by degrees of defoliation using the following scale:Degree of defoliationFoliage...

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

... t in 1998/99 and 74.9 t in 2000/01 (DFO 2002). Of the total amount of asparagus exported from Nepal, the An estimation of willingness to pay for asparagus (Asparagus racemosus Willd.) collectors ... Pre-testing of questionnaire and its 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 ... kg4.Selection of collectors for elicitation of WTPe majority of asparagus collectors in Makawan-pur district, who lived adjacent to the RCNP, belong to the Tamang and Praja castes. Both of them...

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

... 10.1051/forest:2006046Original articleInfrared images of heat ﬁ elds around a linear heater in tree trunks: what can be learned about sap ﬂow measurement?Helmut T a *, Nadezhda Nb,JanCb a Hahn-Meither ... isotherm of temperature TSparallel to the sap ﬂow direction. In absence of sap ﬂow this axial distance should be named a ax. In presence of sap ﬂow there will be thermalconduction along a similar ... Infrared images of heat ﬁeld and sap ﬂow 657Figure 3. ( A) IR-image of the heat ﬁeld in the stem xylem around a linear heater under zero -ﬂow conditions: M – center of an ellipse,...

Báo cáo lâm nghiệp: "Eﬀect of leaf biomass and phenological structure of the canopy on plot growth in a deciduous hardwood forest in northern Japan" pot

... eachcombination of plot and month. Annual leaf biomass was calculatedby summing monthly leaﬀall.To quantify the phenological pattern of leaﬀall and the corre-sponding phenological structure of the ... 2006)Abstract – We monitored leaf biomass, seasonal changes in leaﬀall, and plot growth for 11 years post-thinning in a secondary deciduous hardwood stand dominated by Betula maximowicziana Regel ... 0.05;Tab. II). Eﬀect of leaf biomass and phenological structure on plot growth 731Figure 5. Yearly changes in the ratio of fallen leaf biomass in October and November to annual fallen leaf biomass...

Báo cáo lâm nghiệp: "Uncertainty estimation of biomass expansion factors for Norway spruce in the Czech Republic" pot

... the best way to increase the preci-sion of BEFs would be the reduction in error of the biomass and volume models (Fig. 5). Examining the sensitivity in un-certainty of the BEF by ignoring the ... age-classes (reﬂecting the available format of sourcedata) and as a single value and to analyse the associated BEFuncertainty for Norway spruce stands in the conditions of the Czech Republic.2. ... sitesdespite the varying values for stand age and stocking densities. The decreasing rate of the BEF as a function of age wassteeper in the Czech Republic than in Finland according toLehtonen...

Báo cáo lâm nghiệp: "Radial variation of wood density components and ring width in cork oak trees" pptx

... eﬀect of bark stripping on wood produc-tionincorkoak(Quercus suber L.) and problems of growth ring deﬁnition, in: Pereira H. (Ed.), Cork oak and cork, Proceedings of the European Conference on Cork ... average ring density; MND, minimum density; MXD, maximum density; EWD, earlywood density, LWD, latewood density; RW, ring width; LWP,latewood percentage; HI, heterogeneity index. In relation to ring ... the innermost rings and increasing it in the outwardrings. Until the beginning of cork extraction the accumulation of extractives should contribute to the higher density valuesfound in the innermost...

Báo cáo lâm nghiệp: "Lysimetric study of eucalypt residue management eﬀects on N leaching and mineralization" potx

... placement) of woody residuesfrom eucalyptus plantations on N availability and leaching, a study was developed in controlled conditions (lysimetric ex-periment), in the absence of nutrient uptake. ... rotation of eucalyptsplantations [19], and the environmental conditions are mod-iﬁed (e.g., soil water content, absence of root exudates and root uptake). Although experimental conditions have ... plantations in Congo [25], where nitriﬁcation and amoniﬁcation were of the same order of magnitude. Thissuggests that the eﬀect of eucalyptus harvest residues alone on the mineral N dynamics...

Báo cáo lâm nghiệp: "Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought" ppt

... 62 (2005) 377384â INRA, EDP Sciences, 2005DOI: 10.1051/forest:2005033Original articleWater relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate droughtMarta ... are found to help cork oak seedlings to maintainturgor during moderate water stress and under high light envi-ronment (> 40% of full sun). In contrast, in seedlings grownunder moderate water ... Osmoticadjustment in Pinus pinaster cuttings in response to a soil dryingcycle, Ann. For. Sci. 59 (2002) 795–799.[36] Niinemets Ü., Role of foliar nitrogen in light harvesting and shade-tolerance of four...

Báo cáo lâm nghiệp: " A collection of functions to determine annual tree carbon increment via stem-analysis" pot

... hi).Stem lateral surface area (A) is calculated as the sum of eachlog lateral area and the lateral area of the cone formed by tree tip: .2wG ⋅=π()iiiiihhGGv −⋅+=++112()ntreenniihhGvV ... dell'Appennino Pistoiese, inAtti del seminario funzionalità del sistema faggeta, Accademia Ita-liana di Scienze Forestali, 1995, pp. 309–318.[6] Carey E., Sala A. , Keane R., Callaway R.M., Are old forests ... Frattegiani M., Manetti M.C., Il metodo di analisi delfusto. Confronto tra cinque metodi di stima della relazione altezza-età, Annali dell'Istituto Sperimentale per la Selvicoltura, Arezzo...

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

... Pilodyn. The final objective of this study is to ascertain the easiestmethod of ranking hybrid larch clones according to their wood stiffness. 2. MATERIALS AND METHODS 2.1. Testing methods The first ... 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, ... measurements per tree).Taking into account the time needed to measure with the different devices, a two-step selection seems to be an interest-ing solution in the frame of hybrid larch clonal selection:...

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