Báo cáo lâm nghiệp: "Predispositions and symptoms of Agrilus borer attack in declining oak trees" docx

... galleries in infected branches of wilting bur oaks, presumably made by A.bilineatus, but did not investigate the trunks. A. bilineatusappears to start its attacks in the crown of declining oaks and then ... thicker-barked declining oaks. The bark of tree XII wasthe thinnest of all 12 trees studied and, in spite of a considerableleaf loss, this oak showed no evidence of Agrilus- attack. Haack and Acciavatti ... each plot consisted of an equal number of healthy-looking and declining oaks. At the end of June 1997, a preliminary survey was made of insect emergence-holes and longitudinal bark cracks through...

Báo cáo lâm nghiệp: "Quantity and distribution of fine root biomass in the intermediate stage of beech virgin forest Badínsky prales" potx

... with the dominant function of water and minerals supply. e ratio between the fine root length and the number of root tips is an indicator of the intensity of the fine root forking.A direct ... depth and it has almost a linear character in the mineral soil. e comparison of the amounts of explained variance (r2) and the parameters of the linear and nonlinear (exponential) regression ... biomass and the production of fine roots are declining with decreasing soil porosity. e authors also reported that 74% of fine roots (up to 3 mm in diameter) were located in the upper 15 cm of soil...

Báo cáo lâm nghiệp: "Structure and development of forest stands on permanent research plots in the Krkonoše Mts" pdf

... stands) and spruce stands, relict pine woods and stands in the ecotone of the upper forest limit in diff erent site, stand, air-pollution and eco-logical conditions were examined.  e main ... of higher ratio of silver fi r in the forest stand.  e complex diversity of the stand was in the fi rst year of measurement very high, but shows slight de-crease during following years (mainly ... research on structure and develop-ment of forest stands in national parks of Krkonoše Mts. describes the stand of forest ecosystems before during and after the air pollution and subsequent ecological...

Báo cáo lâm nghiệp: "Survival and growth of outplanted seedlings of selected tree species on the High Tatra Mts. windthrow area after the first growing season" pps

... the seedling types of pine was almost 20% in autumn and even 42% in spring outplanting. However, es-pecially the comparison of bareroot and container-ized spruce and pine seedlings in this ... pine seedlings which were in the advanced phase of height growth at spring planting. Height in- crement of containerized Scots pine seedlings from spring outplanting with the application of ... placement of seedlings at outplanting could not always be observed due to piles of waste after felling and root balls. Individual protection of plants against game by the painting of terminal shoot...

Báo cáo lâm nghiệp: "Extent and distribution of beech (Fagus sylvatica L.) regeneration by adult trees individually dispersed over a spruce monoculture" ppsx

... densities in the range of hundreds of individuals per hectare, P- (2000) reported a density in the range of hundreds of thousands in fenced groups of regen-erated individuals. Taking into ... height and thickness of the root collar of sample regenerated individuals selected from within the fencing and outside of it.e basic spatial statistic of the point layer of re-generated individuals ... without protection from game the density is in the range of hundreds of individuals; in protected groups density can be in the range of tens of thousands of individuals per hectare.Keywords: beech;...

Báo cáo lâm nghiệp: "Productivity and cost of manual felling with a chainsaw in Caspian forests" pptx

... the production and cost of other harvesting machines or systems used in the region and will be helpful for the loggers in selecting an appropriate system under certain stand and harvest circumstances.e ... m. e manual harvesting system examined consisted of felling with a chainsaw. Felling was performed us-ing a Stihl chainsaw with 3-horsepower (hp) engine and bar length of 80 centimetres. e ... utilization of Caspian forests (B et al. 2008). Due to the higher initial costs of mechanized harvesting machines, larger diameters and crowns of hardwoods, and the relatively steep terrain in...

Báo cáo lâm nghiệp: "rigins and diversity of the Portuguese Landrace of Eucalyptus globulus" doc

... likely original collectionpoints. Although we argue against other potential areas of ori-gin (e.g. King Island and the Otway Ranges), suggested bysome of the molecular data, it remains a possibility ... [8, 32]. Breeding programs for E. glob-ulus have since been established in other countries includingAustralia, Chile and Spain [12, 32]. In many cases the Aus-tralian origin of these exotic ... col-lected and produced in Portugal, hence representing the local lan-drace. In addition, two trees of know Australian origin were also col-lected (see blind controls in Tab. I), but the origins of...

Báo cáo lâm nghiệp: "Survival and growth of Acacia mangium Willd. bare-root seedlings after storage and transfer from aeroponic culture to the field" pdf

... use of bare-root seedlings con-ditioned in blown-up plastic bags allows the protection of saplings from dehydration and transportation shocks. Fieldtrials in the context of industrial plantings ... shoots, in: Ministry of Forestry of Indonesia (Ed.), Trials established in 1986–1987 in the Mecha-nized Nursery and Plantation Project in South Kalimantan (ATA-267), Jakarta, Enso Gutzeit Ltd, FINNIDA ... inflated with air and sealed. Thebags were stored in darkness for 4 and 6 days (4DD, 6DD) or in theshade for 4 and 6 days (4DS, 6DS). The two other treatments consisted of direct planting of...

Báo cáo lâm nghiệp: " Biomass and composition of understory vegetation and the forest floor carbon stock across Siberian larch and mountain birch chronosequences in Iceland" docx

... B., Beinar maelingar a kolefnisbin-dingu skograektarsvaeda (Direct estimates of carbon sequestrationby afforestation), Procedings from Fraedathing landbunadarins2004, pp. 269–272 (in Icelandic).[27] ... of car-bon from this compartment (Fig. 5). However, after ca. 50–60% thinning (to 1 100 trees ha–1) the C-stock in ground veg-etation of L5 had increased again and there was a net gain of carbon ... and birch woodlands (circles) of different age. The thinned L5stand was not included in the correlation analysis. Error bars indicateS.E. of n = 5 or 8.Figure 4. The relative proportions of...

Báo cáo lâm nghiệp: "Variability and heterogeneity of humus forms at stand level: Comparison between pure beech and mixed beech-hornbeam forest" ppsx

... ordination in the plan defined by axes1 and 2 of the MCA; pure beech stand samples are shown by white squares and mixed stand ones by black points; for pure and mixed stands,the centres of ... tracks,heaps of residual branches and stumps were projected as supplemen-tary individuals in the subspaces defined by the main factors of vari-ance underlined by the MCA.A within inertia analysis ... thick and continuous OLv,a discontinuous but thick OFr and an absent OHr (negativepart); and (ii) samples characterised by an absent OLv, a con-tinuous but moderately thick OFr and a thick and...

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