Báo cáo lâm nghiệp: "partitioning and production of 15 N-labelled litter in beech trees" pps

... article 15 N partitioning and production of 15 N-labelled litter in beech trees following [ 15 N]urea sprayBernd ZellerMicheline Colin-BelgrandaÉtienne DambrineFrancis MartinÉcosystèmes ... mea-sured in this litter as a result of successive[ 15 N]urea applications. During the course of this labelling experiment, 4.9, 7.3 and 8.5 kg of 15 N-labelled beech litter ... % 15 N of the harvested litter reached 3.14 and theincorporated 15 N was homogeneously dis-tributed in the soluble and insoluble Nfractions. In summary, spraying [ 15 N]urea...

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

... length and the soil 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 ... 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 ... 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: "Predispositions and symptoms of Agrilus borer attack in declining oak trees" docx

... 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 ... 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 ... of water columns breaking in the xylem of stressed trees. Susceptibility to borer attack and host tree spe-cificity of insects in general may also be related to age-depend-ent, intra- and interspecific...

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

... spruce beech 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. ... result of changing genera-tions of beech. In Krkonoše Mts. the largest reported tree is silver fi r with 182 cm of dbh and 58 m of height. Total volume of forest stands varies between 500 and ... 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...

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 ... most of the dry leading shoots occurred in beech. Besides beech, higher annual height increment of seedlings was observed in autumn than in spring planting time. Effect of Ectovit on seedling...

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

... 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 ... 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; dispersed trees; ... in the stand. Analysis of beech regeneration In the RPs positions were measured with the pa-rameters of regenerating trees (Table 2), including beech regeneration. In the “Telc” and “Ansprung”...

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

... compare 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 ... Estimate the production rates and costs of chain-saw felling.MATERIAL AND METHODSSite of studyis study was carried out in compartment 231 in Chafroud forests in the north of Iran. e altitude ... 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...

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

... Cg33 GippslandAV6 Castelo Branco Cg33 Gippsland King Is. (50): SE Tas (17)ME70 Penamacor Cg33 Gippsland SE Tas (42): Gippsland (21)JG2 Santo Tirso Cg33 GippslandVC9 Valongo Cg33 Gippsland SE ... [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 ... led to inbreeding [12]. Eucalyptusglobulus landrace material is now a major component of thebreeding and deployment populations in Portugal [3,7,12 ,15] .Such programs usually combine the landrace...

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

... occurs in about 15 years, fol-lowed by the first thinning at age of ca. 30 years and with atleast two additional thinnings during a rotation of 80–120 years[5]. The stand density at final harvest ... B., Beinar maelingar a kolefnisbin-dingu skograektarsvaeda (Direct estimates of carbon sequestrationby afforestation), Procedings from Fraedathing landbunadarins2004, pp. 269–272 (in Icelandic).[27] ... 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...

Xem thêm