Báo cáo lâm nghiệp: "The influence of irradiation on the behaviour and reproduction success of eight toothed bark beetle Ips typographus (Coleoptera: Scolytidae)" doc

... of irradiation on the behaviour and reproduction success of eight toothed bark beetle Ips typographus (Coleoptera: Scolytidae)M. T1, J. V21Faculty of Forestry and Wood Sciences, ... SlovakiaABSTRACT: Irradiation experiments on Ips typographus (L., 1758) with doses of 15 and 30 Gy (cobalt 60) were con-ducted in 2006. e effect of irradiation on the mating behaviour and reproduction success ... however. We can conclude the doses of 15 and 30 Gy do not have a significantly negative effect on the behaviour of ir-radiated males in the preparation of entry holes and the creation of mating chambers....

Báo cáo lâm nghiệp: "Mineral nutrition in relation to the Norway spruce forest decline in the region Horný Spiš (Northern Slovakia)" docx

... Supported by Grant Agency of the Slovak Republic, Project No. 2/4159/04.Mineral nutrition in relation to the Norway spruce forest decline in the region Horný Spiš (Northern Slovakia)Ľ. D1, ... (3): 93–100 97lings from the forest nursery planted in the substrate from the declining forest stand, 6 – spruce seedlings from the nursery planted in the soil substrate from the beech stand).An ... the experiment in which we compared the seedlings planted in the soil with intensive impact of spruce litter and the seedlings planted in the sub-strate from the beech stand (without the in uence...

Báo cáo lâm nghiệp: "Ground based operation effects on soil disturbance by steel tracked skidder in a steep slope of forest" ppt

... precipitation rates, these machines are likely to remain the most common type of skid-ding machine used. In mountainous and steep areas, the terrain slope is an important factor that a ects operational ... costs and erosion. It may also a ect the soil compaction, so in planning forest operations and aligning skid trails the terrain slope may be an im-portant consideration for protecting soil ... productivity can be originated by such intense logging operations.e common eﬀects on soils from ground based forest operations are increased compaction and removal of litter mass in skid trails (T...

Báo cáo lâm nghiệp: "Environmental risk assessment based on semi-quantitative analysis of forest management data" pptx

... 89–95 89JOURNAL OF FOREST SCIENCE, 57, 2011 (3): 89–95Environmental risk assessment based on semi-quantitative analysis of forest management dataL. K1, R. M21 Forest Research ... damage.DISCUSSION e developed regression models can be considered as standalone complex models of environmental risk prediction allowing the “chance and potency” analysis using a traditional regression ... expected at the end of the forest production cycle (rotation period), each aspect or incidence of dam-age causes a loss in value.  erefore one of the main tasks of forest management is to reduce...

Báo cáo lâm nghiệp: " Fungi associated with Tomicus piniperda in Poland and assessment of their virulence using Scots pine seedlings" doc

... 801c INRA, EDP Sciences, 2006DOI: 10.1051/forest:2006063Original article Fungi associated with Tomicus piniperda in Poland and assessment of their virulence using Scots pine seedlingsRobert ... col-onizer of pine tree stems. Tomicus piniperda, together with itscogener T. minor (Hrtg.), ranks among the main insect pests of Scots pine in Poland. Other Pinus species also occasionallybecome infested. ... foresttree species in East-Central Europe. In Poland, forest stands with Scots pine dominance occupy 68% of the total forestarea [47]. The larger pine shoot beetle, (Tomicus piniperda (L.)Coleoptera:...

Báo cáo lâm nghiệp: "Drought conditioning improves water status, stomatal conductance and survival of Eucalyptus globulus subsp. bicostata seedlings" ppt

... between survival and RWC 36-days aftertransplanting in seedlings of E. globulus. subsp. bicostata Each pointrepresents the mean value of ﬁve observations of each treatment.to plant survival and ... among prove-nances of several Eucalyptus [25, 42], between and withinsubspecies of E. globulus [15, 54], as well as among clones of E. globulus subsp. globulus [34]. After preconditioningwe detected ... 297–302. Drought conditioning in Eucalyptus seedlings 947Figure 4. Midday relative water content (RWC,% )and stomatal conductance (gs) in seedlings of E. globulus subsp. bicostata over the...

Báo cáo lâm nghiệp: "Soil carbon dioxide eﬄux in pure and mixed stands of oak and beech" potx

... TSR in the oak, mixed and beech stands. The annual heterotrophic respiration of the forest floor ac-counted respectively for 68, 74 and 51% of the annual FFR in the oak, mixed and beech stands ... 10.1051/forest:2006098Original articleSoil carbon dioxide efflux in pure and mixed stands of oak and beechMathieu J*, Frộdộric A, Franỗois J,NicolasM, Pierre P`,Quentin PUniversité ... (TSR) was measured in pure and mixed stands of oak and beech and was partitioned into two contributions using theforest floor removal technique: Mineral Soil Respiration (MSR) and Forest Floor...

Báo cáo lâm nghiệp: "Sucrose synthase expression pattern in the rhythmically growing shoot of common oak (Quercus robur L.)" pot

... (2005) 585591â INRA, EDP Sciences, 2005DOI: 10.1051/forest:2005051Original articleSucrose synthase expression pattern in the rhythmically growing shoot of common oak (Quercus robur L.)Rozenn ... incorporation of cDMO as a indicator of organ sink strength in oak, that on the 2nd day, the apex is astronger sink than the other organs [4]. We also localized the SuSy protein in storage tissues of the bud, ... good indicator of the sink strength of an organ [24], the shoot apex on the 2nd day of the flush appears therefore to be the strongest sink of the shoot. This fact is supported by the non-vascular...

Báo cáo lâm nghiệp:" Ring shake in chestnut: Anatomical description, extent and frequency of failures" pdf

... radially into a neighboring ring and then further proceed into the earlywood tissue. This“jumping” from ring to ring could also occur several times in the same ring shake failure, giving the ... processing, and the often observed ring- to -ring jump-ing pattern of shakes lets us presume that the set off mecha-nism leading to this failure has to be related to stresses actingon the standing ... this kind of fracture, which ismainly regulated by the relieving of growth stresses during thetree-felling. Therefore further studies on this topic, with theaim of reducing the risk of ring shake, ...

Báo cáo lâm nghiệp:" Mid-winter ultrastructural changes in the vegetative embryonic shoot of Norway spruce [Picea abies (L.) Karst.]" pdf

... shoot is still insufficient. The aim of this study was to determinewhether changes take place in the submicroscopic structure of the distal part of an embryonic Norway spruce shoot duringwinter dormancy ... (2003) 461466â INRA, EDP Sciences, 2003DOI: 10.1051/forest:2003039Note Mid-winter ultrastructural changes in the vegetative embryonic shoot of Norway spruce [Picea abies (L.) Karst.]Marzenna ... The results presented in this studyprovide data on the period when changes in spruce embryonic shoot were not observed and the period when the changes mayindicate that the winter dormancy of...

Báo cáo lâm nghiệp: "Predicting solar radiation transmittance in the understory of even-aged coniferous stands in temperate forests" ppt

... characteristics, the time since last thin-ning τ and the thinning intensity I were retained for this study. Thin-ning intensity I is defined in terms of basal area, being equal to the ratio of absolute ... since thinning increased (data not shown).Thus the influences of stand age, time since last thinning andintensity of last thinning on extinction coefficient b (relation-ship (2)) were further ... lines: thinning of intensity = 0.5, 3 years ago.Parameter agemax was set at 20 years. Solar radiation in coniferous stand understory 639within 10 m, possible due to the light extinction induced...

Báo cáo lâm nghiệp: "Fertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlings" pot

... articleFertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlingsDouglass F. JACOBSa,b*, Robin ROSEa, Diane L. HAASEa, Patricio ... the poor root development of seedlings fer-tilized at a relatively high rate in this study.We expected increased root proliferation at or above theposition of CRF placement and greater root damage ... likely a function of greater allocation of biomass to shoot relative to root tissues and the reductions in root biomass, first-order lateral -root length, and number of white root tips, which limited...

Báo cáo lâm nghiệp: "Oak decline risk rating for the southeastern United States" ppt

... forests in the Appalachian and Ozark Mountains in the southeastern United States. These combi-nations of landforms and ownership classare dominated by mixed hardwood forestswith ... subregions. These findings led toan hypothesis that oak decline risk rating systems could be developed from standardforest inventory data for predicting the rela-tive ... thatsevere oak decline cases in the southeast-ern United States were associated with lowSI and low SI/AGE but these variablesemerged in the models for NAPP andREGION...

Báo cáo lâm nghiệp: "doubling atmospheric CO concentration on 2 matter distribution and CO exchange of 2 yr growth, dry 2 old sweet chestnut trees (Castanea sativa Mill.)" pptx

... after a 2 wk adaptation period as the slope of C0 2 concentration over time in the wholechamber (Gaudillere and Mousseau,1989). During the two 1 st 2 wk, the C0 2 concentration ... where environmental conditionswere controlled (22 /15°C day-night, 15 hphotoperiod, 50% RH). Whole plant photo-synthesis at 25 0 jlmol-m- 2 s-1 PPFD and dark respiration were ... total dry matter of C0 2 -enriched chestnut plants observedin the growth measurements.Discussion and ConclusionTree species may react differently to ele-vated levels of atmospheric...

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

... be indicative of increased partitioning of carbon intosucrose (starch decreases) and this situa-tion is obviously continued during summer. Class li -specific changes in pool ... based on dry weight) differsignificantly in the levels of starch, TP andF26BP, in that class II needles show adecrease in starch, compared to in- creased amounts of ... situation in class II needles is less straightforward tointerpret.The most interesting change in concen-tration is shown by F26BP. The significant-ly increased amount of this...

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