Báo cáo lâm nghiệp: "The influence of selected factors on energy requirements for plain milling of beech wood" ppsx

... inoculation of Ips typographus (L., 1758) to spruce trees under various levels of water stress M. T, O. N Faculty of Forestry and Wood Sciences, Czech University of Life Sciences ... Republic ABSTRACT: Manipulated experiments with males of Ips typographus (L., 1758) were conducted in spruce stands in north-western Slovakia. Some...

Ngày tải lên: 07/08/2014, 03:22

... of irradiation on the behaviour and reproduction success of eight toothed bark beetle Ips typographus (Coleoptera: Scolytidae) M. T 1 , J. V 2 1 Faculty of Forestry and Wood Sciences, ... Slovakia ABSTRACT: Irradiation experiments on Ips typographus (L., 1758) with doses of 15 and 30 Gy (cobalt 60) were con- ducted in 2006. e effect...

Ngày tải lên: 07/08/2014, 03:22

... was used in part as liquid with sand (25 cm 3 sand + 20 ml solution), in part reinforced by heating 6g of agar in a 1 l medium. Cultures were incubated for 6 weeks with a daily lighting period ... substances. White silica sand marked PR 21 from the sandpit Provodín near Česká Lípa (http://www.pisky.cz) was used in laboratories of the North-Bohemian Museum in Libere...

Ngày tải lên: 07/08/2014, 03:22

... that the fine root ratio is stable at least in the first growing period of new plantation and the best growing plants have about the same fine root ratio as the poorly growing ones. Even the regression ... explaining 92% of the relationship. An adequate proportion of fine roots (thinner than 2 mm) in the root system is another important parameter of p...

Ngày tải lên: 07/08/2014, 03:22

... occurrence of beech we can observe that on the converted plots the domination of Uropo- dina mites was increased and domination rate of Parasitidae mites was decreased. Similar results of the reaction ... reaction of this group of mites to increas- ing amount of broadleaves in tree-stands were presented in “common-garden” forest experiment (S 2007). Th...

Ngày tải lên: 07/08/2014, 03:22

... were observed mainly in regions exposed to the heavy deposition e effect of point application of fertilizers on the soil environment of spread line windrows in the Krušné hory Mts. D. V 1 , ... scarification the top -soil horizons were moved into line windrows, which caused marked degradation of the soil environment. e present revita...

Ngày tải lên: 07/08/2014, 03:22

... of biotic hazard zones in three spruce dominated regions in Slo- vakia; (3) Proposal of zone-specific forest protection mea- sures. Study regions ree regions with different kind of spruce decline ... Descriptive statistics of data on accidental felling of spruce (m 3 of felled volume) used for the proposal of biotic hazard zones in three inves...

Ngày tải lên: 07/08/2014, 03:22

... information on the given problems. Energy requirements were assessed on the basis of measurement and evaluation of electric input e influence of selected factors on energy requirements for plain ... of selected factors of energy require- ments at plain milling of beech wood on cutting input as well as on basic technological parameters v c...

Ngày tải lên: 07/08/2014, 03:22

... System. e response of weevil communities (Coleoptera: Curculionoidea) to the altitudinal zones of beech stands J. B Faculty of Forestry and Wood Technology, Mendel University of Agriculture ... is impossible to define the outline of the occurrence of the found spe- cies. Many faunal researches suggest the possibility of the occurrence of...

Ngày tải lên: 07/08/2014, 03:22

... importance of the passive transfer of uropo- dine mites assisted by H. cunicularius cannot be overlooked in mountain spruce forests in the Tatra Mountains and, possibly in other mountain areas in ... e role of Hylastes cunicularius Erichson (Coleoptera: Scolytidae) in transferring uropodine mites in a mountain spruce forest B. K,...

Ngày tải lên: 07/08/2014, 03:22

... reaction Nutrients 0.3 –0.6 –1.0 1.0 Fig. 2. Relation between the proportion of Picea abies and other variables including EIV (CCA with the proportion of Picea abies as the only environmental ... based on comparing the composition of herb species within three groups of relevés. e groups are created with reference to the proportion of Picea abies in tree...

Ngày tải lên: 07/08/2014, 10:21

... 10.1051/forest:2005015 Original article The influence of different overstory removal on planted spruce and several broadleaved tree species: Survival, growth and pine weevil damage during three years Magnus LÖF a *, ... herbivory from Pine weevils on early growth and survival in different tree species. Sec- ondly, to compare the long-...

Ngày tải lên: 08/08/2014, 00:21

... H., Seasonal variations of glutathione reductase and glutathione in leaves and leaf buds of beech trees (Fagus sylvatica L .) , Phyton 32 (199 2) 99–102. [31] Polle A., Rennenberg H., Photooxidative ... 10.1051/forest:2003005 Original article The influence of microclimate and tree age on the defense capacity of European beech (Fagus sylvat...

Ngày tải lên: 08/08/2014, 01:21

... LAI estimates (Bur- ton et al, 1991). Recently, starting from the assumption that the total amount of radiation intercepted by the canopy layer of a stand depends on the ... only the struc- ture and the development of the stand (growth of the understory, natural regener- ation, etc) but also light and rain interception, vertical...

Ngày tải lên: 08/08/2014, 18:21

... signifi- cant effect of acid rain /mist upon cuticle structure and/ or resistance. The lack of The influence of acid mist upon transpiration, shoot water potential and pressure—volume ... expected to influence plant water status. This paper presents some of the results of a detailed study of the influence of acid mis...

Ngày tải lên: 09/08/2014, 04:20