Báo cáo lâm nghiệp: "The effects of thinning treatments on density, MOE, MOR and maximum crushing strength of Pinus brutia Ten. wood" ppt

... 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

... In 1949, the Supported by the Ministry of Education, Youth and Sports of the Czech Republic, Projects No. VaV-SM/6/153/05 and MSM 6293359101. e evolution of natural floodplain forests in South ... relevés. The increasing trend in the number of recorded species may, however, also mean the movement of some of the ecologi- cal factors. In the case of floodpl...

Ngày tải lên: 07/08/2014, 03:22

... were included in the clusters together with trees from unthinned control plots 1c. Variability of growth response of pine stands to climate characteristic in relation to thinning Variability of ... thinned stands (variant 4t) showed the higher variability of diameter growth response in comparison with those from control stands. DISCUSSION  e respon...

Ngày tải lên: 07/08/2014, 10:21

... approach has proved very interest- ing and useful in the case of complex decline syndromes where multiple abiotic (including drought) and biotic (pathogens and insects) factors are involved [80, 85,106, ... PROCESSES AND MECHANISMS Theoretically, three main types of drought- disease interac- tion can be expected: – A direct effect of drought on pathogens; – Indirect effe...

Ngày tải lên: 07/08/2014, 16:20

... from the similarity of the detected changes with those caused by drought. This part gives an overview of the state of the art in the use of remote sensing for detecting and monitor- ing forest ... are: to briefly review the existing sources of remote sensing data and their potential to detect drought damage; to review the remote sensing applica...

Ngày tải lên: 07/08/2014, 16:20

... online at: c  INRA, EDP Sciences, 2007 www.afs-journal.org DOI: 10.1051/forest:2007024 Original article The effects of thinning treatments on density, MOE, MOR and maximum crushing strength of ... low. In addition, the seed source of samples taken from two plantations areas was Thinning effects on Pinus brutia wood properties 475 [33] Larson P.R., Wood fo...

Ngày tải lên: 07/08/2014, 16:21