Báo cáo lâm nghiệp: " The use of ultrasonic detectors for water stress determination in fruit trees" docx
Báo cáo lâm nghiệp: " The use of ultrasonic detectors for water stress determination in fruit trees" docx
... in Thuja occidentalis L.? Ultrasonic acoustic emissions from the sapwood can bemeasured. Plant Physiol. 72, 1094-1099 The use of ultrasonic detectors for water stress determination ... reduction in hydraulic conductivitycould occur. Work is continuing in order toevaluate the technique for assessing plantresponses to drought in the field and as ameans of measuring ... eachrootstock/cultivar combination. Three days later, water was withheld from one more tree fromeach combination, the remainder of the treesbeing retained as well-watered controls....
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Báo cáo lâm nghiệp: "The use of silica sand in micropropagation of woods" pot
... (http://www.pisky.cz) was used in laboratories of the North-Bohemian Museum in Liberec and later also of the Botanic Gardens in Liberec.I consider the following properties as the principal advantages of the described ... favourably in uenced by the actual determination of the acidic environment dur-ing the hydrolysis of agar. e following experiment originated from these possibilities and conjectures.Determining the ... with a pH of 5.6. By the same method, the zero hypothesis was tested for conformity of averages for pH 5.6 and pH 4.5.RESULTSComparing cultures in sand and in agarAfter the completion of cultivation,...
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Báo cáo lâm nghiệp: "The results of manipulated experiments with inoculation of Ips typographus (L., 1758) to spruce trees under various levels" potx
... average depth of entry holes was bigger on trees which were less stressed by a lack of water. e exact mechanism of these relationships between the water stress and the increase of tree resistance ... is to analyze the behaviour of bark beetles on trees under various regime of water stress in declining spruce mono- cultures. Within the frame of which we focus on:– analysis of I. typographus ... on stressed versus unstressed trees;– analysis of I. typographus attacks rate and speed of boring on more stressed versus less stressed trees.METHODOLOGYe effect of water stress on the...
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Báo cáo lâm nghiệp: "The influence of irradiation on the behaviour and reproduction success of eight toothed bark beetle Ips typographus (Coleoptera: Scolytidae)" doc
... competitive in comparison with non-irradiated males in these parameters.Competition for femalesAs the results indicate, the number of mother tun-nels was the highest in the case of 15 Gy irradiated ... shortly prior to the beginning of rearing.Number and sex ratio of the F1 offspring were not identified in this study, because of the low number of emerged beetles in all treatments. ere were ... Slovakia.e use of the sterile insect technique (SIT) for suppressing pest populations was proposed ini-tially by K (1955). Since that time the ef-fectiveness of using the sterile insect...
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Báo cáo lâm nghiệp: "The effect of point application of fertilizers on the soil environment of spread line windrows in the Krušné hory Mts" docx
... practices aimed at the reconstruction of local mountain forests was the inconsiderate use of bulldozer technologies for the preparation of sites for forest stand restoration. In the course of large-scale ... complete spreading of former line windrows was done there for soil re-vitalization (V 2003). Before the windrow spreading started, the windrows in Špičák locality contained ca 750–800 ... liming may be one of the causes of imbalances in the availability of the studied bases. It mainly affected natural processes of humus formation in forest soils and disturbed natural bonds of...
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Báo cáo lâm nghiệp: "The proposal of biotic hazard zones in selected spruce dominated regions in Slovakia" pptx
... km in the E-W direction in the eastern part to 12 km in the N-S direction in the southern part. It is signifi-cantly prolonged in the N-S axis, as a result of the in- tensive spreading of bark ... driven decline is typical of the Kysuce and Orava regions. In the Orava region, the decline was accelerated by windstorm in 2004, causing heavy damage to forests. In contrast to the other two ... management. In contrast, the observed patterns of infestation often reflect such regulations. For exam-ple, the northern part of zone A in the Orava region is located just in the Babia hora...
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Báo cáo lâm nghiệp: "The influence of selected factors on energy requirements for plain milling of beech wood" ppsx
... an increase in cutting speed, when the rise is the most intensive above 30 ms–1 ; an increase in the value of the rake angle causes a decrease in cutting input. So, with regard to the ... difference.Measuring of cutting inputAt experimental measurements of cutting input the common principle of measurement was used based on monitoring changes in the current drawn by an electric motor from the ... optimal, with the lowest cutting input. The cutting input decreases almost linearly with the decreasing angle; with the change of the angle γ from 15° to 20°, a decrease in cutting input by 11.8%...
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Báo cáo lâm nghiệp: " The response of weevil communities (Coleoptera: Curculionoidea) to the altitudinal zones of beech stands" ppt
... decreasing dominance (Table 2). The result of CCA analysis showed the condi-tion convenience for the existence of some weevil species in the researched AZ. In the case of the 3rd AZ the canonical ... cumu-lative variance of the data together (Fig. 1). It is also obvious in the declining character of the ratio of the researched species in investigated AZ (Fig. 2). Gradual in uence was also ... one of the primary preconditions for biogeographical differentia-tion of the landscape, protected territory tending and preservation of forest ecosystems. For deepening the knowledge of the...
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Báo cáo lâm nghiệp: "The role of Hylastes cunicularius Erichson (Coleoptera: Scolytidae) in transferring uropodine mites in a mountain spruce forest" pptx
... overlooked in mountain spruce forests in the Tatra Mountains and, possibly in other mountain areas in Europe too. In the study area, the bark beetle acts as a vector of at least four species of uropodine ... from 0.064 in the valley Bielovodská dolina to 0,108 in Tomanova dolina and 0.145 in Velická dolina, giv-ing the value of 0.103 for the study area as a whole. The rarefaction curve of the pooled ... concerning the transfer of uropodids by H. cunicularius in spruce forests. To clarify the role of H. cunicularius as a vector of phoretic uropodine mites during dispersal in a mountain spruce forest,...
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Báo cáo lâm nghiệp: "The evolution of natural floodplain forests in South Moravia between 1973 and 2005" pptx
... projected against EIV for the moisture of the given species. e fitting of the resulting field of points shows a shift in the species composition of the herb layer. e relation of the species ... factors is the height of the water table. The changing character of some of the sites due to its fluctuation may result in increasing space available for the species of a wider range of environmental ... crucial for the development of level 3. e increasing EIV for the light and moisture of the herb layer are prob-ably caused by the absence of Quercus robur in the open parts of the dampest...
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