Báo cáo lâm nghiệp: " Consequences of environmental stress predisposition to pathogens" pps
Báo cáo lâm nghiệp: " Consequences of environmental stress predisposition to pathogens" pps
... Response of trees to stress depends on the integration of all environmental factors affecting them before, during, and after the stress event, and the influence of those ... occurrence of adverse environmental factors, and their severity depends on the intensity, duration, and frequency of the stress event(s), and the successful attack of...
Ngày tải lên: 08/08/2014, 18:21
Báo cáo lâm nghiệp: " Consequences of increased deer browsing winter on silver fir and spruce regeneration in the Southern Vosges mountains: Implications for forest management" potx
... mor- tality of seedlings due to browsing. Therefore, stand composi- tion was considered as an additional site factor affecting the substitution of fir by spruce. The aim of the study was to assess ... fir-beech forest range. Study forests of Site 1 and 2 con- sist of 30 to 50% spruce, 30 to 60% fir and 0 to 30% beech. At Site 1, the small populations of Roe deer (Capreol...
Ngày tải lên: 08/08/2014, 00:21
Báo cáo lâm nghiệp: " Influence of environmental conditions on radial patterns of sap flux density of a 70-year Fagus crenata trees in the Naeba Mountains, Japan" ppsx
... study utilized data of sap flux density and environmental fac- tors measured from April 20 to November 15, 1999 (cf. Fig. 2). The duration of the growing period was from May 6 to October 29 during this ... hand, allow estimation of the transpiration component of ET in non-homogeneous ter- rain [8, 21]. To obtain estimates of total water use by individual trees, it is necessa...
Ngày tải lên: 08/08/2014, 00:21
Báo cáo lâm nghiệp: "Verification of the food supply to game under conditions of the floodplain forest ecosystem" docx
... 2, the maximum number of converted units of hoofed game for the forested part of the studied area is 54. According to the decision of the Department of Environment of Břeclav MÚ, Ref. No. ... game in the Soutok Game Preserve, the total basic consumption of grass and herb food amounts to 1,159,375 kg, and of food of woody origin to 332,500 kg. us, the production...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: "Utilization of a dynamometric pendulum to estimate cutting forces involved during routing. Comparison with actual calculated values" pdf
... improvement of 30% of the coeffi- cient of determination (R 2 = 0.80) in the relation between pre- dicted cutting forces and routing measurements, and a reduction of 60% of errors sum of squares. ... [9] At the beginning of this study, the aim was to take into account the influence of wood material in the estimation of cut- ting forces involved during routing. It was deci...
Ngày tải lên: 08/08/2014, 00:22
Báo cáo lâm nghiệp: "Variations of construction cost associated to leaf area renewal in saplings of two co-occurring temperate tree species (Acer platanoides L. and Fraxinus excelsior L.) along a light gradient" doc
... variability in the degree of tolerance to shade. The ability of trees to acclimate to shade is important for understanding dynamics of forest succession and determining the fate of juvenile trees during ... of saplings to reduce this energetic requirement would therefore contribute to their overall shade tolerance. The objective of this study was to gain a better under...
Ngày tải lên: 08/08/2014, 00:22
Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx
... than 95% of the variation in the sets of data. The number of fusiform cells in the radial files on the xylem side of the cambium varied with the time of year, increasing to a maximum of about ... numbers of the various cell types in the secondary vascular tissues. Regression analyses led to estimates not only of rates of cell production but also to the basal threshold...
Ngày tải lên: 08/08/2014, 00:22
Báo cáo lâm nghiệp:"Predicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part II: Computation of macroscopic properties and microscopic stress fields" pdf
... co-ordinate system, the aim of homogenisation is to derive the local problem in order to be Figure 1. Principle of homogenisation: Part II of this paper is devoted to the calculation of the macroscopic ... (3) According to the double coordinate system, we can derive the following rule for the spatial derivative: . (4) Applying this rule to equation (1b) leads to an asympto...
Ngày tải lên: 08/08/2014, 01:21
Báo cáo lâm nghiệp: " Effects of tree species on understory vegetation and environmental conditions in temperate forests." pps
... vegetation specific to a region. It is important to study the effect of over- story species on understory species because ground flora, when it is significantly present, plays a role in the functioning of for- est ... It was not possible to find sites with stands of the same age. 2.2. Methods 2.2.1. Understory In the centre of each stand of each site, a sample plot with a sur...
Ngày tải lên: 08/08/2014, 01:21
Báo cáo lâm nghiệp: "Influence of exogenous L-proline on embryogenic cultures of larch (Larix leptoeuropaea Dengler), sitka spruce (Picea sitchensis (Bong.) Carr.) and oak (Quercus robur L.) subjected to cold and salt stress" pdf
... introduction of stress tolerance into forest species, and their subsequent mass propagation [21]. Acknowledgments: We would like to thank Dr. David Thompson of Coillte Research Laboratory, Newtownmountkennedy, ... approximately to the amount of proline added to each culture. 4. DISCUSSION Exogenous proline has been shown to have a positive effect on recovery from cold stress...
Ngày tải lên: 08/08/2014, 01:22