Báo cáo lâm nghiệp: "Influence of cross section dimensions o

Báo cáo lâm nghiệp: "Influence of cross section dimensions on Timoshenko’s shear factor – Application to wooden beams in free-free flexural vibration" ppsx

... 31 9–3 21 © INRA, EDP Sciences, 2006 DOI: 10.1051/forest:2006011 Original article Influence of cross section dimensions on Timoshenko’s shear factor – Application to wooden beams in free-free flexural ... effect of the cross section into account. Numerical shear factor values are calculated according to variations in the height/width ratio of...

Ngày tải lên : 08/08/2014, 00:22

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Báo cáo lâm nghiệp: " Influence of temperatures and precipitation on radial increment of Orlické hory Mts. spruce stands at altitudes over 800 m a.s.l" ppt

... natural factors aﬀecting the tree growth. ese natural factors are permanently stored in the structure of the created biomass and so trees monitor the state of the environment in the structure of ... values of correlation coeﬃcients of the regional residual index tree-ring chronology with the average monthly temperatures from May of the previous year (P) to August of...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Influence of light and competition on crown and shoot morphological parameters of Norway spruce and silver fir saplings" doc

... and the simplest indicator of the light conditions in which the tree is growing. Our results indicate that a value of ADR = 1, corresponding to a relative irradiance of about 1 5– 20%, may be used ... at 1-min inter- vals, from 7.00 to 17.00, on 10 different days selected at the beginning, middle and end of the growing season on both clear and overcast sky conditions in...

Ngày tải lên : 08/08/2014, 00:21

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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

... 3.2. Influence of proline in relation to concentrations of NaCl Figure 2 shows the growth rate of larch embryogenic cultures grown in varying concentrations of NaCl. There was a Figure 1. Influence ... filtration on 200 µm nylon mesh and resuspension. 200 mg samples of cells were analysed in triplicate. The free proline concentration in the cells was determined using...

Ngày tải lên : 08/08/2014, 01:22

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Báo cáo lâm nghiệp: " Conversion of even aged forest managed under the system involving coupes to selection forest in Klepačov J. Šilhánek" docx

... be focused on the sustained continuity of regenera- tion processes and on the diﬀerentiation of the lower storey of the forest stands under conversion. e existing species composition as expressed ... results of our study demonstrated that the application of the selection system of management under natural conditions of oak-beech and beech forest altitudinal vegetation...

Ngày tải lên : 07/08/2014, 04:20

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Báo cáo lâm nghiệp:"Effects of field vegetation control on pine weevil (Hylobius abietis) damage to newly planted Norway spruce seedlings" ppt

... vegetation control and pine weevil damage 671 colonisation following scarification is an important factor to consider when attempting to reduce pine weevil damage. The vegetation cover had only ... as in this investigation. Pine weevils may avoid open mineral soil areas because of the risk of overheating during sunny periods [1] or because of the higher risk of predation on...

Ngày tải lên : 08/08/2014, 01:21

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Báo cáo lâm nghiệp: " Influence of stand density, thinning and elevated CO2 on stem wood density of spruce" pot

... sections from the tree top to the t 3 section, SWD of t 5 disc to sections t 4 + t 5 , SWD of t 7 disc to sections t 6 + t 7 and SWD of disc from 1/10 of H to internodial sections t 8 ... calculation was based on the length of internodial section and its middle cross- sectional circle area measurement. SWD of tree was calculated as the weighted average...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Influence of pulverized limestone and amphibolite mixture on the growth performance of Alnus incana (L.) Moench plantation on an acidified mountain site" potx

... deﬁciency of K in relation to Ca according to the classiﬁcation by K and V  B (1995) in both variants during the period from 2002 to 2004. DISCUSSION e initial plantation losses in ... decrease in height during the winter period through Table 6. Proportion values of nutrition elements to N (=100%) in dry mass of leaves (the 1 st section of the...

Ngày tải lên : 07/08/2014, 04:20

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Báo cáo lâm nghiệp: " Influence of a planting hole application of dolomitic limestone powder and basalt grit on the growth of Carpathian birch (Betula carpatica W. et K.) and soil chemistry in the air-polluted Jizerské hory Mts." pptx

... the K cations, in contrast to liming, surely participated in it. e increased CEC as a result of liming and also basalt grit application is in line with the expectations and ﬁndings of other ... consequence of silicate weathering. In the 0–1 0 cm horizon of the limestone variant, the increased content of exchangeable Ca and Mg is in accordance with expectations a...

Ngày tải lên : 07/08/2014, 10:22

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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

... was monitored continuously throughout the growing season using the heat dissipation method according to Granier [4, 5]. Heating of the upper probe was carried out along a 20 mm long winding in ... quantities of precipitation falling as snow in winter, leading to snow cover of three to four meters. A strong seasonal pattern in summer precipitation, however, often reduces wate...

Ngày tải lên : 08/08/2014, 00:21

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