Báo cáo lâm nghiệp: "Importance of water consumption for cal

Báo cáo lâm nghiệp: "Importance of water consumption for calcium utrition of tre" pptx

... the! importance of calcium for physiological processes, including resis- tance to parasites. Importance of water consumption for calcium nutrition of trees A. Vigouroux C. Bussi 2 J.F. ... necessary to determine the respective role of water and calcium avail- ability in the variations of the calcium content of the trees. For this purpose...

Ngày tải lên : 09/08/2014, 04:20

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Báo cáo lâm nghiệp: "Research on individual parameters for cutting power of woodcutting process by circular saws" docx

... J. FOR. SCI., 56, 2010 (6): 271–277 – forces necessary for cutting the mass of a work- piece by a cutting-wedge during the deformation of a mass in the surroundings of a cutting edge, – forces ... the value of individual parts of force F is quite diﬃcult and depends on many aspects. e part of force F in the direction of cutting feed F c is called cutting force and it is...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "A digital photographic method for 3D reconstruction of standing tree shape" ppt

... information is then combined and used to reconstruct the initial 3D shape of the tree. The accuracy of this approach was quantiﬁed by taking two measurements of the coordinates of a series of ... the comparison indicated a good level of precision for the ﬁrst 12 m of the stem (interval of uncertainty ± 7.2 mm) and lower for heights above 12 m (interval of uncertainty ± 2...

Ngày tải lên : 07/08/2014, 16:21

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Báo cáo lâm nghiệp: "Changes in air quality in different phases of forest management process in a sub-mountain beech ecosystem (West Carpathian Mts.)" pdf

... Meteorological Journal, 3: 9–18. 368 J. FOR. SCI., 55, 2009 (8): 368–375 JOURNAL OF FOREST SCIENCE, 55, 2009 (8): 368–375 Forest ecosystems are damaged by a range of harmful agents acting synergically. ... quality in diﬀerent phases of forest management process in a sub-mountain beech ecosystem (West Carpathian Mts.) D. K Institute of Forest Ecology, Slovak Academy of Sc...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Available nitrogen in the surface mineral layer of Serbian forest soils" docx

... is usual for forest soils. Except the soil under the black locust forest, the ammonium form of nitrogen is the dominant form of easily available mineralN.  e highest amounts of NH 4 + –N ... soil and forest ﬂ oor of contrasting types of boreal mixedwood forests. Canadian Journal of Forest Research, 36: 112–122. J J.H., R J., B S., D E. (2004): Eﬀ...

Ngày tải lên : 07/08/2014, 10:21

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Báo cáo lâm nghiệp: "Litter production in a Quercus suber forest of Montseny (NE Spain) and its relationship to meteorological conditions" pptx

... the production of litterfall components from 1996 to 2002. The production of litterfall registered during a seven-year period in the cork-oak forest of Montseny gave an average of 477 ± 147 g ... related to any of the remaining ten vari- ables (P >> 0.05) and for this reason it appears in the centre of the factor plot. The largest factor loadings for the two axes were...

Ngày tải lên : 07/08/2014, 16:20

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Báo cáo lâm nghiệp: "Genetic variation and genotype by environment interactions of juvenile wood chemical properties in Pinus taeda " pps

... M.C c a Department of Forestry and Environmental Resources, North Carolina State University, College of Natural Resources, Raleigh, NC 27695-8002, USA b Forest Sciences Centre, University of British ... number of sites (t = 4), b is the number of blocks within sites (b = 6), p is the number of parents (p = 6) and n is the harmonic mean number of trees within plot (n = 2.83)....

Ngày tải lên : 07/08/2014, 16:20

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Báo cáo lâm nghiệp: "Genetic variability and divergence among Italian populations of common ash (Fraxinus excelsior L.)" ppt

... marketing of forest reproductive material. One of the most important feature of the act is the deﬁnition of Region of Provenance as “ the area or group of areas subjected to suﬃciently uniform ecological ... such as the level of in- breeding. This information is of basic importance for the def- inition of Italian Regions of Provenance for common ash, al- though a deepe...

Ngày tải lên : 07/08/2014, 16:20

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Báo cáo lâm nghiệp: "End-use related physical and mechanical properties of selected fast-growing poplar hybrids (Populus trichocarpa × P. deltoides)" potx

... http://dx.doi.org/10.1051/forest:2007040 End-use related properties of poplar wood 627 Table VI. Density (kg/m 3 ), modulus of elasticity and modulus of rupture (N/mm 2 ) for a 7-layer plywood for each of the selected ... increasing wood de- mands. Since 1948, research performed at the former Institute for Poplar Cultivation (currently the Institute for Nature and For- est R...

Ngày tải lên : 07/08/2014, 16:21

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Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx

... of the fibres within an annual increment of secondary phloem tissue raises a problem of how best to sample them for analysis. Their dis- tribution suggests that the development of one group of ... Thresholds for xylem vessel development have been recorded in a previous publication [16]. 3.4. Fusiform cambial cells Numbers of fusiform cambial cells, as recorded from cross- sect...

Ngày tải lên : 08/08/2014, 00:22

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