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

... 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

... 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

... 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

... is usual for forest soils. Except the soil under the black locust forest, the ammonium form of nitro- gen is the dominant form of easily available miner- al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

... 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 cen- tre of the factor plot. The largest factor loadings for the two axes were...

Ngày tải lên: 07/08/2014, 16:20

... 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

... 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

... 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

... 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