Báo cáo lâm nghiệp: "Antioxidant properties of wood extracts and colour stability of woods" pps

... under irradiation. Poplar wood was impregnated with extracts of other woods; on Figure 12, we report the colour variation of impregnated poplar wood as a function of the colour variation of woods the extracts of which ... links between wood extracts and colour stability of wood, we have measured, for the woods the extracts of which have been studied abov...

Ngày tải lên: 07/08/2014, 16:20

... distribution of trees, and vertically in their height dif- ferentiation. L (1999) adds to these attributes the amount and the form of dead wood. e hori- zontal distribution of trees in ... Slovak Research and Development Agency of the Ministry of Education of the Slovak Republic, Project No. 0082-06. A change in structural diversity and regeneration processes...

Ngày tải lên: 07/08/2014, 10:22

... temperature and chemical effects on wood stability. Part 2. The effect of heat on the softening of radiata pine, Wood Sci. Technol. 19 (1985) 57–66. Strength properties of thermally modified softwoods ... mechanical properties of heat treated wood have been discussed. The effect of natural defects, such as knots, resin pockets, abnormal slope of grain and reaction wood...

Ngày tải lên: 07/08/2014, 16:21

... Kysuce and Orava re- gions in directions of the highest variability of site and stand conditions. Sample plots approximately 1 ha in size and rep- resentative of the surrounding forest stand were ... position towards the focus of biotic pest activity, stand age, and the proportion of spruce in a given stand.  e fourth Table 2. Forest damage classifi cation and assignme...

Ngày tải lên: 07/08/2014, 10:21

... E Department of Forest Protection and Wildlife Management, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic ABSTRACT: The density of red deer in the area of forest ... development and management of game popula- tions (M et al. 2001). Methods of counting faecal pellets are relatively cheap and quick. How- ever, the know...

Ngày tải lên: 07/08/2014, 10:21

... the estimates of N and G. The data represent a wide range of stand ages and stand values such as H 100 , G, N, and D g (Tab. I, Fig. 1). 2.2. Model development Any number of stand variables may ... tests of model bias included simultaneous F-tests for unit slope and zero intercept of the linear regression of observed versus predicted data [9]. Predictive performance and...

Ngày tải lên: 07/08/2014, 16:21

... particular duration of rainfall and amount of precipitation since both physical and terrain conditions of watershed are considered constant. erefore when the watershed changes in terms of these stable ... reflecting the devel- opment of regenerated forest stand. Under such conditions, the fluctuation of runoff can be related to the loss and restoration of both intercep...

Ngày tải lên: 07/08/2014, 10:21

... needs of the mu- nicipality [39]. The institution of the “Consorzio Forestale Alta Valle Susa” and more stringent regulations on the separation of grazing of domestic ungulates and forest land ... beginning of a synchronous increment at the TL and at the FL as confirmed by a significant correlation between the TL and the SF chronologies (Fig. 3 and Tab. III). Human land-use,...

Ngày tải lên: 07/08/2014, 16:20

... 11 measures of wood density may have been taken be- fore the formation of the decay and may be more indicative of wood susceptibility to decay. The combination of the chemical wood properties ... Standard, Klason lignin in wood and pulp, Australian Pulp and Paper Industry Technical Association, Appita Standard P11s, 1978. [3] Appita Standard, Organic solvent extractive...

Ngày tải lên: 07/08/2014, 16:20

... thick layer of sand, clay and mixed rubble. Hardwood cuttings (25-cm long) were planted in a double-row de- sign with alternating inter-row distances of 0.75 m and 1.5 m, and a spacing of 0.9 m ... as indicators of taxon of the genotypes, and as determinants of biomass production, and (2) to test the robust- ness of these relationships for two canopy positions. 2. MATE...

Ngày tải lên: 07/08/2014, 16:21