Báo cáo lâm nghiệp:"Poplar plywood resistance to wood decay agents: efficacy of some protective treatments in the light of the standard ENV 12038" ppt

... 83–89 © INRA, EDP Sciences, 2003 DOI: 10.1051/forest: 2002077 Original article Poplar pl ywood resistance to wood decay agents: efficacy of some protective treatments in the light of the standard ENV ... time. Analyzing the different plywood protections, the combination of resin coating and edge painting did not lead to a significant improvement in...

Ngày tải lên: 08/08/2014, 01:21

... Differences in the properties of the particular sampling points and the fact that the in uence of soil heterogeneity on the specificity of forest stand cannot be fully neglected complicate the interpretation ... connection of roots with the soil as well as with the other tissues of the plant is related to soil water-holding capacity and to the potentia...

Ngày tải lên: 07/08/2014, 03:22

... 1992). Significant differences in the intensity of damage to trees at clearings were found in dependence on the structure of the herbaceous cover. According to foresters, the clearings free of ground vegetation ... dynamics of rodents in forest environment, their feeding behaviour and the damage they cause. At the beginning of the research, we conducted a s...

Ngày tải lên: 07/08/2014, 03:22

... e information on tree biomass is required to assess the amount of carbon held in trees, which in turn represents the basis of the assessment of carbon stock held in forests. is leads to the ... three parameters of the equation. However, it is to note that in allometric studies the nonlinear regression analysis is often avoided using the logarithmic l...

Ngày tải lên: 07/08/2014, 10:21

... the height of the tree at the end (H 2 ) and at the be- ginning (H 1 ) of the five year period, as well as the difference between the age at the end of the period (T 2 ) and the age at the beginning ... for the estimated age. The distribution of the age of the dominant strata and the site index within the for- est area can be seen in Figure 4. The...

Ngày tải lên: 07/08/2014, 16:20

... basal area (G) of the living pines in the inventory plots using the initial ver- sion of the diameter growth models (A), using the new version of the diameter growth models (B). In each case, the fixed ... (thin lines indicate the standard error of the mean). Figure 2. Measured and predicted 10-year changes in the tree basal area (g) of living P. sylvestr...

Ngày tải lên: 08/08/2014, 01:21

... 1966; Maze, 1968). The focus of this paper is to examine aspects of the water relations of these three oak species native to the intermountain west and of their hybrids under ... in the Cottam Oak Grove at the Uni- versity of Utah for approximately 30 years, and during that interval some of the lowest winter and spring air t...

Ngày tải lên: 08/08/2014, 18:21

... density of inoc- ulation points [30]. When inoculated into the bole of Scots pine (Pinus sylvestris), the fungus Lep- tographium wingfieldii, associated with the bark beetle Tomicus ... and susceptibility to L. wing- fieldii. A last but interesting result of our study lies in the stability of the length of the induced reaction zone in...

Ngày tải lên: 09/08/2014, 04:20

... characteristics independently, in order to evaluate their relative in uences on wood density. For the first set of simulations, all the variables in the model were fixed to values they take at the beginning of ... variance. The conversion factor of MMD a to CWP (with the intercept set to 0) was 1. The ratio between CWP and MMD a decreased within the first hal...

Ngày tải lên: 07/08/2014, 16:20

... encompasses the defini- tion of both the debarking cycle for each tree in the land unit and the thinning regime. The prescription simulator may consider three debarking models. The inputs to the first ... extending the planning horizon will not impact the effectiveness of this decision support tool. The interpretation of inventory data demonstrated the effec-...

Ngày tải lên: 08/08/2014, 00:22