Báo cáo lâm nghiệp: " Prevision of the bending strength of timber with multivariate statistical approach" pdf

... 1. The slope is calculated in the linear range of the curve (approxi- mately 30% of the ultimate strength) . The bending strength is derived from the load at failure (the ... used to increase the re- liability of such techniques for industrial ap- Original article Prevision of the bending strength of timber with a multivar...

Ngày tải lên: 08/08/2014, 18:21

... (about 1 m) from the stem of five selected trees. e cylinder of the soil probe used for this purpose had the inner diameter of 6 cm and the height (depth of space sampled) of 15 cm. e probe ... the total weight of root dry matter. After analyses, all prepared roots were dried in the kiln (24 hours at the temperature of 105°C) and weighed with the accurac...

Ngày tải lên: 07/08/2014, 03:22

... factors, other than the effects of shade, were small so that the major variable affecting sapling growth was the quantity of light (L 1969). In full light, the lag between monthly hours of sunshine ... insects, and frost da- mage. During the breaking of dormancy in spring, the removal of inhibitory guanidino compounds provides sources of N for the renewed synt...

Ngày tải lên: 07/08/2014, 10:21

... 53 kg of N, 5 kg of P, 22 kg of K, 26 kg of Ca and 4 kg of Mg. The removal of biomass in areas previously degraded by acid deposition may result in the deficiency of Ca and Mg because of their ... kg of K, 26 kg of Ca and 4 kg of Mg. Before thin- ning (at the age of 16 years), the plot with thinned stand reached 100–110% of aboveground biomass and nutri...

Ngày tải lên: 07/08/2014, 10:21

... frequency of cpDNA haplotypes within Q. ilex populations and phylogenetic reconstruction of the relationships among haplotypes using statistical parsimony. Size of the pies indicates the number of individuals ... Sicily and particularly in the south-eastern part of the island, close to the Etna region. Haplotype 6 characterises the south-western part of Sicily, in...

Ngày tải lên: 08/08/2014, 00:21

... meas- urements. Within the analysis of the hypothesis of the dependence of dieback of subdominant trees standard parameters of differences between upper and lower limits were used. If the population ... species there. In the next years, the proportion of larch slightly decreased, nevertheless, the species has taken up steadily 35% of the reduced stand area in...

Ngày tải lên: 07/08/2014, 03:22

... mixed stand of spruce with beech. The highest accumulation of forest floor was in the stand of larch with beech (52.6 t/ha). The lowest accumulation was found in the unmixed stand of beech (22.0 ... organic horizon the major- ity of the C/N ratio values occurring within the limits 10–100, in mineral horizons within the limits 10 to 30. However, the evalua...

Ngày tải lên: 07/08/2014, 03:22

... at the beginning of the 20 th century might be a reaction to the closure of pasturing and timber harvesting (V 1994) in conjunction with the long-term effect of spruce monocultures, with ... which can result in the growth depression of trees. Growth depression of Norway spruce was detected in the Bavarian Forest (W, E 2004) and the northern part...

Ngày tải lên: 07/08/2014, 03:22

... and also in the other types of low altitude forests (e.g. Z 1973). In all of them Cg is one of the dominant species. In our study we concentrated on the study of the population of this species ... is RB with the mosaic of forests of various age catego- ries as well as small open areas. is was the locality with the highest abundance after the seed ye...

Ngày tải lên: 07/08/2014, 03:22

... al. 2007). As to the dynamics of abundance during the six years of our study the years 2002, 2004 and 2007 seem to be similar. As the crop of seeds in the forests varied in the particular years, ... amount of mast was deter- mined. e plots were selected randomly in the oak stand and the number of acorns was determined on each of the plots. e acorns were the...

Ngày tải lên: 07/08/2014, 03:22