Báo cáo lâm nghiệp: " The applicability of the Pipe Model Theory in trees of Scots pine of Poland" ppsx

... confirmed by the study of N (1961), who stated that the percentage of heartwood in Scots pine decreased with an increase in the length of the live crown and an increase in the widths of the ... the incidence of pipes conductively inactive or periodically inactive. In the dynamic model of crown structure it would be necessary to consider the...

Ngày tải lên: 07/08/2014, 10:22

... i.e. in the more northern regions. In the 3-year developmental cy- cle the first moulting takes place as soon as in the year of hatching and already in the advanced sec- ond stage the larvae winter. ... on the effect of aerial interventions in 2003 on an area of 508 ha against the beetles at the time of swarming were not evincible. In 2003 when the M....

Ngày tải lên: 07/08/2014, 03:22

... clematis as dominant species in the herb stratum. ere were two lines of traps led in a trees cropping mast oak forest, one line in a young oak stand, one in a spruce forest, one in a pine forest ... dominated in these habitats. On the other hand, the populations of insectivores were very low, Crocidura leucodon and C. suaveolens be- ing interesting species. RB w...

Ngày tải lên: 07/08/2014, 03:22

... than the sum of the values of their parts (H, K 2005). At the end of the 70s and at the begin- ning of the 80s of the 20 th century, the principle of plywood allowed the origin of OSB ... speed in the process of testing. e loading speed is such that maximal loading will be attained at (60 ± 30) s. Deflection in the middle of the samp...

Ngày tải lên: 07/08/2014, 04:20

... e frequency of the sanding paper replacement is Table 1. e initial and final point of abrasion in samples without glass fibres Sample Initial point of abrasion (rpm) Final point of abrasion ... recorded again. e initial point of abrasion occurs when: – the first disturbance of the printed picture is vis - ible in the printed decoration; – in single-coloured deco...

Ngày tải lên: 07/08/2014, 10:21

... the individual additional examination of a large num- ber of branches which would have considerably enlarged the survey. The risk of fork emergence of 71.7% obtained in plot P1, in the case of ... originating from the same point. The forks observed in this study were those which emerged on the annual shoot of the principal axis of each plant in 1994. Acco...

Ngày tải lên: 07/08/2014, 16:20

... relevant targets. In the example given, and to illustrate the method, the char- acterisation of the disc included the annual ring limits, the outline of the bark, the external limit of the black heart, and the ... coordinate system, all coordinates of the measured points in the local coordinate system can be obtained in the global coordinate system. AN...

Ngày tải lên: 08/08/2014, 01:21

... carbohydrate reserves, including the sugars that are used for protection against frost during the winter [32]. Excess N may also cause buds to break earlier and delay the onset of dormancy, increasing the risk of ... winter frost as possible predisposing factors of oak decline in northern Germany, in: Luisi N., Lerario P., Vannini A. (Eds.), Recent advances in stu- dies on...

Ngày tải lên: 08/08/2014, 01:21

... quite well by the model in (3). The non-linear model explained over 98% of the variation within individual power spectra. Residual variances declined initially rapidly with increasing frequency ... to the variance of a spectra. The choice of r–1 degrees of freedom in the numerator of the F-ratio test instead of 2 was adopted to keep the experiment-wide erro...

Ngày tải lên: 08/08/2014, 01:22

... dynamics of cone production in red pine. Oecologia 33, 327-349 of abiotic factors (85% of the losses), but 11.8% of the conelets aborted following the attack of P atomarius. ... graines Piussi P (1994) Mixed Pinus cembra stands on the south- ern slope of the Eastern Alps. In: Proceedings — International Workshop on Subalpine...

Ngày tải lên: 08/08/2014, 18:21