Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx
Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx
... 14-04-1999. The vertical and horizontal lines in the graph represent the threshold values for the accumulation of the indicated secondary vascular cell types. For periclinal divisions in the cambium, and ... estimated in the two direc-tions. In the first case, fusiform cells were counted along the radial files in the xylem portion of the cambium (i.e., to the inside of the cambial initials). In the second ... s.e.) of environmental variables involved in the production of the various cell types in the secondary vascular system of hybrid aspen stems. α is the elemental rate of cell number increase in relation...
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Báo cáo lâm nghiệp: "Predicting the vertical location of branches along Atlas cedar stem (Cedrus atlantica Manetti) in relation to annual shoot length" pdf
... height of insert point of the highest branch and the height of insert point of the branch of interest). In every annual shoot of the stem, the branches were ordered from the top to the base according ... hr is the calculated height of insert point of the branch to the pith, hm is the measured height of insert point of the branch to the trunk, ri+1is the radius of the stem measured below the branch ... properties and are a drawback for most of wood trans-formations and valorization processes. The size and the spatialarrangement of the knots are very often used in the gradingrules of softwood...
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Báo cáo lâm nghiệp: "Predicting the potential distribution of Sirex noctilio (Hymenoptera: Siricidae), a significant exotic pest of Pinus plantations" pot
... within the shaded area(Jianghua Sun, 2004, unpublished data).126 A.J. Carnegie et al.There are large areas of forests of P. massoniana in the south-east of China and of Larix gmelinii in the ... plantations in these regions is inev-itable. The continued use of the Sirex Management Strategy[16] will reduce the economic impact of this pest in these coun-tries. For countries in South America and ... Currently, quarantine measures restrict the importation of infested pine logs into Queensland, specificallyaimed at reducing the chance of S. noctilio establishing in thatstate. Plantations in Western...
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Báo cáo lâm nghiệp:"Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire" doc
... different thermal chocks and control situation. Control 50ºC 75ºC 100ºC 125ºC1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min10 min 15 minHalimium ... from the boreal region in northern and eastern areas to the Mediterranean mountains in the south-ern part of the continent. An accurate assessment of the regen-eration process of these stands ... northern Spain. The seeds of the shrubspecies were obtained from shrub formations that represent Scotspine undergrowth in northern Spain (León Province and Palenciaprovince). After eliminating...
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Báo cáo lâm nghiệp: "Molecular markers provide evidence for long-distance planting material transfer during plantation establishment of Dalbergia sissoo Roxb. in Nepal" pot
... disease of unknown cause in the recentpast, and phenotypic characteristics such as stem form and branching habit are often inferior in plantations. The origin of D. sissoo plantations in Nepal ... describedby Weising and Gardner [14] using their universal primers ccmp-6,ccmp-7, and ccmp-10. The preparation of the PCR-mix and the sepa-ration and visualization of the fragments followed the procedures ... locus. The susceptibility of plantations to a die-back disease and the frequently disappointing growth and stem form of D. sissoo in plantations in Nepal have been explained by the use of pre-sumably...
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Báo cáo lâm nghiệp: "Predicting solar radiation transmittance in the understory of even-aged coniferous stands in temperate forests" ppt
... Concerning thinning characteristics, the time since last thin-ning τ and the thinning intensity I were retained for this study. Thin-ning intensity I is defined in terms of basal area, being ... since thinning increased (data not shown).Thus the influences of stand age, time since last thinning and intensity of last thinning on extinction coefficient b (relation-ship (2)) were further ... 7 stands for larch (at the same age of 92 years) and 20 stands for Scots pine, i.e., a proportion of 13% of all the stands studied. The stands were not all thinned. For stands that were thinned...
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Báo cáo lâm nghiệp: "On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic" potx
... end of April to the end of October and emptied in two-week or one month intervals during the period 2001–2006. e sawflies were determined according to the key of V (2002) and the ... liv-ing on spruce in mountainous regions and (ii) to compare species composition and abundances of these species in cultural and near-natural spruce forests.MATERIAL AND METHODSe web-spinning ... pest in forestry. Several serious outbreaks are known in Central Europe from the end of 19th century and the beginning of the 20th century (E 1942; P-W 1982). In the...
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Báo cáo lâm nghiệp: "About the benefits of poststratification in forest inventories" potx
... well known as a means of increasing the precision of estimates in unstratified sampling by incorporating additional information about strata weights in the final estimator. In gen-eral, stratification ... stratification, the variance of the poststratification estimator is increased by the randomness of the sample size in each stratum.If poststratification is combined with systematic sampling, the gain in ... could be stated by the results presented in Fig. 8. Precision increased only by about 4%, instead of 16% before, for systematic sampling. For random sampling the increase of precision by post-stratification...
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Báo cáo lâm nghiệp: "Assessing the short rotation woody biomass production on marginal post-mining areas" doc
... in an initial stage and the soil structure is still instable. Furthermore, there is no groundwater in uence due to the lower-ing of the groundwater level because of the ongoing mining activities. ... Supported by the Federal Ministry of Food, Agriculture and Consumer Protection and by the Vattenfall Europe Min-ing AG.Assessing the short rotation woody biomass production onmarginal post-mining ... share of marginal post-mining areas. At these sites, crop yield is generally low, and hence, conventional land use systems often fail in terms of reliable and efficient crop production. In this...
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Báo cáo lâm nghiệp: "Extended length rotation to integrate timber and pine nut production with the conservation of structural diversity in a Pinus pinea (L.) forest" pdf
... 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 classification of the forestarea in function of ... samplesua and ua+ d. The experimental variogram and fitted model for the site index and age of the stand areshown in Figure 3. The ordinary kriging prediction p(Z, s0) for the value of the regionalized ... semivari-ogram and the fitted spherical modelusing the weigted least squares(WLS) for the site index (SI) (a) and the stand age (b).Figure 4. Ordinary kriging prediction of the age of the stand obtained...
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