Báo cáo lâm nghiệp: " Comparison of deposition fluxes on the open area and in mountain spruce stands of different density" pdf
Báo cáo lâm nghiệp: " Comparison of deposition fluxes on the open area and in mountain spruce stands of different density" pdf
... within forest stands. e comparison of bulk deposition fluxes of Ca, Mg, K, S-SO4, N-NO3 and N-NH4 in mountain spruce stands of different stand density and bulk deposition fluxes on the open ... N-NO3 and N-NH4 in the mountain spruce stands of different stand density and bulk deposition fluxes on the open area were measured at the study site Bílý Table 4. Mean annual deposition fluxes of ... S-SO4 in the spruce stands and bulk deposition fluxes on the open area. Throughfall deposition fluxes of Ca, Mg, K and Table 7. Statistical analysis (t-test) between the deposition fluxes of selected...
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Báo cáo lâm nghiệp: "doubling atmospheric CO concentration on 2 matter distribution and CO exchange of 2 yr growth, dry 2 old sweet chestnut trees (Castanea sativa Mill.)" pptx
... decrease in leaf area and areduction in shoot growth, which is veryunusual and may have resulted from the timing of the nutrient application. The accumulation of the carbon ... After the end of July, 62% of the enriched plants ceased growth ascompared with 37% of the controls. The early onset of yellowing and the stopped terminal bud growth indicatesearlier ... (Gaudillere and Mousseau,1989). During the two 1 st 2 wk, the C02concentration in the chamber was main-tained at 330 ppm. It was then increasedto 660 ppm for another 2...
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Báo cáo lâm nghiệp: "Comparison of the impact of blue spruce and reed Calamagrostis villosa on forest soil chemical properties" pot
... pollution induced decay of forest stands in the mountain regions of the Czech Re-public in 1970s to 1990s, there was a problem of autochthonous tree species planting failure on the climatically ... to mitigate the acidification of soil solution and the leaching of basic cations of Ca and Mg from soil.is study aims to compare impact of 20 year last-ing cover of blue spruce, and clear-cut ... lower content of oxidable carbon under PP (only 14.9% in humification horizon). His study was conducted in a lower altitude and all ten tested species had very low content of carbon in H horizon,...
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Báo cáo lâm nghiệp: "Comparison of general tree characteristics of less known oak species Quercus dalechampii Ten. and Quercus polycarpa Schur" pot
... growth and reproduction, the second one by those which attack the wood of standing living trees. Some fungi of the latter group can invade and kill living sapwood causing death to living trees ... carried out on lying trees.e forest stands were coppice converted into high stands on gentle slopes of south western aspect. e parent rock of the sites consisted of limestone; the soil was ... 2006).Although they both occur over a large area of Eu-rope, there is still only limited information on them in most parts of this area. e centre of distribution of both species is situated in south-eastern...
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Báo cáo lâm nghiệp: " Comparison of three methods to determine optimal road spacing for forwarder-type logging operations" pdf
... Journal of Forestry, 72: 207–210.LIU S., CORCORAN T.J., 1993. Road and landing spacing under the consideration of surface dimension of road and landings. International Journal of Forest Engineering, ... road spacing based on minimizing the total cost of skidding and roading from the viewpoint of a landowner. Major variables are removals per ha, skidding cost, road costs and landing costs. ... to the areas with similar terrain and forest removals.CONCLUSIONSOptimal road spacing is an important factor in logging planning to help minimizing the total cost of harvesting and roading....
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Báo cáo lâm nghiệp: "Comparison of mycobiota of diverse aged spruce stands on former agricultural soil" pot
... conditions in years of the study.ree year period of the study is minimal for as-sessment of fungi occurrence as fructifications are strongly dependent on weather conditions. Deter-mination ... fungi in the Norway spruce plantations in formerly agricultural land. In: BALUŠKA F. et al. (eds), Proceedings of the Fourth International Symposium on Structure and Function of Roots. Boston: ... of mycorrhizal activity is less sensitive to actual weather conditions because their develop-ment and function has long-standing effect that is not considerably in uenced by inter and within...
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Báo cáo lâm nghiệp: "Comparison of morphological and physiological parameters of the planting material of Norway spruce (Picea abies [L.] Karst.) from intensive nursery technologies with current bareroot plants" ppt
... regen-eration. Intensive technologies for the production of containerized seedlings and plants are increasingly used in the present nursery practices.If all principles of these intensive greenhouse ... conventional method (2 + 1) were compared with plugs (1cg + 1c: one year in plastic greenhouse and one year in container in the open air) – container plants of the same height produced by an intensive ... 511–517 515reactions is connected with the state of the photo-synthetic apparatus and with photosynthetic rate. e comparison of average values of 5 plants showed higher ETR in container plants...
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Báo cáo lâm nghiệp: "Comparison of two types of ECOLURE lure on Ips typographus (L.) (Coleoptera: Scolytidae)" doc
... lower the amount of beetles. It closely corresponds with the lower level of pheromone released to the environment (immediately after the beginning of the season). On the other hand, the lower ... de-creases, the C/T index increases after opening the bag (Fig. 1) at the end of the season.DISCUSSION Two generations per year were recorded during the survey season. is is common in Central ... decreasing in uence on the number of dead beetles in pheromone traps. is phenomenon is caused by the emission of 1-hexanol and verbenone from dead beetle bodies (Z et al. 2003).CONCLUSIONIn...
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Báo cáo lâm nghiệp: "Comparison of ecosystem C pools in three forests in Spain and Latin America" doc
... roots in four plots from the first 20 cm soil depth; the extremevalues were eliminated and expressed as average of the raining and less raining periods of 2 years [21]. The soil sampling was done ... scale, there are few studies thathave measure C contents in the main pools of ecosystems, be-ing a general rule relating forest from Spain and Latin Amer-ica. The lack of this information in some ... information in some regions constrains the understanding of global C dynamics. To help address this lack of information, the present study compares C contents in the main ecosystem pools of three very...
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Báo cáo lâm nghiệp: "Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species" pptx
... between the twobearing points, a the distance between the two loading points, b is the width and h the height of the specimen.2.9. R, T, L ShrinkageLongitudinal, radial and tangential shrinkage ... were calculated as the ratio of the dimensional variation in each direction between sat-urated and anhydrous states on the dimension in the saturated state.Initial dimensions of the specimens are ... corresponding to the standard methods.2. MATERIAL AND METHODS2.1. Selection of treesAll the trees were selected along the St Elie trail in the rainforest of French Guiana (Tab. I). The criteria...
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