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-SO 4 , N-NO 3 and N-NH 4 in mountain spruce stands of different stand density and bulk deposition fluxes on the open ... N-NO 3 and N-NH 4 in the mountain spruce stands of different stand density and bulk deposition fluxes on the open area were measured at...

Ngày tải lên: 07/08/2014, 04:20

... decrease in leaf area and a reduction in shoot growth, which is very unusual 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 as compared with 37% of the controls. The early onset of yellowing and the stopp...

Ngày tải lên: 09/08/2014, 04:20

... 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-...

Ngày tải lên: 07/08/2014, 03:22

... 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...

Ngày tải lên: 07/08/2014, 03:22

... 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,...

Ngày tải lên: 07/08/2014, 04:20

... 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...

Ngày tải lên: 07/08/2014, 04:20

... 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...

Ngày tải lên: 07/08/2014, 10:22

... 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 surve...

Ngày tải lên: 07/08/2014, 10:22

... roots in four plots from the first 20 cm soil depth; the extreme values 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 that have measure C contents in the main pools of ecosystems, be- ing a general rule relating forest from Spain and Latin Amer- ica. The l...

Ngày tải lên: 07/08/2014, 16:20

... between the two bearing 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 Shrinkage Longitudinal, 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....

Ngày tải lên: 07/08/2014, 16:21