Báo cáo lâm nghiệp: "Rodent-caused damage to forest trees from the viewpoint of forestry practice" potx

... QH72075. Rodent-caused damage to forest trees from the viewpoint of forestry practice J. K 1,2 , K. T 2 , M. H 1 , E. B 2 1 Institute of Vertebrate Biology, Academy of Sciences of the Czech ... management. is corresponds to the comparison of damage caused by rodents and damage due to other harmful factors. Most of the foresters...

Ngày tải lên: 07/08/2014, 03:22

... predators produces changes in food chains. In forest stands influenced by human activities the reasonable game management and the regulation of game stock seems to be one of the main tools in forest ... consequently increase damage to nearby forest stands. – Insufficient and low-class hoofed game feeding in hard times. It is usually convenient to feed wildlife game acc...

Ngày tải lên: 07/08/2014, 04:20

... is again a theme of another research inclusive of determination of the elastic constant according to separate layers. Appropriate tests to determine parameters men- tioned above will be the ... density of plywoods significantly a ects the capacity of the material to dampen noise. To achieve good sound-proof properties materials of a density of 630 kg/m 3...

Ngày tải lên: 07/08/2014, 04:20

... 89–95 89 JOURNAL OF FOREST SCIENCE, 57, 2011 (3): 89–95 Environmental risk assessment based on semi-quantitative analysis of forest management data L. K 1 , R. M 2 1 Forest Research ... damage. DISCUSSION  e developed regression models can be considered as standalone complex models of environmental risk prediction allowing the “chance and potency” ana...

Ngày tải lên: 07/08/2014, 10:21

... of plywood is available. Plywoods differ in many factors. CONCLUSION e aim of the paper was to propose the method- ology of testing the abrasion resistance of combined water-proof plywood materials ... aim of the paper was to propose the methodology of testing the abrasion resistance of combined water-proof plywood materials with the phenol...

Ngày tải lên: 07/08/2014, 10:21

... di- amine putrescine (Put), triamine spermidine (Spd) and tetramine spermine (Spm). ere are a number of reports indicating that PAs play a crucial role in somatic embryo development including ... hurst ecotype of Norway spruce. Contents of free polyamines (putrescine, spermi- dine, and spermine) were determined in different developmental stages of Norway spruce somatic...

Ngày tải lên: 07/08/2014, 10:21

... difference in the index was confirmed in the spruce virgin forest in the altitudi- nal range of 1,300–1,400 m. e analysis of the structure of the spruce virgin forest in Nefcerka NNR assessed according ... Education of the Slovak Republic, Project No. 0082-06. A change in structural diversity and regeneration processes of the spr...

Ngày tải lên: 07/08/2014, 10:22

... of the trees at the treeline was similar to the subalpine level, and the correlations between the two chronologies consequently increased significantly. 3.4. Growth trends in dominant trees The ... argues in favor of the fact that the tree establishment, and more in general the forest dynamic, has been mainly controlled by human land-use (Fig. 6) and tha...

Ngày tải lên: 07/08/2014, 16:20

... P1 and P2 together, confirmed that damage was an explanatory factor which was much sig- nificant than the other variables and factors available. Thus overall, the damage factor had both a statistical ... A risk of fork emergence was calculated for each of the damage levels. The relative risk of fork emergence, with its confidence limit (at 5% of risk level),...

Ngày tải lên: 07/08/2014, 16:20

... 10.1051/forest:2003058 Original article Growth, damage and net nitrogen uptake in Picea abies (L.) Karst. seedlings, effects of site preparation and fertilisation Fredrik NORDBORG*, Urban NILSSON Swedish University of ... following hypotheses: (i) site preparation increases seedling initial growth and reduces damage during the first year after plant...

Ngày tải lên: 08/08/2014, 01:21

... Growth response of Q. pyrenaica to thinning 245 The results of Ducan’s test also explain the aforementioned different responses to thinning intensities in the two growth intervals (Tab. ... deviation (in bracket) absolute and relative stem diameter increment of Q. pyrenaica trees in unthinned and thinned treatments (C – light thinning; D – moderate thinning; E – heavy th...

Ngày tải lên: 08/08/2014, 01:22

... but Short note Insect damage to cones and other mortality factors limiting natural regeneration potential of Swiss stone pine (Pinus cembra L) in the northern French Alps L ... seed cones of P cembra, and then to measure the respective impact of insects and other mortality factors on the potential of natural...

Ngày tải lên: 08/08/2014, 18:21

... follow- ing the level line (Sauras et al, 1992). A sys- tematic sampling in the same plots (Arias et al, 1991 ), showed higher variability Note Sampling strategies in forest ... and Krause, 1984). SAMPLING STRATEGIES The objectives of the study are to determine the sampling strategy since the technique used strongly influences the informa...

Ngày tải lên: 08/08/2014, 18:21

... with air pollutants. According to Levitt (1980), two strategies can be distinguished: avoid- ance and tolerance. While avoidance stra- tegies include the cuticle and the stomata, tolerance ... lead to re- latively severe damage to trees, especially under unfavorable weather conditions and shortening of the vegetation period. The stomata can play...

Ngày tải lên: 09/08/2014, 04:20

... Physiological responses to low temperature O. Junttila Department of Plant Physiology and Microbiology, ... the plant. Native species and provenances are normally adapted to local climate but responses to low temperature are of great importance when species or ecotypes are moved ... derived from Norstar winter wheat. Theor. Appl. Genet. 75, 480-484...

Ngày tải lên: 09/08/2014, 04:20