Affiner votre recherche
Résultats 21-30 de 89
A study of the effect of the growth activity of grasses on accumulation and losses of organic matter and nutrients on deforested sites [Czech Republic]
1998
Fiala, K. | Tuma, I. | Holub, P. (Akademie Ved, Brno (Czech Republic). Ustav Ekologie Krajiny)
Norway spruce increment as related to the type of branching in the Moravian-Silesian Beskids Mts. [Czech Republic]
1998
Hauck, O. | Palat, M. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
Data necessary for the determination of the proportion of various types of branching in stands under study, their variability within a tree, accuracy of classification of the type of branching, damage to particular types of branching due to breakage and initial age for their reliable recognition were obtained according to method from 1,336 trees situated in 11 trial plots in the region of the Beskids. Statistically significant differences were determined in the diameter and height increments for particular types of branching.
Afficher plus [+] Moins [-]Water balance and erosion intensity in mid-European small forested basins
1998
Jarabac, M. | Chlebek, A. (Vyzkumny Ustav Lesniho Hospodarstvi a Myslivosti, Frydek-Mistek (Czech Republic))
Possibilities of using ground basic rock flours in forestry
1998
Vavricek, D. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
Surface liming even in higher doses did not affected soil Ph and improving the content of Mg and Ca was only temporary. Spot fertilization by fine-ground amphibolite is significant particularly from the aspect of long-term affects. Short-term affects manifested themselves slightly but in the whole system of particular parameters. Application of higher amounts (3 kg.ha-1) of amphibolite has its substantiation in the future.
Afficher plus [+] Moins [-]Regeneration processes of a Norway spruce virgin forest of the Stata nature reserve Pilsko in the Oravian Beskids Mts. [Slovak Republic]
1998
Saniga, M. (Technicka Univ., Zvolen (Slovak Republic). Lesnicka Fakulta)
Physiological aspects of the health state of Norway spruce using different silvicultural concepts
1998
Kmet, J. | Jaloviar, P. (Technicka Univ., Zvolen (Slovak Republic). Lesnicka Fakulta)
The sample trees from two stands managed by different management systems - shelterwood and selection systems, and two generations within each stand, were compared. The evaluation of the potential acidity and conductivity of dry-mass extracts (KSE) proved an adverse effect of environment on the maternal stand in the shelterwood forest. The KSE-values are systematically higher in samples taken from the young as well as mature sample trees in the selection forest. Despite the limited duration and extent of the investigations, a better ecological stability of the selection forest as compared with the shelterwood one was observed.
Afficher plus [+] Moins [-]Air pollutants of SO2 and total potential deposition of sulphur of the forest territory Moravian-Silesian Beskids Mts. [Czech Republic] in 1996
1998
Hadas, P. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
According to the geostatistical methods annual sums of precipitation, mean annual concentrations of SO2, total potential deposition of sulphur as inputs to the mountain forest ecosystem of Moravian-Silesian Beskids on the spatial level in 1996 were derived. For this purpose, all possible meteorological and monitoring stations in the surroundings of the cesearch teiritory were used.
Afficher plus [+] Moins [-]Use of epicuticular waxes changes for detection of latent forest decline
1998
Bednarova, E. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Ekologie Lesa)
The aim of this study was to obtain data for elaboration of methods that would be suitable for detection of assimilative apparatus damage, if the damage is still in its latent phase. The needles are covered with epicuticular waxes, which have a protective function, but are also damaged by air pollution first.
Afficher plus [+] Moins [-]Synusiae of cambioxylophages of subdominant Norway spruce trees stressed by root-fungal pathogens
1998
Kula, E. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Fakulta Lesnicka a Drevarska) | Zabecki, W.
Some 30 species of cambioxylophages with the dominant position of Pityophthorus pityographus, Polygraphus poligraphus, Pityogenes chalcographus, Molorchus minor and Obrium brunneum were recorded on subdominant trees attacked by Armillaria sp. and Heterobasidion annosum. The stress induced by fungal pathogens on subdominant trees causes unfavourable conditions for the development of Ips typographus and increases attractiveness for P. poligraphus and M. minor. Species of P. chalcographus and P. pityographus response indifferently.
Afficher plus [+] Moins [-]Defect in formation of annual rings and forest damage due to air pollution in the region of Horna Orava [Slovak Republic]
1995
Dursky, J. (Technicka Univ., Zvolen (Slovakia). Lesnicka Fakulta)