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Resultados 1-10 de 10
Allometric relationships between stem volume and the biomass of Norway spruce
1998
Pokorny, R. (Akademie Ved, Brno (Czech Republic). Ustav Ekologie Krajiny)
The objectives of this study were (I) to establish allometric relationships between the stem volume and biomass of the stem, branches, leaves and the leaf area, and crown dimensions of individual trees, (II) to determine the relative aboveground biomass distribution, (III) to determine the vertical gradient of the specific leaf area and (IV) to estimate the aboveground stand biomass and the leaf area. Diameter at 0.3m height above ground and height of each tree were measured as the basic biometrical characteristics. The coefficient of the shape of the trunk was found by Huber's method.
Mostrar más [+] Menos [-]Comparison of soil thermal regimes in a deforested area with various grass cover in the Beskids Mts. [Czech Republic]
1998
Tuma, I. (Akademie Ved, Brno (Czech Republic). Ustav Ekologie Krajiny)
The studies of grass communities, which spread in deforested areas, also involved observations of soil thermal regimes. Three sites were chosen in order to determine differences in diurnal and seasonal variations of soil temperatures: (1) open site (barren) without plant cover, (2) site covered by a young, lower and thinner stand of Avenella flexuosa, and (3) old, dense stand of Calamagrostis villosa with a layer of plant litter on the soil surface. Soil temperatures were measured at the soil surface and in the soil depth of 5 and 10 cm. In summer months, the greatest differences in maximal temperatures recorded at the soil surface and at the 5, 10 cm depth between the bare site and the old stand of C. villosa represented 21.6, 15.9, 12.4 deg C, respectively. Soil temperatures measured in the bare plot in autumn months were lower than those in grass stands.
Mostrar más [+] Menos [-]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.
Mostrar más [+] Menos [-]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.
Mostrar más [+] Menos [-]Morphometry of Calamagrostis arundinacea populations at sites exposed to different immission loads in the Beskids Mts. [Czech Republic]
1995
Jakrlova, J. (Akademie Ved, Brno (Czech Republic). Ustav Ekologie Krajiny)
Dynamics of shoot growth in two Calamagrostis villosa stands of the Kehyne Mts. [Czech Republic]
1995
Holub, P. (Akademie Ved, Brno (Czech Republic). Ustav Ekologie Krajiny)
Development of young mountain spruce stands undergoing various silvicultural measures in the Beskids [Czech Republic]
1995
Tesar, V. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Pestovani Lesa)
The influence of increased nitrogen availability on the growth and content of elements in the aboveground biomass of Calamagrostis villosa
1999
Holub, P. (Akademie Ved, Brno (Czech Republic). Botanicky Ustav)
Reduction of nutrient losses from forest soil due to growth of grasses on immission barrens
1999
Fiala, K. | Tuma, I. | Holub, P. (Akademie Ved, Ceske Budejovice (Czech Republic). Botanicky Ustav)