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Mineral soil nitrogen concentration in grass stands after deforestation
1998
Zahora, J. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
Ammonium and nitrate concentrations in soil were determined in the initial stage of grass stand formation and in old closed grass stands (Avenella flexuosa, Calamagrostis villosa). Higher concentrations of both ammonium and nitrate ions were found in the 0-10 cm soil layer in comparison with the deeper soil layer of 10-20 cm. The amounts of NO3-N and water-soluble NH4+N generally represented only a small part of total mineral nitrogen in samples just removed. Presented data indicate seasonal fluctuations in ammonium and nitrate concentrations in soil.
显示更多 [+] 显示较少 [-]Research of basic issues of supraregional biocentre in Knehyne - Certuv Mlyn, the Moravian-Silesian Beskids Mts. [Czech Republic]
1998
Tesar, V. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Fakulta Lesnicka a Drevarska)
The planned supraregional biocentre (SRBC) is a support to the system of landscape ecological stability. The sense of this long-term complex project consists in learning features of the ecotope and dynamics of the forest in its present natural and cultural forms and in all existing stages. A draft management plan will be worked out on this basis for the planned SRBC forest area of 1000 hectares, focused on the dynamic ecological stability.
显示更多 [+] 显示较少 [-]Analysis of control factors of the development of forest ecosystems at the higher altitudes of the Moravian-Silesian Beskids Mts. [Czech Republic]
1998
Kulhavy, J. | Klimo, E. | Hadas, P. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
Evaluation of the water chemism during the flood wave of July 1997 in the Cervik and Mala Raztoka catchment areas in the Beskids Mts. [Czech Republic]
1998
Lochman, V. (Vyzkumny Ustav Lesniho Hospodarstvi a Myslivosti, Jiloviste-Strnady (Czech Republic)) | Chlebek, A. | Jarabac, M.
Biometrical relationships of volume increment to crown defoliation and other variables of spruce stands in the Oravska Polhora research site [Slovak Republic]
1998
Smelko, S. (Technicka Univ., Zvolen (Slovak Republic). Lesnicka Fakulta)
This contribution deals with the relationship evaluated on the basis of 32 permanent monitoring plots. Tree volume increment as a total "brutto" and also as a pure "netto" change for 1 ha is defined. The first one includes also the influence of felling, mortality and increment ingrowth, second one includes only changes due to the growth process. Relationship of increment to stand variables is investigated bz stepwise regression. A more higher correlation to defoliation was found, less high to age, site index and altitude.
显示更多 [+] 显示较少 [-]Investigation of the spruce stand radiation regime
1998
Tomaskova, K. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Lesnicka a Drevarska Fakulta)
Radiation regime is the important part of the energy flow through the stand structure. The goal of the radiation regime studies in the forest stand is to create and develop the technology for radiation measurements and to estimate the impacts of stand density on the radiation regime. The experiment is carried out the Experimental research site Bily Kriz in the Moravian - Silesian Beskydy Mts. with a Norway spruce monocultural stand. Intensities of photosynthetic active radiation, global radiation and intensities of incident and transmitted photosynthetic active radiations through the stand were measured.
显示更多 [+] 显示较少 [-]Determination of rainfall-runoff flood hydrograph for small mountainous watersheds
1998
Byczkowski, A | Ignar, S. (Warsaw Agricultural Univ., Warszawa (Poland)) | Chlebek, A. | Jarabac, M.
The subject of the present study is application of the Wackermann conceptual rainfall-runoff model for rainfall flood hydrograph evaluation of small mountainous watersheds. A quasi-physical system concept for transformation of hydrological variables are used in this model. Effective rainfall was determined with the use of Soil Conservation Service method according to analysis of total rainfall and direct flow volumes. The Rosenbrock optimization method was adopted for determinig of model parameters using rainfall and runoff data recorded on the Mala Raztoka mountainous creek in the Moravian Beskid Range.
显示更多 [+] 显示较少 [-]Norway spruce fine roots investigation in the West Beskids Mts.
1998
Kodrik, M. (Slovenska Akademia Vied, Zvolen (Slovak Republic). Ustav Ekologie Lesa)
Long-term influence of enhanced UV-B irradiation on photosynthetic characteristic of Norway spruce (Picea abies) in the conditions of the Beskids Mts. [Czech Republic]
1998
Sprtova, M. | Marek, M.V. (Akademie Ved, Brno (Czech Republic). Ustav Ekologie Krajiny)
The cloned saplings of Norway spruce (7 years old) were exposed to ambient UV-B irradiation or enhanced BV-B irradiation (+25 %) continuously over three growing seasons. Comprehensive analysis of CO2 assimilation and chlorophyll a fluorescence was performed at the end of the third growing season to evaluate the influence of enhanced UV-B irradiation. The analysis resulted in observations of decreased photosynthetic activity, mainly of RUBISCO activity, as a result of long-term influence of enhanced UV-B irradiation. Morever, the deep impact of enhanced UV-B irradiance on the level of electron transport and thus enhanced sensitivity to photo-inhibition was demonstrated.
显示更多 [+] 显示较少 [-]A study of growth and morphology of Athyrium distentifolium growing in different environmental conditions in the Beskydy Mts. [Czech Republic]
1998
Pande, K. (Ithaca College, New York (USA). Dept. of Biology)