D. Zahradník

Silva Tarouca Research Institute for Landscape and Ornamental Gardening

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i-10 index

Research Trends

Author Order

Document Type

Co-Authors

I. Kuneš

Czech University of Life Sciences Prague

KČ

Karel Černý

Silva Tarouca Research Institute for Landscape and Ornamental Gardening

Ludmila Havrdová

Silva Tarouca Research Institute for Landscape and Ornamental Gardening

Martin Baláš

Czech University of Life Sciences Prague

V. Balcar

Forestry and Game Management Research Institute

Lukáš Bílek

Czech University of Life Sciences Prague

T. Koňasová

Czech University of Life Sciences Prague

LŠ

Lubomír Šálek

Czech University of Life Sciences Prague

Jiří Remeš

Czech University of Life Sciences Prague

D. Kacálek

Forestry and Game Management Research Institute

Cooperative Institutions

Czech University of Life Sciences Prague

Silva Tarouca Research Institute for Landscape and Ornamental Gardening

Charles University

Forestry and Game Management Research Institute

Mendel University in Brno

University of Hradec Králové

Czech Academy of Sciences

National Forest Centre

Czech Academy of Sciences, Institute of Botany

Czech Hydrometeorological Institute

Author Statistics

Papers

Citation

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Research Field

Models for predicting aboveground biomass of European beech (Fagus sylvatica L.) in the Czech Republic

Journal of Forest Science (2015)

Monika Vejpustková D. Zahradník Tomáš Čihák Vít Šrámek

We developed optimal models for predicting the aboveground biomass of European beech (Fagus sylvatica L.) applicable to the national forest inventory data of the Czech Republic. The models were based on a data set of 81 beech trees collected in 19 stands that represent a wide range of stand and site conditions. The relationship between biomass and tree dimensions (diameter D, height H) was modelled using non-linear regression equations with one (D) or two (D, H) independent variables and two or three parameters (D2, DH2, DH3 models). Subsequently additional predictor variables, i.e. tree age, site index and altitude, were added to the basic models. The inclusion of tree age (T) and altitude (A) in the basic DH2 model resulted in the best model for aboveground biomass (DH2AT model). The altitude (A) and site index (S) were important predictors for stem biomass estimate (DH3AS model). Similarly, branch biomass was predicted in the best way by four-variable model DH2AS.

Site index

Tree (set theory)

10.17221/100/2014-jfs

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Citations (18)

Natural regeneration of senescent even-aged beech (Fagus sylvatica L.) stands under the conditions of Central Bohemia

Journal of Forest Science (2009)

Lukáš Bílek Jiří Remeš D. Zahradník

The natural regeneration of beech (Fagus sylvatica L.) was studied under various shelterwood densities and silvicultural treatments in senescent beech stands in Central Bohemia. Four permanent research plots differed in shelterwood density, crown cover and average relative light intensities. Between 2003 and 2007, seed production, seedling emergence and survival were followed. The mean density of beech seeds (full and empty) per 1 m2 was estimated in another forest stand. In the autumn of 2003 the values were distinctly higher than those indicated for full mast years of beech. Despite high losses during the wintering of seeds, relatively low germination and high first-season mortality, the high density of 1-year-old beech seedlings indicates that these elements are not the factors which hinder natural regeneration. The thickness of the humus horizons influenced the density of young beech seedlings during all the three years. Ground vegetation was more frequent outside the crown projections of parent trees and increased with distance from the nearest tree. A reduction of crown cover to the level of 80% was an appropriate measure that assured the high survival of beech regeneration during the observed four-year period. Border cutting with the outer face oriented towards the east has to be considered as less suitable for beech regeneration than shelterwood systems and group selection harvesting.

Natural regeneration

Mast (botany)

Growing season

Thinning

10.17221/823-jfs

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Citations (23)

Effects of fertilisation on growth and nutrition of Norway spruce on a harsh mountain site

Journal of Forest Science (2013)

I. Kuneš Martin Baláš V. Balcar D. Kacálek Kateřina Millerová

We evaluated the potential of crushed amphibolite and artificial slow-release N-P-K-Mg fertiliser to stimulate the survival, growth and nutrition of Norway spruce planted on an acidified air-polluted mountain site. Control plots and treatments with slow-release fertiliser (SRF) and amphibolite (AMT) were installed. In the SRF, forty grams of tabletted amendment were applied in the close vicinity of the trees. In the AMT, two kilograms of amendment were incorporated into the soil inside the planting hole of each tree at planting. The SRF application resulted in a significant growth stimulation of spruces. The growth stimulation by amphibolite was perceptible but not significant; this amendment, however, significantly reduced mortality. None of the amendments induced marked changes in foliar nutrient concentrations.

Amendment

10.17221/6988-jfs

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Citations (10)

Thus spoke peptides: SARS-CoV-2 spike gene evolved in humans and then shortly in rats while the rest of its genome in horseshoe bats and then in treeshrews

Communicative & Integrative Biology (2022)

Jaroslav Flegr D. Zahradník Michaela Zemková

SARS-CoV-2 is suspected to be the product of a natural or artificial recombination of two viruses - one adapted to the horseshoe bat and the other, donor of the spike protein gene, adapted to an unknown species. Here we used a new method to search for the original host of the ancestor of the SARS-CoV-2 virus and for the donor of its gene for the spike protein, the molecule responsible for binding to and entering human cells. We computed immunological T-distances (the number of different peptides that are present in the viral proteins but absent in proteins of the host) between 11 species of coronaviruses and 38 representatives of the main mammal clades. Analyses of pentapeptides, the presumed principal targets of T-cell non-self recognition, showed the smallest T-distance of the spike protein of SARS-CoV-2 to humans, while the rest of SARS-CoV-2 proteome to the horseshoe bat. This suggests that the ancestor of SARS-CoV-2 was adapted to bats, but the spike gene donor was adapted to humans. Further analyses suggest that the ancestral coronavirus adapted to bats was shortly passaged in treeshrews, while the donor of the spike gene was shortly passaged in rats before the recombination event.

Rest (music)

Horseshoe (symbol)

10.1080/19420889.2022.2057010

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Citations (3)

On optimizing of forest stands age structure.

D. Zahradník Róbert Marušák I. V. Abrudan G. Spãrchez O. Ionescu

Age structure

Forest structure

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Citations (0)

Cultivation of speckled alder under harsh mountain conditions

Journal of Forest Science (2012)

I. Kuneš Martin Baláš T. Koňasová D. Zahradník V. Balcar

The aims of the paper were as follows: (1) to assess the applicability of speckled alder for pioneer stands on the mountainous clear-cut tracts and (2) to evaluate the effects of slow-release fertilizer on the survival and growth of speckled alder under harsh environmental conditions. On the basis of seven-year results we can presume that speckled alder is a convenient pioneer species that can be cultivated on harsh mountain sites where the climatic extremes need to be alleviated and a layer of surface humus renewed. The initial slow-release fertilization is, nonetheless, highly desirable. As contrasted to the control the surface and planting hole applications of amendment reduced the total seven-year mortality rate by 9.5% and 20.1%, respectively, and the periodic annual height increment (2003-2009) was promoted by 47% and 59%, respectively. Analogous results were obtained when the values of basal stem diameter and crown diameter were compared. As for the method of application, the placement of the slow-release amendment in the planting holes seems to be more efficient mainly in terms of survival promoting. The surface application is, nonetheless, less laborious and also yielded satisfactory results.

Amendment

Humus

10.17221/92/2011-jfs

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Citations (11)

Influence of micro-relief and weed competition on natural regeneration of mountain forests in the Šumava Mountains

Journal of Forest Science (2010)

Václav Štícha I. Kupka D. Zahradník Stanislav Vacek

Natural regeneration and its relationship to micro-relief and weed competition were studied on 6 research plots in mountain spruce forests in the Šumava Mountains. The data on density regeneration, total height and height increment of each seedling were recorded on 50 by 5 m transects. The position of each seedling was adjusted by a satellite system "Field map". The data show that an elevation is a significantly (significance level P = 0.99) preferable micro-relief for seedlings in most cases (7 of the total 9 cases). The regeneration density is low in a high-competition environment, i.e. in grass and ferns, where the number of seedlings is significantly low on all surveyed plots. But dead wood, which is also an elevation in terms of the micro-relief, is the most preferable micro-site. The data show no significant differences in seedling heights due to differently dominant competing plants. Neither was the hypothesis about the beneficial influence of stem or stump in close surroundings on seedlings confirmed by our data.

Elevation (ballistics)

Natural regeneration

Forest regeneration

10.17221/28/2009-jfs

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Citations (12)

Forest Attendance in the Times of COVID-19—A Case Study on the Example of the Czech Republic

International Journal of Environmental Research and Public Health (2022)

Vilém Jarský Petra Palátová Marcel Riedl D. Zahradník Radek Rinn

The COVID-19 pandemic affected people all over the world, including the Czech Republic (CZ). In the CZ, a number of measures were applied in 2020 to reduce the contact between people and their mobility. This article dealt with the importance of forests during the pandemic. Data from 2019 and 2020 were compared. The qualitative data were obtained from two nationwide surveys, the first focused on forest attendance and forest fruit collection (about 1000 respondents per year), the second on the motivation to visit the forests (about 3700 respondents per year). The quantitative data were obtained on the regional level by analysing data from mobility counters. The impact of government restrictions was assessed. Findings: (1) there was a significant increase in the number of people who frequently visited the forest in 2020; (2) in 2020, the amount of households that collected forest fruits increased and was the highest for the monitored period; (3) the increased forest attendance significantly corresponded to the government restrictions. The analysis confirmed the great importance of forests for the citizens and, at the same time, the increased pressure on the forests’ use—forest attendance and forest crops picking—(especially suburban ones) in times of COVID-19 restrictions.

Attendance

Pandemic

10.3390/ijerph19052529

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Citations (22)

Crowns of old remnant oak standards.

Fresenius environmental bulletin (2017)

Lubomír Šálek Ahmet Sıvacıoğlu Osman Topaçoğlu D. Zahradník Lucie Jeřábková

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Citations (19)

Possible methods of Norway spruce (Picea abies[L.] Karst.) stem shape description

Journal of Forest Science (2005)

M. Křepela D. Zahradník J. Sequens

The paper shows a possibility of using Bookstein coordinates for stem shape studies. Bookstein coordinates are simplified to stem shape diameters, for which tests of multidimensional normality, variance-covariance matrix homogeneity, equality of mean shape vectors and principal component calculation are carried out in sample plots Doubravčice 1 and Štíhlice. Principal components are also calculated for Procrustes tangent coordinates, presented in graphs, and the plots are compared. Doubravčice 1 and Štíhlice plots differ especially in age (70 and 30 years) while they do not differ in tree class representation.

10.17221/4560-jfs

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Citations (2)