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1
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Nowe stanowisko mchu Buxbaumia viridis w Puszczy Białowieskiej

100%
Gawrys R., Szulc A.
Leśne Prace Badawcze
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2017
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tom 78
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nr 3
This paper describes a new occurrence and location of the green shield moss Buxbaumia viridis (Moug. ex Lam. & DC.) Brid. ex Moug. & Nestl. in the Białowieża Forest. One sporophyte was found on a decaying spruce log. However, its existence and the present environmental conditions of the site are threatened by the death of spruce trees. The dying of the spruce trees is expected for the near future and will lead to altered shade conditions impacting on the shield moss.
2
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Rola martwego drewna w regeneracji drzewostanu łęgu jesionowo-olszowego (Fraxino-Alnetum) zasiedlonego przez bobry

100%
Gawrys R., Gabrysiak K.
Sylwan
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2020
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tom 164
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nr 06
The paper concerns the structure of natural regeneration in ash−alder riparian forests (Fraxino−Alnetum) colonized by beavers (Castor fiber) taking into account the substrate, on which it appears (soil and deadwood). Study was conducted in 2016 on twelve sampling plots located in the Orłówka valley in the Białowieża National Park (eastern Poland), where beavers settled around 2005. We counted natural regeneration occurring on the ground and on deadwood on each plot. Also we identified volume of deadwood, decay status and water cover. A decade after the occurrence of beaver ponds, the density of natural regeneration is 5575 saplings per hectare and the regeneration on deadwood is 28% of the total. Black alder is the dominant species. The regeneration occurring on the soil is richer in species and has a larger share of shrub species. In the case of regeneration on the deadwood, seedlings appear first on trees fallen before the flood. Over the time, the role of deadwood as a substrate for the development of regeneration increases and the role of fallen trees is the greater, the greater is the fraction (coverage) of the flooded areas. Studies show that the continuous occurrence of the deadwood accelerates habitat regeneration after a disturbance such as the occurrence of a beaver pond.
3
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Zmiany struktury fitocenoz stawów bobrowych

81%
Gawrys R., Gabrysiak K. A., Czerepko J., Wrobel M.
Sylwan
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2021
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tom 165
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nr 05
4
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Glebowo-wodne uwarunkowania prowadzenia gospodarki leśnej w perspektywie zmian klimatu

81%
Boczon A., Kowalska A., Gawrys R.
Sylwan
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2017
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tom 161
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nr 09
The paper reviews the projected impacts of climate change on forest stands in relation to the local conditions in Poland. One of the most urgent challenges for foresters in Central Europe is adapting the stands to the effects of climate change. Warming of the climate will lead to limited soil water availability to forest stands and to the increasing risk of long−term drought. The threat of soil drought depends on the meteorological conditions, but also on the ability of the soil to retain water. In Poland, forests grow mainly on poor sandy soils with low water retention capacity. Additionally, relatively small precipitation – less than 600 mm per year – occurs in most areas of Poland and long−term periods without precipitation are more and more frequent. In 2015, drought affected large area of the country. The forests are severely exposed to the stress of drought caused by climate change. Polish forests ared comprised of rather small number of tree species. It is considered that drought will threaten the biodiversity of forests. Of all tree species in Poland, Scots pine has the best ability to survive drought and therefore it can be expected that the share of pine in the stands will increase in the future. Pedunculate oak, which is the most common deciduous species in Poland, may retreat because of its vulnerability to drought. Forest management should aim at the adaptation of stands to climate change. The proportion of species resistant to drought stress should be increased. The thinning of forest stand can help to reduce damage. A smaller number of trees contributes to lower interception and consequently increases the amount of water reaching the soil. In some opinions the reduction in the number of trees and the density of the canopy reduces evapotranspiration, but not in Scots pine stands.
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Warunki środowiska wpływające na stan zachowania obuwika pospolitego Cypripedium calceolus L. w lasach gospodarczych

81%
Czerepko J., Gawrys R., Ciesla A., Sokolowski K.
Sylwan
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2014
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tom 158
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nr 11
The paper concerns forest populations of lady's slipper orchid (Cypripedium calceolus L.). The study sites were located in localities with the most numerous populations of Cypripedium calceolus L. in managed forests in Poland. The field studies were conducted in 2012 according to Natura 2000 sites protocols. The aim of studies was the determination of population structure of lady's slipper orchid, especially in indexes reflected number of flowering and fruit plants. The relations between above factors and environmental conditions expressed by ecological indicator values, cover of vegetation layers, species richness, stand age, and intensity of thinning were studies. The obtained results confirmed negative influence of understorey layer and positive influence of density of tree layer on the development of studied orchid populations. The increase in thinning intensity has not significant influence on protection status of Cypripedium calceolus.
6
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Wpływ zagospodarowania lasu na stan zachowania sasanki otwartej Pulsatilla patens (L.) Mill.

81%
Czerepko J., Gawrys R., Ciesla A.
Sylwan
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2014
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tom 158
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nr 01
This paper presents a study on a population of Pulsatilla patens conducted in 2012 in the Myszyniec Forest District in Natura 2000 area ‘Myszynieckie Bory Sasankowe’ in the Kurpie forest (NE Poland). The purpose of the study was to determine the population structure of Pulsatilla patens, especially with regard to abundance, density, and percentage of generative plants in the total population. Correlations were examined between these population features and selected environmental characteristics including ecological indicator values, community layer coverage, number of species group. For the evaluation of the linear relationship between the variables, Spearman's correlation coefficient was used. The research confirmed a significant effect of light availability, clear cuttings areas on all mean values of such indicators of plants as number of flowers, number of plants, share of vegetative and generative plants.
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Regeneration of woody plants in beaver inhabited river valleys

81%
Gawrys R., Wrobel M., Hrynyk O., Gabrysiak K. A.
Sylwan
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2024
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tom 168
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nr 06
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