Wyniki wyszukiwania - Biblioteka Nauki

1

Protection of floristic diversity in the Sajna River valley – in view of the planned construction of hydroelectric power station in Sarkajmy

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Laska G.

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nr 20

2

Środowiskowe uwarunkowania i kierunki zrównoważonej gospodarki opartej na wiedzy w aspekcie rozwoju infrastruktury komunikacyjnej Białegostoku

100%

Laska G.

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nr 3[58]

3

Changes in the life strategy and adaptation of the reproductive strategy of Carex digitata to disturbances factors

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Laska G.

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2012

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tom 16

EN

The aim of the paper was to define a relationship between the structure and dynamics of the Carex digitata population. Additionally, modifications in the development of an individual and its life strategy in disturbed communities were analysed. The species was studied in the natural and anthropogenically disturbed oak-hornbeam communities over 23-years of research (1987-2009) conducted on permanent plots in the Knyszyńska Forest. The results of the research indicate that in the natural community, C. digitata individuals reach the phase of flowering and fruition in the 4th year of the life cycle, while in the disturbed community dominated by pine trees - in the 2nd year of the life cycle. Modification of the C. digitata life cycle can be attributed to different reactions of individuals to disturbances in the community, microclimatic, phenological and biocenotic balance to which C. digitata is exposed as a results of the degeneration (pinetization) of the community. The sedge responds differently to specific ecological conditions in the natural and anthropogenically disturbed oak-hornbeam communities due to different life strategies, which affect morphological and developmental features of individual plants, and thus induces changes in the structure and dynamics of populations. This is reflected in a different spatial organization, age structure, size diversity of the individual plants, as well as in various mechanisms regulating the number of individual plants in a population.

4

Klasyfikacja form degeneracji zbiorowisk gradowych w Puszczy Knyszynskiej

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Laska G.

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tom 08

5-87

5

Ecological consequences of deforestation and afforestation on a post-arable land: Changes in the composition and structure of plant communities and transformations of oak-hornbeam habitats and soil

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Laska G.

Ecological Questions

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2014

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tom 20

EN

The species composition and structure of secondary communities developed after deforestation in fertile oak-hornbeam habitats and afforestation of post-arable land from Tilio-Carpinetum and Melitti-Carpinetum circles in the Knyszyńska Forest have been studied. The analysis was based on 178 relevés made by Braun-Blanquet method, including 47 relevés of oak-hornbeam natural communities, 59 relevés of post-clear-cutting communities after deforestation and 72 releves of five secondary forest communities, 30-59 years old forming the first generation of trees on post-arable land. The types of habitats, types of soil and surface geological formations were identified, while soil samples were subjected to chemical analysis. The degree of deterioration of secondary communities on post-arable land was found to be the greater the shorter the time from abandonment of agricultural use of a given area. As a result of former cultivation the soil has been degraded and the composition and structure of plant communities have been altered. The identified vegetation patches show changes characteristic of IV and V phase of degeneration and deformations manifested as cespitization, apophytization and bryophytization. The oak-hornbeam habitats represent the weakly (d) or strongly (D) degraded habitats, with the soil upper layer transformed by tilling into a ploughing horizon (Ap), with changes in the form of humus and considerable simplification in morphology of soil profiles.

6

Parametry populacji i mozliwosci ich wykorzystania w bioindykacji zmian srodowiska

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Laska G.

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tom 09

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nr 1-2

81-95

7

Reakcja populacji Carex digitata na wprowadzenie sosny do zbiorowisk gradowych Puszczy Knyszynskiej

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Laska G.

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tom 5

123-155

8

Zbiorowiska roslinne siedlisk mokradlowych w dolinie Ploski - ocena aktualnego stanu w zaleznosci od roznych form uzytkowania

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Laska G.

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nr 4[28]

141-162

9

Zroznicowanie populacji Carex digitata w naturalnych i zdegenerowanych zbiorowiskach gradowych Puszczy Knyszynskiej

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Laska G.

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tom 5

157-212

10

Species adaptations and their importance in transformations of secondary plant communities

100%

Laska G.

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nr 2

495-529

11

Badania terenowe w ocenie walorów przyrodniczych szaty roślinnej wybranych dolin rzecznych na Wysoczyźnie Białostockiej

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Laska G.

Problemy Ekologii Krajobrazu

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2015

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tom 39

12

Ekologiczno-siedliskowe uwarunkowania przemian gradowych zbiorowisk zastepczych. II. Rola odnowien i nasadzen w inicjacji procesow regeneracji i sukcesji wtornej w gradowych zbiorowiskach zastepczych

100%

Laska G.

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tom 10

22-59

13

Tendencje dynamiczne roslinnosci Puszczy Knyszynskiej

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Laska G.

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tom 7

1-198

14

Rola Carex digitata w przemianach roslinnosci Puszczy Knyszynskiej

100%

Laska G.

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tom 5

213-238

15

Constructions of logical expressions in analysis of vegetation transformations

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Laska G.

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tom 10

EN

The paper reports on the effects and range of anthropogenic pressure exerted on forest communities of the Knyszyńska Forest. A comparison between the potential natural vegetation and real vegetation gives an idea on the degree of damage to forest communities, which has been classified in ecological modelling. Logical expressions have been applied in ecological modelling for spatial analyses of vegetation changes carried out by the program ArcView GIS. The logical expressions applied to the GIS spatial database have permitted finding correlations of occurrence of particular types of the present-day real vegetation (in particular the post-clear-cutting communities, young tree communities and secondary forest communities) relative to the present-day potential natural vegetation. The data obtained in this way have been used in analysis of the scale and range of changes in the forest communities of the Knyszyńska Forest caused by forest management measures.Results of the study have shown that in the Knyszyńska Forest, the secondary communities occupy as much as 88.3% (919.56 km2), while the oldest tree-stands representing natural communities (of 100 - 120 years of age) occupy only 11.7% (122.28 km2). Among the secondary communities the greatest area is occupied by the secondary forest communities representing the stickstand and oldgrowth phases (66.9%) aged from 30 to about 100 years. The contribution of young tree stands - aged from 10 to 30 years is smaller - 16.6%, and that of post-clear-cutting and forest crops forming directly after clear cutting and aged up to 10 years is still smaller - of 4.8%. In the young-tree stands (16.6%) and forest secondary communities (66.9%) the largest is the contribution of those with domination of pine trees (Pinus sylvestris) from artificial reforestation, making 11.2 and 55%, respectively, while the contribution of other secondary communities is much lower.

16

Changes in the photosynthetic apparatus of plants on chosen roads in Bialystok

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Laska G.

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tom 18

EN

Variation in the photosynthetic apparatus of plants, in relation to the species composition and structure of plant communities, has been studied in transects along selected roads in Białystok, characterised with various intensity of traffic. Concentrations of total chlorophyll, chlorophyll a and b and carotenoids were measured in green biomass from 3 non-forest transects and 1 forest transect localised along the main roads. The concentrations of chlorophyll in green biomass from the city transects were compared with those from two reference transects in the centre of Knyszyńska Forest, beyond direct impact of road traffic. The effect of the distance of transects from the roads (4-5 m, 14-15 m and 24-25 m) and the main groups of species making plant communities (in green biomass of trees, bushes, herbal plants and moss) was also analysed.The concentration of total chlorophyll in green biomass from non-forest transects varies from 29.8 mg/g fresh mass to 66.1 mg/g fresh mass, while it is 38.3 mg/g fresh mass from the reference transect, outside the city and beyond direct influence of road traffic. The analogous values of total chlorophyll concentration in green biomass from the forest transects are higher than in the green biomass from non-forest transects, both in the city (70.9 mg/g fresh mass) and from the reference transect (90.4 mg/g fresh mass). According to the results, the content of total chlorophyll in plants is correlated with the intensity of traffic and the distance from the road. Changes in the photosynthetic apparatus depend also on the vertical structure and species composition of the vegetation patches studied. Higher concentrations of chlorophyll in the plants growing in the forest transect than in those in non-forest ones in the city points to the greater role of forested areas as a biological barrier. Their biological effectiveness considerably depends on the floristic composition, so the selection of species in designing of green areas should be made taking into account the effect of seasonal changes and density of individuals per a unit area.

17

Model of anthropogenic disturbance impact on the relationships between vegetation and population dynamics of Carex digitata

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Laska G.

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nr 1

EN

The aim of the paper is to define a relationship between the diversity in structural features of the Carex digitata population and the dynamics of natural and disturbed anthropogenically oak-hornbeam communities in the cycle of 29-year research (1987-2015) conducted on permanent plots in the Knyszyńska Forest. The results of the research indicate that the population dynamics corresponds significantly to the community dynamics, whereas the existing interrelations are a response of Carex digitata population to dynamic vegetation changes undergoing in natural habitats (fluctuation) and under the influence of anthropogenic disturbances (degeneration as a result of pinetization followed by regeneration). This is reflected in a different spatial organization, age structure, size diversity of individual plants, as well as in various mechanisms regulating the number of individual plants in a population. Models of population dynamics in the light of dynamics of the natural and disturbed forest communities can be explained from the viewpoint of equilibrium and non-equilibrium in the nature. It has been proved that in stable communities, where variations in vegetation have a character of little fluctuations and indicate a state of a relevant equilibrium in the nature, the population of Carex digitata also reaches a phase of relevant equilibrium. In such a phase the size of the sedge population is small and changes in the number of individuals in the 29-year cycle slightly fluctuate. A different variation in the population features has been reported in the anthropogenically disturbed community. Processes of degeneration and regeneration are accompanied by rapid dynamic vegetation changes (a state of non-equilibrium) and rapid changes in structural features of the Carex digitata population. The sedge reaction to the dynamic variations in the communities can be explained by a different life strategy which differentiates morphological and developmental features of individuals and thus determines variation of properties of the population.

18

Rozpoznanie stopnia degeneracji zbiorowisk leśnych i możliwości ich regeneracji w świetle badań eksperymentalnych

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Laska G.

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tom 02

19

Ekologiczno-siedliskowe uwarunkowania przemian gradowych zbiorowisk zastepczych. I. Trofizm gornych warstw gleby i jego znaczenie dla kierunku przemian gradowych zbiorowisk zastepczych

100%

Laska G.

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tom 10

7-21

20

Synanthropization of dendroflora near main roads in Białystok (NE Poland)

100%

Laska G.

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2015

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tom 38