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1

Wolves (Canis lupus) in the Torun Basin (N Poland): actual status and problems concerning the population

100%
Sewerniak P.
Ecological Questions
|
2015
|
tom 21
The characteristics on the present wolf population of the Toruń Basin were presented in the paper. The subject was introduced in terms of main ecological issues on Canis lupus as well as current problems in man-wolf relations occurring in the region. Forests of the Toruń basin are populated by 25–30 resident wolves which actually live in five packs. For some last seasons the predators have reproduced what is probably the main reason for stated slight increase in wolf number in the region. The major actual threats to local wolf population were indicated: pouching, car traffic and illegal off-road motor activity. In July 2014, the first for the 21st century documented wolf attacks on domestic ungulates were stated in the Toruń Basin when two unprotected from predators cow calves were bite near the Rafa village (NE of Bydgoszcz).
2

Wolves in the Torun Basin

100%
Sewerniak P.
Ecological Questions
|
2010
|
tom 13
The present wolf population of the Toruń Basin is one of the very few that exist in the central and the western part of Poland. Wolves populated the region at the turn of the 20th and 21st centuries, and at least since 2004 they reproduced in the forests on both sides of the Vistula River. The population from the Toruń Basin is probably an important source of wolves that colonize Western Poland and spread to Western Europe. However, the human pressure on the environment is continuously increasing in the Toruń Basin, therefore the future stability of the existence of wolves in the region is uncertain. The aim of the paper is to present the main data on the occurrence of wolves in the Toruń Basin, together with the main human threats to the wolf population in this region.
3
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Wpływ rzeźby terenu na bonitację i cechy wzrostowe drzewostanów sosnowych na wydmach Kotliny Toruńskiej

100%
Sewerniak P.
Sylwan
|
2016
|
tom 160
|
nr 08
The aim of the study was to determine the impact of land relief on site index and growth parameters (height, diameter, slenderness) of Scots pine (Pinus sylvestris) stands on inland dunes in the Toruń Basin (N Poland). The study was conducted on 150 plots situated on north− and south−facing dune slopes (54 pairs of twin plots) as well as in intra−dune depressions (42 plots). Height and diameter of ten the thickest pines per 0.1 hectare was measured, and next site index as a potential height of a stand at the age of 100 years was calculated. As the results of the used equation, site index was strongly (R²=0.58) negatively biased to age, so the bias was removed using an elaborated regression model. For stands older than ca. 20 years, the clear higher site index values as well as higher heights and diameters were found for intra−dune depressions than for slopes of the two studied aspects. This was explained by the occurrence of much more fertile and moister soils in depressions. The only age class for which the advantage of site index and growth parameters was not stated for depressions was the youngest class (≤20 years old). This was likely caused by the competitive impact on young pines of Calamagrostis epigejos which prefers intra−dune depressions on inland dunes and forms in forest floor usually dense cover in this position. Impact of contrasting slope aspect was clearly related in the study to age of a stand. For the youngest studied age class both site index values as well as heights and diameters were lower on north− than on south−facing slopes. This was explained by the effect of weeds which form more dense cover on slopes of this aspect than on sunny slopes. For older stands; however higher site index values as well as heights and diameters were revealed for north−facing slopes, due to pines likely took advantage of higher moisture of soils occurring in this place. With reference to slenderness, regardless stand age the parameter was regularly the highest for north− than both for south−facing slopes and depressions. Because of the revealed distinct higher productivity of intra−dune depressions in normally dry and poor in nutrients dune landscape, it could be reasonable to use the depressions to introduce admixtures of broadleaved tree species into pine monocultures on inland dunes.
4
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Wpływ uziarnienia gleby na bonitację drzewostanów sosnowych w południowo-zachodniej Polsce

100%
Sewerniak P.
Leśne Prace Badawcze
|
2011
|
tom 72
|
nr 4
5

Wstepne wyniki badan nad wplywem uziarnienia gleby na bonitacje drzewostanow sosnowych w poludniowo-zachodniej Polsce

100%
Sewerniak P.
Roczniki Gleboznawcze
|
2008
|
tom 59
|
nr 3-4
256-262
6

Survey of some attributes of post-agricultural lands in Polish State Forests

100%
Sewerniak P.
Ecological Questions
|
2015
|
tom 22
Based on materials gained in March 2015 from the Forest Data Bank the survey of some attributes (forest address including Regional Directorate of State Forest (RDSF), area in hectares, soil unit, forest site type, dominant species in a forest stand and age of the dominant species in a stand) of post-agricultural lands occurring in Polish State Forests was conducted in the paper. Distribution of post-agricultural lands in Poland by RDSF as well as the structure of soil units, forest site types, dominant tree species and the age of the species was presented and analyzed in the article. Distribution of post-agricultural lands is not regular in regions of Poland as the highest share of such lands in the total area of State Forests was stated for a northern part of the country (RDSF in Szczecinek, Piła and Olsztyn) and the lowest for central-southern regions (RDSF in Katowice, Radom and Kraków). In spite Brunic Arenosols distinctly prevail in cover of post-agricultural lands occurring in State Forests (65.8%) the soil unit is not the dominant one in all regions of Poland. Namely, in RDSF located in mountainous and upland areas Cambisols and Luvisols predominate. In terms of forest site types structure, mesotrophic sites clearly prevail in post-agricultural lands as two forest site types (fresh mixed coniferous forest and fresh mixed broadleaved forest) cover 62.4% of all such lands. In spite Scots pine (Pinus sylvestris L.) is the main tree species overgrowing post-agricultural soils in Polish State Forests the share of the species in young plantations established in last two decades has clearly decreased. It has resulted from appearing since 1990s an increasing importance of ecologisation of forestry in Poland what has been reflected e.g. in a distinctly increase of a share of broadleaved species in young plantations introduced on post-agricultural lands in last decades. The trend has especially pertained oak species (Quercus petraea and Q. robur) and beech (Fagus sylvatica) of which much higher share was stated for the youngest analyzed age class (<20 years) of post-agricultural woodlands than for older forest stands.
7

Pozyskiwanie biomasy a gleba leśna

100%
Sewerniak P.
Las Polski
|
2011
|
nr 04
8
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Wpływ właściwości gleb piaszczystych na bonitację drzewostanów sosnowych w południowo-zachodniej Polsce. II. Wybrane właściwości chemiczne

100%
Sewerniak P.
Sylwan
|
2012
|
tom 156
|
nr 07
9
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Wpływ właściwości gleb piaszczystych na bonitację drzewostanów sosnowych w południowo-zachodniej Polsce. I. Odczyn, zawartość CaCO3 i cechy związane z głębokością gleby

100%
Sewerniak P.
Sylwan
|
2012
|
tom 156
|
nr 06
10
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Bonitacja drzewostanów sosnowych w południowo-zachodniej Polsce w odniesieniu do typów siedliskowych lasu i taksonów gleb

100%
Sewerniak P.
Sylwan
|
2013
|
tom 157
|
nr 07
Forming of site index class of Scots pine (Pinus sylvestris L.) stands in relation to forest site types (including their moisture variants) and soil units (type/subtype and also – in minor extent – geological genesis of soil parent material) was investigated. The research was conducted in the Bolesławiec, Głogów and Oława forest districts (SW Poland) in 348 Scots pine stands. The values of the pine site index got higher with increasing fertility of soil units and better forest site type, but only when plots of sandy soils where concerned. Site index was found to differ significantly between fresh than moisture forest sites and soil units. The study results demonstrated that on fresh soils of sandy texture site index of Scots pine was distinctly related even to minor differences of site properties that concerned both its moisture and fertility. Scots pine, by height growth, does not fully utilize the great nutrient retention of fine textured soils that concerned both fresh and moisture pedons. Fine textured soils should be designed for eutrophic broadleaved tree species planting only, which would enable to fully utilize the trophic potential of such soils. The relation between the site index and geological genesis of sand forming parent material of soils was found. The differences in pine growth on sands of other genesis were assumed to be a result of different sorting and mineral composition of these materials.
11

Zróżnicowanie wybranych właściwości gleb drzewostanów sosnowych w południowo-zachodniej Polsce

100%
Sewerniak P.
Roczniki Gleboznawcze
|
2011
|
tom 62
|
nr 1
12

Deforestation increases differences in morphology and properties of dune soils located on contrasting slope aspects in the Torun military area (N Poland)

63%
Sewerniak P., Jankowski M.
Ecological Questions
|
2015
|
tom 21
In a comparative research we investigated characteristics of soils situated on contrasting slope aspects (northern and southern) in two inland dune ecosystem types: 1. dunes overplanted with a pine production forest and 2. dunes deforested for military purposes, where for some decades natural succession has been the main driver for vegetation development. We found that afforested dune slopes were entirely occupied by Podzols slightly varying by degree of development in respect to slope aspect what clearly changed after deforestation. Removal of forest distinctly predisposed dry south-facing dune slopes for erosion, which affected in truncation of Podzols. Nowadays, deforested southern slopes are covered by regenerating, weakly developed soils – Arenosols; while conditions prevailing on deforested northern slopes preserve Podzols. Such situation implies distinct increase of primarily existing differences in characteristics of soils of opposite slope aspects such as moisture, temperature and organic carbon stocks.
13
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Wpływ sposobu przygotowania gleby na dynamikę jej temperatury na wydmach Kotliny Toruńskiej

63%
Sewerniak P., Stelter P.
Sylwan
|
2016
|
tom 160
|
nr 11
The objective of the study was to determine the dynamics of soil temperature on inland dunes in the Toruń Basin (N Poland) with reference to the two methods of site preparation: homogenization of belts with a forest mill (FR) and preparation of trenches with a double−mouldboard plough LPZ−75 (LPZ). The study was conducted in a young Scots pine (Pinus sylvestris) plantation on plots with soil prepared by a forest mill on north− and south−facing slopes of a dune (FR−N and FR−S respectively) and with soil prepared with a plough on the ridge of a small aeolian mound (LPZ). On each plot a soil pit was dug and soil samples were taken from distinguished horizons for laboratory analyses. Besides, from April to December of 2013, at interval of ca. two weeks, soil temperature was measured at the depths of 3, 10, 25 and 50 cm. To estimate daily amplitudes of temperature in topsoil on the studied plots, in a sunny summer day (23.08.2013) the temperature was additionally measured from 5 a.m. to 9 p.m. with an hourly interval. These measurements were taken at the two upper depths (3 and 10 cm). Despite the fact that soil surface was distinctly darker for belts prepared with a mill than in trenches prepared by a plough, soil temperatures were almost regularly lower in FR−N and in FR−S than in LPZ. This concerns all the investigated depths. The differences were explained by much higher moisture of soil material in belts what involves higher thermal capacity and with that slower heat of a soil, as well as causes higher losses of thermal energy for evaporation. Another agent explaining this was indicated to be related to high porosity of materials found in the belts. Namely, especially in dry periods, high volume of soil pores are filled on the FR plots with air what impedes heat transfer in a soil. It was concluded that stated in a previous study worse growth of pines planted in milled belts than in tranches prepared with a plough was unlikely related to differences in soil thermal conditions. Thus, differences in growth dynamics of young pines in plots with site prepared by the two studied methods are caused by other reasons rather as primarily other competitive impact of weeds and differences in soil water conditions occurring at root system of young trees.
14
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Gleby i siedliska drzewostanów nasiennych dębu szypułkowego (Quercus robur) i dębu bezszypułkowego (Q. petraea) w Polsce

63%
Andrzejczyk T., Sewerniak P.
Sylwan
|
2016
|
tom 160
|
nr 08
The aim of the study was to investigate the structure of forest site types and of soil types of oak seed stands in Poland. The study was comparatively conducted with reference to sessile (Quercus petraea) and common (Q. robur) oaks. As in Poland the seed stands are established only in stands characterized by favourable both growth parameters and timber quality, it was suspected that the results of the study would enable to indicate optimal sites and soil units for oak breeding in Poland. The study was conducted on the basis of data obtained from the SEMEN database (www.bnl.gov.pl) which were broadened by descriptions of the investigated seed stands found in the Forest Data Bank (www.bdl.lasy.gov.pl). For both oak species, the research was conducted with reference to the two types of seed stands: permanent (WDN) and temporary (GDN). In total, 531 stands of Quercus petraea and 2043 of Q. robur located across whole Poland were investigated in the study. It was found that optimal soils as well as forest site types overlap for both investigated oak species only for fresh broadleaved forest (Lśw). For other forest type sites distinct differences for the oak species were found. The optimum for common oak were expanded towards the wet sites (moist broadleaved forest – Lw, and riparian forest – Lł), while for sessile oak towards semi−fertile mixed broadleaved forest (LMśw). It is interesting that seed stands of both oak species overgrow not only fine−textured soils, but significant share of them (ca. 50% area of Q. petraea and 15% of Q. robur seed stands) occurs on sandy soils (Brunic Arenosols mainly). It proves that Brunic Arenosols constitute forest sites enabling production of broadleaved forests characterized by favourable growth parameters and high timber quality. However, it is possible unless the soil have been podzolized by conifers due to podzolized Brunic Arenosols were rarely represented in the oak seed stands and, if so, the stands were characterized by relatively low site index. It was also stated that on podzolized Brunic Arenosols of fresh mixed coniferous forest (BMśw) admixture of oak should enable reducing negatively impact of conifers on a soil.
15
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Sukcesja wtórna drzew w krajobrazie wydmowym stałej powierzchni badawczej Glinki w świetle analizy GIS

63%
Sewerniak P., Mendyk L.
Leśne Prace Badawcze
|
2015
|
tom 76
|
nr 2
16
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Ujęcie wpływu właściwości gleb piaszczystych na bonitację drzewostanów sosnowych w południowo-zachodniej Polsce w modelach regresji

63%
Sewerniak P., Piernik A.
Sylwan
|
2012
|
tom 156
|
nr 08
17
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Wpływ przygotowania gleby frezem leśnym na wzrost sadzonek sosny zwyczajnej w warunkach ubogich siedlisk Puszczy Bydgoskiej

51%
Sewerniak P., Gonet S. S., Quaium M.
Sylwan
|
2012
|
tom 156
|
nr 11
18
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Intensywność mineralizacji igieł w borze sosnowym w odniesieniu do warunków siedliskowych i mikrobiologicznych stoków wydm o kontrastowej ekspozycji

51%
Sewerniak P., Jasinska J., Golinska P., Skladanowski M.
Sylwan
|
2015
|
tom 159
|
nr 10
The aim of the study was to determine the rate of mineralization of needles in a pine stand in relation to site and to microbiological conditions occurring on dune slopes of contrasting aspects. The research was conducted in the old−growth pine forest overgrowing a latitudinally located dune in the Bydgoska Forest (N Poland). On contrasting dune slopes (northern and southern) rate of mineralization of pine needles was investigated in the 2−years experiment (2012−2014) with the litterbag method. Besides, following investigations were conducted in the middle part of both slopes: 1. dynamics of soil moisture and soil temperature were measured at a depth of 3 cm for 18 days during the 2013 growing season (interval of 2 weeks was applied) and 2. populations of bacteria and fungi were determined for all subhorizons of organic soil horizon (Ol, Of, Oh) as well as for a mineral horizon (AEs) of both soils. Weight loss of needles was found to be higher on northern than on a southern slope what was consequently stated for all 4 terms of taking measurements (6, 12, 18 and 24 months after placement of litterbags). The discrepancy has increased with time and after 2 years it equaled 14.7% when the loss was 61.1% for northern and 46.4% for a southern slope. It could be surprising that such differences were found in spite a sunny slope was characterized by stated in a study higher soil temperature. It should have a stimulating effect on mineralization of organic material; however a soil located on a southern slope was also found as much drier. Thus, the periodic deficiency of soil moisture was indicated as a limiting factor for occurrence of both bacteria and fungi on a southern slope due to the numbers of both groups of microorganisms were much lower on the slope than on a northern aspect. Conditioned by more favourable site parameters, higher number of microbial population occurring on a shadow slope could explain higher rate of mineralization of needles stated for the slope aspect. The moisture factor can be of especially high significance for microbial occurrence and activity and thus for litter decomposition just in dry inland dune ecosystems. It was concluded that in relatively monotonous pine forests overgrowing dry and poor in nutrients soils of inland dunes the slope aspect is an agent significantly differentiating both site and soil microbial conditions.
19

Relations between features of forest floor vegetation and surface soil horizons properties in scots pine (Pinus sylvestris L.) stands in southwest Poland

51%
Sewerniak P., Gonet S. S., Piernik A.
Polish Journal of Soil Science
|
2009
|
tom 42
|
nr 2
The paper presents the studies on relations between features of forest floor vegetation and surface soil horizons (organic and humus) properties. The research was taken in 100 pine stands located in southwest Poland. The investigated relations were different when concerning two forest floor layers. The higher values of the analysed herb layer indicators (the herb layer cover and the amount of plant species in the herb layer) are related to the higher trophy of the surface soil horizons. For the analogous moss layer indicators the relations are opposite to the herb layer relations. In the investigated pine stands the forest floor species composition was more related to organic than to humus horizon properties.
20
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Ekspozycja stoków wydm w Kotlinie Toruńskiej a wybrane elementy ekosystemu boru sosnowego – wstępne wyniki badań

51%
Sewerniak P., Bednarek R., Szymanska A.
Leśne Prace Badawcze
|
2011
|
tom 72
|
nr 1
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