Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 38

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Visual water clarity and light penetration in some recreationally used lakes (western Poland)

100%
Joniak T.
Polish Journal of Natural Sciences
|
2012
|
tom 27
|
nr 4
A characteristic of apparent and true depth of illuminated zone in 12 recreationally used lakes of western Poland during the summer was conducted. Depth of photic zone derived from using underwater spherical quantum sensor of photosynthetically active radiation (PAR). The effects of dissolved and suspended optically active substances (chlorophyll a, turbidity, total suspended sediment, dissolved substances) on light conditions in the trophic types of lakes were analyzed. Lakes were divided into three trophic states: mesotrophic, eutrophic, and hypereutrophic. Additionally, the content of some optical features of water in zone of swimming versus to lake were analyzed. Turbidity of water was mainly related to the TSS, especially in swimming zone. The large differentiation the depth of illuminated zone within the meso- and eutrophic lakes was noted. The mesotrophic lakes were characterized by greater depth of PAR than lakes of higher trophy. In hypereutrophic lakes with high content of chlorophyll and turbidity in the sub-surface layer the disappearance of light was rapidly below the surface.
2

Dynamika opadów atmosferycznych a zasobność związków biogenicznych i materii organicznej w jeziorach śródleśnych

100%
Joniak T.
Ekologia i Technika
|
2009
|
tom 17
|
nr 4
3

The structure of phosphorus compounds in mid-forest humic lakes

100%
Joniak T.
Oceanological and Hydrobiological Studies
|
2010
|
tom 39
|
nr 2
4

Factors affecting range of photosynthetically active light in three lakes of Wielkopolski National Park

100%
Joniak T.
Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego
|
2009
|
tom 06
5

Wplyw zaporowego Zbiornika Maltanskiego w Poznaniu na liczebnosc i dynamike dominujacych gatunkow fitoplanktonu w dolnym biegu Cybiny

100%
Joniak T.
Badania Fizjograficzne nad Polską Zachodnią. Seria B
|
2000
|
tom 49
195-205
6

Charakterystyki optyczne wody jako narzędzia oceny potencjału rekreacyjnego i jakości wód jezior

100%
Joniak T.
Ekologia i Technika
|
2015
|
tom 23
|
nr 1
7

Seasonal variations of dominant phytoplankton in humic forest lakes

100%
Joniak T.
Oceanological and Hydrobiological Studies
|
2007
|
tom 36
|
nr 2
8

Impact of black cormorant (Phalacrocorax carbo Sinensis L.) on the transport of dissolved organic carbon from the catchment area to the lakes

63%
Klimaszyk P., Joniak T.
Polish Journal of Soil Science
|
2011
|
tom 44
|
nr 2
The objective of the study was to estimate transport of dissolved organic carbon from the area of cormorant colonies located in northern Poland. The investigations were carried out on two morphologically differentiated colonies located on lake islands. In the case of the colony characterised by significant slope inclination – the main path of transfer of water and DOC was surface runoff. During the breeding season, surface runoff waters from the cormorant colony contained an average of 380 mg DOC dm⁻³. In the case of the colony with small land elevation, surface transfer of DOC occurred mainly via shallow groundwater. Average concentration of DOC in groundwater of that colony was 64 mg DOC dm⁻³.
9

Vertical and spatial differentiation of phosphorus content in bottom sediments of deep eutrophic lake in relation to organic matter concentration

63%
Sobczynski T., Joniak T.
Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego
|
2008
|
tom 05 A
10

Ocena potencjału naturalnej odnowy roślinności zanurzonej w zdegradowanym Jeziorze Góreckim (Wielkopolski Park Narodowy)

63%
Robak M., Joniak T.
Ekologia i Technika
|
2015
|
tom 23
|
nr 4
11

Czy dzikie gęsi zagrażają jakości wód Jeziora Góreckiego w Wielkopolskim Parku Narodowym?

63%
Sobczynski T., Joniak T.
Ekologia i Technika
|
2009
|
tom 17
|
nr 1
12

Effect of aquatic macrophytes on water trophy of lowland water bodies in aspect of their surface differentiation

63%
Joniak T., Kuczynska-Kippen N.
Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego
|
2008
|
tom 05 A
13

Aspekty środowiskowe rekultywacji jezior metodą inaktywacji fosforu - Jezioro Witobelskie (Wielkopolski Park Narodowy)

63%
Sobczynski T., Joniak T.
Ekologia i Technika
|
2010
|
tom 18
|
nr 5
14

Vertical changeability of physical-chemical features of bottom sediments in three lakes, in aspect type of water mixis and intensity of human impact

63%
Sobczynski T., Joniak T.
Polish Journal of Environmental Studies
|
2009
|
tom 18
|
nr 6
Variation of the chemical composition of bottom sediments collected from three lakes with different water mixis, morphometric parameters, catchment areas and anthropogenic pressures was analyzed. Sediment samples were characterized by water content and concentrations of organic matter, nitrogen, phosphorus, calcium, iron and aluminium. Statistically significant correlations between the content of organic matter, nitrogen and phosphorus were found. In a large and deep lake (dimictic) subjected to limited human impact, the tendency changes of chemical composition along the sediment profile indicates a recent considerable increase in water trophy. In a small mid-forest lake (classified as meromictic), the changes in chemical composition of bottom sediments along with depth point to periodical increases in fertility as a result of wastewater inflow. In a large mid-field lake (polymictic), the analogous variation has indicated disturbances in the mechanism of sediment formation.
15

The variability and stability of water chemistry in a deep temperate lake: results of long-term study of eutrophication

63%
Sobczynski T., Joniak T.
Polish Journal of Environmental Studies
|
2013
|
tom 22
|
nr 1
Temporal and seasonal variability of hydrochemical properties in a deep, highly eutrophic lake was presented. It was shown that the feedback between the biocenosis and abiotic properties was of key importance for the lake environment, especially for features shaped by oxygen content. During vegetation season in a shallow trophogenic zone supersaturated with oxygen, quick depletion of some nutrients (mineral forms of nitrogen, phosphorus, and carbon) were noted. In a tropholytic zone, which constituted the major part of the lake water column, the mineralization of organic matter concentrations of mineral compounds were high. This layer was completely and permanently deoxygenated (anoxia). The reductive conditions intensified the release of biogenic compounds from bottom sediments. Many correlations between abiotic properties of water reflecting the complex interrelationships between biocenosis and biotope were stated. The relationship between photosynthesis and alkalinity and calcium distribution in the water column also was explained. On the basis of historical data (since the 1930s), tendencies of temporal changes in lake water chemistry were discussed as well as causes and effects of eutrophication.
16

Stan ekologiczny rzeki Samicy Stęszewskiej w gminie Stęszew i w Wielkopolskim Parku Narodowym - stan obecny i zagrożenia

63%
Joniak T., Sobczynski T.
Ekologia i Technika
|
2011
|
tom 19
|
nr 4
17

The chemistry of water and bottom sediments in relation to zooplankton biocenosis in small agricultural ponds

63%
Joniak T., Kuczynska-Kippen N.
Oceanological and Hydrobiological Studies
|
2010
|
tom 39
|
nr 2
18

Contribution to the limnology of three dystrophic lakes of the Drawienski National Park, Northern Poland

63%
Joniak T., Kraska M.
Acta Hydrobiologica
|
1999
|
tom 41
|
nr Suppl.6
19
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Influence of humification on biodiversity of lake benthic macroinvertebrates

63%
Joniak T., Domek P.
Acta Agrophysica
|
2006
|
tom 07
|
nr 2[133]
20
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Biodiversity of phytoplankton in hydrochemically different types of humic lakes in the Drawienski National Park

63%
Joniak T., Kraska M.
Acta Agrophysica
|
2006
|
tom 07
|
nr 2[133]
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.