Wyniki wyszukiwania - Biblioteka Nauki

1

Properties of surface of bottom sediments in the coastal zone of the Gulf of Gdańsk (1994-1995)

100%

Dubrawski R. , Witkowska K. , Kula A.

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tom Vol. 27, No. 4

23-47

EN

Results of chemical and granulometric investigations of bottom surface sediments of the near-shore zone - beach and shallow water zone - carried out along cross-shore profiles in the Gulf of Gdansk in the period 1994-1996 are presented. Organic matter, total phosphorus and nitrogen, and carbonate (beach and dune) contents, also pH and the reducing-oxidising potential (Eh), as well as granulo-metric composition of the sediments were determined. The seasonal and spatial changes in sediment composition, relationships between the components, the rate of self-purification and the influence of factors shaping the properties of sediments were defined. It has been found that the sediment environment of the Gulf of Gdansk is in poor condition and that its further degradation is likely to happen.

2

Selected properties of the coastal waters of the Gulf of Gdańsk (autumn 1994 and summer 1995)

100%

Witkowska K. , Dubrawski R.

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tom Vol. 27, No. 4

11-21

EN

Results of investigations on the physical and chemical properties (transparency, temperature, salinity, total nitrogen and phosphorus contents) of the Gulf of Gdansk near-shore waters carried out in autumn 1994 (September - October) and summer 1995 (June - July) are presented. Spatial and seasonal variability of water properties and environmental conditions were determined. The results obtained point to the steady degradation of near-shore environment, the range of which is slowly extending further into the water body.

3

Zmienność stężenia fosforu w górnej części zlewni rzeki Zagożdżonki

100%

Hejduk L. , Banasik K.

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2008

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tom Vol. 17, No. 4

57--64

PL

W pracy przedstawiono wynik analiz fosforanów rozpuszczonych i fosforu ogólnego prowadzonych w trzech okresach w latach 1991-2008 w górnej części zlewni Zagożdżonki w dwóch przekrojach pomiarowych: Czarna i Płachty Stare. Maksymalne zaobserwowane wielkości stężeń wynosiły 1,95 mg PO4/l dla fosforanów rozpuszczonych i 5,78 mg P/l dla fosforu ogólnego. Zaobserwowano tendencje spadkową stężeń analizowanych wielkości pomiędzy okresami badawczymi. Na podstawie średnich miesięcznych z analizowanego okresu, określono miesiące w roku, w których stężenia były maksymalne i minimalne.

EN

In this paper, the results of dissolved phosphorus and total phosphorus concentration during three research period of year 1991-2008 in upper part of Zagoż- dżonka River has been presented. The results concern two gauging: Czarna and Płachty Stare. The maximum observed concentration of dissolved phosphorus reached 1.95 mg PO4/l and total phosphorus 5.78 mg P/l. The decrease of concentration has been between researches periods has been noticed. Based on month average concentrations, the maximum and minimum concentrations periods have been described.

4

Application of neural networks for the prediction of total phosphorus concentrations in surface waters

100%

Mozejko J. , Gniot R.

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2008

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tom 17

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nr 3

363-368

EN

This paper describes the application of artificial neural networks (ANNs) for the time series modeling of total phosphorous concentrations in the Odra River. Data from the monitoring site Police in the lower part of the Odra were used for training, validating and testing the models. Two models are proposed to prove the satisfactory forecast of phosphorus concentrations: a simpler one with a single input variable and a more complex one with 14 input variables. Both ANN models show a high ability to predict from the new data set. On the basis of sensitivity analysis the relationships between phosphorus concentrations and other water quality variables were established.

5

Temporal variability in the chemical composition of bottom sediments in the Pomeranian Bay (southern Baltic)

100%

Burska D. , Frankowski L. , Bolałek J.

Oceanologia

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1999

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tom No. 41 (3)

445-459

EN

Seasonal changes in the chemical composition of sediments from four stations located in the Pomeranian Bay were analysed. The investigations were carried out in four periods (March and July 1996, and May and October 1997). The following parameters were investigated: organic carbon and nitrogen, total phosphorus and organic phosphorus, loss on ignition and redox potential. On the basis of these results the influence of the following processes and phenomena was noted: the early spring phytoplankton bloom dominated by diatoms (March 1996); the intense inflow of allochthonous matter brought into the Bay with the waters of the Swina (May 1997); the summer bloom of blue-green algae and dinoflagellates (July 1996); the consequences of the summer 1997 flood which occurred in southern Poland (October 1997).

6

Fosfor i jego forma nieorganiczna ekstrahowana wodą w roślinnych surowcach leczniczych

84%

Konieczyński P. , Wesołowski M.

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nr 5-6

61-66

EN

INTRODUCTION It is known from studies of impact of phosphorus’ chemical form on bioavailability of other essential elements that phosphorus occurring as phytate decreases bioavailability of several metallic elements, such as calcium and iron. Taking this into consideration, the investigations on bioavailable form of phosphorus have signifi cance in aspect of supplementation of a human organism in essential elements. Therefore the aim of the work was to determine in what degree the inorganic form of phosphorus absorbed with often applied herbal preparations (infuses and decoctions), can be a source of this element for humans. RESULTS Based on literature review and the results of own studies, the contents of phosphorus in medicinal plant raw materials was characterized, as well as the utility of infuses obtained from them as the sources of bioavailable phosphorus for a human organism was evaluated. The results of cited investigations indicate the diff erentiation of level of the studied macro-element in plant material, and of P-PO4 in infuses. Sources of this diff erentiation are origin of plant material from diff erent anatomical organs of medicinal plants, from diff erent botanical plant species, as well as from diff erent conditions of growth or harvest. The level of total phosphorus was determined on average in mg/g d.m. of plant material, and its water-extractable form was from 28.3 to 62.3% of total phosphorus. CONCLUSIONS It was found that in the majority of cases there was statistically signifi cant correlation between total phosphorus and P-PO4 passing to an aqueous extract (infusion). The concentration of total phosphorus is also correlated with total nitrogen in medicinal plants, which can be justifi ed by participation of both elements in synthesis of biologically active compounds. It was also indicated that infuses obtained from medicinal plant raw materials deliver about 1% of recommended daily intake of phosphorus for a human organism.

PL

WSTĘP Z badań nad wpływem formy chemicznej fosforu w żywności na przyswajalność innych biopierwiastków wiadomo, że fosfor w postaci fi tynianów ogranicza biodostępność niektórych pierwiastków metalicznych, np. wapnia i żelaza. Badania nad biodostępną postacią fosforu mają znaczenie w aspekcie zaopatrzenia organizmu człowieka w pierwiastki niezbędne. Celem prowadzonych badań jest określenie, w jakim stopniu fosfor w postaci nieorganicznej, przyjmowany wraz z często stosowanymi przetworami roślinnymi (naparami i odwarami), może być źródłem tego pierwiastka dla człowieka. WYNIKI Na podstawie przeglądu piśmiennictwa oraz badań własnych scharakteryzowano zawartość fosforu w roślinnych surowcach leczniczych oraz oceniono przydatność uzyskanych z nich naparów jako źródła biodostępnego fosforu dla organizmu człowieka. Wyniki cytowanych prac wskazują na zróżnicowanie poziomu badanego makroelementu w materiale roślinnym oraz formy P-PO4 w wyciągach wodnych. Źródła tego zróżnicowania to pochodzenie surowca z różnych części wegetatywnych roślin leczniczych, z roślin należących do różnych gatunków botanicznych, a także różne warunki uprawy lub zbioru. Poziom fosforu całkowitego określono przeciętnie jako kilka mg/g s.m. surowca roślinnego, natomiast jego forma ekstrahowana wodą stanowi 28,3–62,3% całkowitej ilości tego pierwiastka. WNIOSKI Stwierdzono, że w większości przypadków istnieje statystycznie istotna zależność między fosforem całkowitym a P-PO4 przechodzącym do wyciągu wodnego (naparu). Zawartość fosforu całkowitego jest także skorelowana z całkowitą ilością azotu w roślinach leczniczych, co wynika z udziału obu pierwiastków w syntezie związków biologicznie czynnych. Wskazano również, że napary uzyskane z roślinnych surowców leczniczych dostarczają około 1% zalecanego dziennego pobrania fosforu dla organizmu człowieka.

7

Wpływ rolnictwa na stężenie fosforu ogólnego w wodach powierzchniowych zlewni rzeki Śliny

84%

Kiryluk A. , Rauba M.

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2011

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tom Nr 26

122-132

PL

Zbadano stężenie fosforu ogólnego w wodzie rzeki Śliny. Rzeka Ślina i jej dopływy znajdują się na typowym obszarze rolniczym. Badania przeprowadzono w latach 2007-2010 w 19 stałych punktach badawczych usytuowanych na całej długości rzeki. Średnie stężenie fosforu ogólnego wynosiło 0,92 mg Pdm-3. Wartość tego wskaźnika, powoduje, że wody rzeki Śliny ze względu na stężenie fosforu należy uznać za pozaklasowe i wrażliwe na eutrofizację. Główną przyczyną dużego stężenia fosforu w wodzie rzeki jest duża koncentracja chowu bydła (obsada 2-3 DJPha-1) a także spływy wód powierzchniowych do rzeki wraz ze związkami biogennymi.

EN

Examined of the concentration of total phosphorus in the waters of the Ślina River. Ślina River and its tributaries are the typical agricultural area. The study was conducted in 2007-2010 in 19 permanent research points located along the river. The average concentration of total phosphorus was 0,92 mg P dm-3. The value of this parameter implies that the waters of Ślina River because of the concentrations of total phosphorus should be considered outside class, and sensitive to eutrophication. The main reason high concentration of phosphorus in the waters of the river is a large concentration of cattle (2-3 DJP ha-1) as well as surface water runoff into the river, together with biogenic compounds.

8

Performance prediction and control for wastewater treatment plants using artificial neural network modeling of mechanical and biological treatment

84%

Alnajjar H. Y. H. , Üçüncü O.

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tom Vol. 49, no 2

16--29

EN

Biological treatment in wastewater treatment plants appears to be one of the most crucial factors in water quality management and planning. Though, measuring this important factor is challenging, and obtaining reliable results requires signifi cant eff ort. However, the use of artifi cial neural network (ANN) modeling can help to more reliably and cost-effectively monitor the pollutant characteristics of wastewater treatment plants and regulate the processing of these pollutants. To create an artifi cial neural network model, a study of the Samsun Eastern Advanced Biological WWTP was carried out. It provides a laboratory simulation and prediction option for flexible treatment process simulations. The models were created to forecast influent features that would affect effluent quality metrics. For ANN models, the correlation coefficients R-TRAINING and R-ALL are more than 0.8080. The MSE, RMSE, and MAPE were less than 0.8704. The model’s results showed compliance with the permitted wastewater quality standards set forth in the Turkish water pollution control law for the environment where the treated wastewater is discharged. This is a useful tool for plant management to enhance the quality of the treatment while enhancing the facility’s dependability and efficiency.

9

Odprowadzanie składników biogennych (n, p) w plonie biomasy ślazowca pensylwańskiego (sida hermaphrodita rusby) nawadnianego ściekami wiejskimi

84%

Strzelczyk M.

Inżynieria Ekologiczna

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2013

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tom Nr 32

181--186

PL

W pracy przedstawiono wyniki 2 letnich badań nad oczyszczaniem wiejskich ścieków komunalnych w środowisku glebowo-roślinnym przy wykorzystaniu ślazowca pensylwańskiego (Sida hermaphrodita (L.) Rusby). Ze względu na znaczny przyrost biomasy roślina ta jest uprawiana na cele energetyczne. Szybki wzrost powoduje znaczne zapotrzebowanie na wodę i składniki pokarmowe. Dzięki swoim właściwościom rośliny te mogą być przydatne w procesach biologicznego oczyszczania ścieków. Ilość składników biogennych odprowadzonych w łodygach ślazowca sięgnęła 270 kgN•ha-1 •rok i 74,3 kgP•ha-1 •rok. Ilość azotu i fosforu pobrana i odprowadzona z plonem roślin zależna jest od dawki tych składników dostarczanej ze ściekami i zwiększa się z wiekiem roślin oraz ich plonami.

EN

Presented in the paper are results of 2-year studies on treating rural sewage in soil-plant environment utilizing Sida hermaphrodita (L.) Rusby. Due to significant growth of biomass this plant is used for energy purposes. Rapid growth causes significant demand for water and nutrients. Due to their properties, such plants can be useful in processes of biological sewage treatment. The maximum amount of biogenic components discharged with Sida stalks was 270 kgN•ha-1 •year and 74,3 kgP•ha-1 •year. The amount of nitrogen and phosphorus collected and discharged yield of plants depends on the dose of the components supplied with sewage and is increases with the age of plants and their yield.

10

How did the nutrient concentrations change in northeastern German lowland rivers during the last four millennia? - a paleolimnological study of floodplain sediments

84%

Schonfelder I. , Steinberg C. E. W.

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2004

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tom Vol. 21

129-138

EN

This study focuses on the feasibility of floodplain sediments and fluvial sediments in paleomeanders and ox-bows of two lowland rivers (River Havel, River Spree, Brandenburg State, Germany) as archives for quantitative paleolimnological reconstructions and potential basis of future river management strategies. The results presented provide a mean to differentiate between the natural and cultural eutrophication of rivers. Available transfer functions of littoral diatom assemblages in 84 Brandenburg lakes and river sites, and total phosphorus (TP) and total inorganic nitrogen (TN) were used to infer nutrient changes in the Rivers Havel and Spree since the last 4,000 years. In the River Spree near Platkow, fossil diatoms indicated moderate eutrophic TP- and TN-concentrations between 1300 and 1850 AD (TP: 36 mg dm-3, TN: 1,000 mg dm-3). During this time period, the human impact on the nutrient status of the River Spree was more or less indirect via increases of runoff from the catchment as a result of deforestation. In the second lowland river, the lower River Havel, diatom inferred TP-concentrations were 80 žg dm-3 in the late Subboreal (2,000 to 500 BC). That means that the natural diatom flora of this river was eutrophic; mesotrophic conditions even in times without intensive land use did not occur. Furthermore, the fossil diatom flora revealed a potential nitrogen limitation during summer times (till 1400 AD: TN 1,600 to 1,700 mg dm-3). Anthropogenic eutrophication impact on the River Havel can be detected since approximately 800 year ago. The diatom-inferred nitrogen/phosphorus-relation highlighted different trends in eutrophication history within the study area. Without human activities the ratio of both nutrient components was relatively constant. Anthropogenic changes in the catchment area led to a declining TN/TP ratio in the last 1,000 years with changes in algal communities, such as increases of nuisance cyanobacteria blooms in the last decades.

11

Use of the macromodel DNS/SWAT to calculate the natural background of TN and TP in surface waters for the RAC parameter

84%

Wilk P. , Orlińska-Woźniak P.

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tom Vol. 12, no. 1

171--179

EN

Total nitrogen (TN) and total phosphorus (TP) get into surface waters from both natural and anthropogenic sources. Anthropogenic sources have been relatively well recognised but the natural emmission of nutrients into the rivers, in the case of many catchments, remains a mystery. The paper describes the possibility of using a tool, the Macromodel DNS/SWAT (Discharge Nutrient Sea/Soil and Water Assessment Tool), to estimate the concentration and load of natural background (Natural Pollutant Concentration - NPC and Natural Pollution Load - NPL) for TN and TP and thus to specify the previously developed method of river absorption capacity - RAC. A variant scenario was developed allowing for a “virtual” change in the use of the area of an analysed catchment. This allowed the simulation of the amount of TN and TP in the waters of the main river, the Warta, in a situation where there was no anthropogenic phenomenon in the area. NPC and NPL results were obtained for six calculation profiles located on the central Warta main stream. On this basis, the total absorbency of the Total River Absorption Capacity - RACT River was calculated. The obtained results indicate an increasing pollution of the analyzed river on subsequent Surface Water Bodies (SWB). The values of RAC and RACt parameters for both TN and TP were reduced between the opening and closing profiles of the analyzed catchment by 2651 t/y (TN) and 86 t/y (TP), respectively.

12

Effect of pH, dissolved organic carbon and total phosphorus concentrations on selected life history traits of Luronium natans [L.] Raf.

84%

Bazydlo E. , Szmeja J.

Polish Journal of Ecology

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2004

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tom 52

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nr 2

EN

A hypothesis has been put forward that low pH or high concentration of total phosphorus (TP) and dissolved organic carbon (DOC) in the lake water are the factors responsible for observed extinction of the population of Luronium natans (L.) Raf., protected macrophyte species from the group of isoetids. A study was performed on 525 generative individuals collected from 21 lakes in Pomeranian Lakeland (NW Poland) and a correlation between the biometric characteristics and environmental conditions in the lakes was tested. The following life history traits have been analysed: size of individuals, their fecundity and allocation of biomass. The greatest and most fecund individuals grow in the lake water of pH 6.1–7.0, poor in TP (10.1–20.0 µg dm⁻³) and DOC (3.5–6.0 mg C dm⁻³). The allocation of biomass of the individuals growing in the optimum conditions is as follows 46–54% in the leaves, 22–31% in the roots and 20–27% in the rhizome. In the lakes with water of pH < 5.0 or of TP > 20.1 µg dm⁻³ and DOC > 6 mg C dm³, a statistically significant decrease in the size of the individuals and unfavourable changes in the biomass allocation are found. The main environmental factor responsible for dying out of local populations of Luronium natans is a decrease of pH below < 5.0.

13

Total organic carbon as a new index for monitoring trophic states in lakes

67%

Dunalska J. A.

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nr 2

14

Zmienność stosunku stężeń azotu i fosforu dla wybranych zlewni rzek przymorza

67%

Wilk P. , Orlińska-Woźniak P. , Gębala J.

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tom Vol. 26, No. 1

55--65

PL

Wciąż aktualny problem nadmiernej eutrofizacji wód powierzchniowych, w tym Morza Bałtyckiego, sprawia, że istotne staje się nie tylko określenie samych stężeń związków biogennych w wybranych profilach rzecznych, ale również próba odpowiedzi na pytanie, który z pierwiastków jest czynnikiem limitującym wzrost biomasy. Produkcja biologiczna w wodach powierzchniowych jest zależna od wielu czynników, w tym od wzajemnych stosunków między azotem i fosforem w czasie fotosyntezy. Badania, których wyniki zaprezentowano w artykule, prowadzono w latach 2012–2014 na dwóch zlewniach rzek przymorza, Redze i Słupi, w trzech cyklach w ciągu roku obejmujących okres wegetacji roślin, okres po usunięciu roślin uprawnych z pól oraz okres wczesnowiosenny bezpośrednio po roztopach. Na podstawie otrzymanych wyników przeanalizowano zmienności dobowe i sezonowe stężeń związków biogennych oraz określono, który z pierwiastków limituje przyrost biomasy na wybranych zlewniach, korzystając z zależności, jaka występuje między azotem i fosforem w wodach powierzchniowych, zwanej stosunkiem Redfielda.

EN

Due to the ever present problem of excessive eutrophication of both surface waters and their main receiver, i.e. Baltic Sea, it becomes important to determine not only the concentration of nutrients in selected river profiles, but also an attempt to answer the question of which of the elements is a factor limiting the growth of biomass. Biological production in surface area is dependent on a number of factors including the relations between the nitrogen and phosphorus during photosynthesis. The study, whose results were presented in the article, was conducted in 2012–2014 on two littoral river basins, Rega and Słupia, in three cycles throughout the year including both vegetation period, the period after the removal of crops from the fields and the period of early spring, immediately after the thaw snow. On the basis of the results were analyzed variability of daily and seasonal concentrations of biogenic compounds and on the basis determined which of the elements limits the increase in biomass in selected catchments using the dependence that exists between the nitrogen and phosphorus in surface waters called Redfield ratio.

15

Quality of waters of Szczecin Lagoon and Pomeranian Bay

67%

Wira J. , Wira D.

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tom 07

16

Propozycja wspolczynnikow przeliczeniowych obliczenia fosforu fizjologicznego w miesie drobiowym oddzielonym mechanicznie [MDOM] oraz produktach drobiowych wyprodukowanych z jego udzialem

67%

Michalski M. M.

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nr 3

28-35

PL

W pracy określono zawartość białka oraz fosforu ogólnego w mięsie drobiowym oddzielonym mechanicznie (MDOM) oraz w wybranych produktach drobiowych wyprodukowanych z jego udziałem. Zaproponowano współczynniki przeliczeniowe obliczenia fosforu fizjologicznego w MDOM-ie i produktach mięsnych z jego udziałem. Proponuje się odpowiednio współczynnik 0,13 dla MDOM bez względu na pochodzenie oraz 0,14 dla produktów z max. 60% dodatkiem MDOM.

EN

This work aimed to measure the content of total phosphorus in Mechanically Separated Poultry Meat (MSPM) and in poultry meat products containing MSPM and evaluate a converting factor for calculate total phosphate. Proposed converting factors for the three examined MSPM and for the exemplary assortments of poultry products enable us to evaluate properly the health property of the food produced. Proposition for converting factors is 0.13 for all types of MSPM and 0.14 for poultry meat products with max. 60% of added MSPM.

17

Chara and Ceratophyllum as a substrate for ciliates in two shallow lakes (Leczna-Wlodawa Lakeland, Eastern Poland)

67%

Mieczan T.

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nr Suppl.1

18

Oddziaływanie zróżnicowanego nawożenia na zawartość fosforu ogółem w glebie płowej oraz w wybranych roślinach uprawnych

67%

Lemanowicz J.

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tom R. 19, nr 1

17-21

PL

W pracy przedstawiono wyniki badań nad zawartością fosforu ogółem w glebie płowej oraz w roślinach uprawianych w trakcie trwania czteroletniego zmianowania. Czynnikiem pierwszym doświadczenia było nawożenie obornikiem, natomiast drugim nawożenie azotem w postaci saletry amonowej. Zastosowane czynniki doświadczalne w istotny sposób modyfikowały całkowitą zawartość fosforu w glebie. Poziom zawartości fosforu w badanej glebie płowej kształtował się również w zależności od uprawianej rośliny w ciągu czterech lat prowadzenia badań. Kumulacja ogólnej zawartości fosforu w roślinach istotnie zależała od zastosowanego nawożenia. Zdolność roślin do pobierania fosforu przez testowane rośliny w badanych warunkach nawożeniowych układał się w następujący sposób: kukurydza>ziemniak>jęczmień jary>pszenica ozima.

EN

The present paper presents the results of research into the content of total phosphorus in Luvisol and in the crops grown throughout the four-year crop rotation. Factor One of the experiment involved FYM fertilisation, while Factor Two - nitrogen fertilisation in a form of ammonium nitrate. The experimental factors applied significantly modified the total content of phosphorus in soil. The level of the total phosphorus content in the Luvisol investigated also depended on the crop throughout the four-year experiment. The accumulation of the total phosphorus content in the plants depended significantly on the fertilisation. The phosphorus uptake capacity of the crops tested under the fertilisation conditions was as follows: maize, potato, spring barley, winter wheat.

19

The importance of hourly nutrient concentration variability in terms of assessment of the surface water state in Slupia Pilot River

67%

Wilk P. , Gebala J. , Orlinska-Wozniak P. , Ostojski M.

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tom 04

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nr 1

EN

Water eutrophication still causes many environmental and social problems, and so better quantification of the amount of nutrient loads discharged into surface waters is required. The basis for eutrophication analysis is data gathered in the frame of State Environmental Monitoring (SEM). In Poland, these measurements are carried out at the frequency of 6-12 times per year and serve as the basis for calculating the amount of nutrient input discharged to the sea. This article presents the results of the analysis of the representativeness of one measurement make two-hourly per day of the variability of total nutrient concentrations. For this purpose three cycles of field studies were carried out in accordance with plant growing season. The measurements were taken in November 2013, February 2014, and June 2014 in the Słupia River, at the site where it flows through the village of Charnowo (river profile). The analysis showed a significant change in the amount of total nutrient concentration during the day (up to 60% for total nitrogen and total phosphorus). This trend was maintained regardless of the stage of plant growth. Therefore, both the date for water sample collection and the time the measurement was taken become important for the subsequent evaluation of nutrient loads discharged into the sea. It is reasonable to assess the level of nutrient loads discharged into the sea not on the basis of a single measurement but based on the continuous registration of nutrients – this allows us to assign a daily average. It is also important from the point of view of the calibration of mathematical models, which are now an essential tool for analysing and forecasting environmental changes, and for which access to detailed data is very important.

20

Role of Lake Symsar in the reduction of phosphorus concentration in surface runoff from agricultural lands

67%

Potasznik A. , Szymczyk S. , Sidoruk M. , Świtajska I. J.

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tom no. 20

39--44

EN

The study was aimed at assessing the role of Lake Symsar in the reduction of phosphorus delivered mainly by the Symsarna River. Studies were carried out since March 2011 till October 2013 in the catchment basin of Lake Symsar situated in north-eastern Poland. Every month surface water samples representative for the catchment were taken for phosphate-phosphorus (PO4-P) and total phosphorus (TP) analyses. Obtained results were analysed with the distinction of vegetative and non-vegetative season. Lake Symsar is the last water body in the Symsarna River system. The river divides the lake into main basin and a bay part. Concentrations of PO4-P were higher by 17% in the former than in the latter part, TP concentrations showed reverse proportions. The highest concentrations of TP were noted in a forest stream and the highest concentrations of PO4-P in the Tolknicka Struga. Reduced concentrations of both P forms were found in waters of the Symsarna River downstream its outflow from the lake. With respect to the concentrations of PO4-P and TP, waters of the Symsarna River up- and downstream the lake were ascribed to the 1st class of water quality. Through-flow Lake Symsar improves the quality of waters (the Symsarna River and smaller streams) draining agricultural catchment by the reduction of concentrations of phosphorus compounds.

PL

Celem badań była ocena roli jeziora Symsar w zmniejszaniu ilości fosforu, dopływającego do akwenu głównie rzeką, Symsarna. Badania nad wpływem jeziora Symsar w zmniejszaniu stężenia fosforu pochodzącego ze zlewni rolniczej były realizowane od marca 2011 do października 2013 r. w zlewni jeziora Symsar usytuowanego w północno-wschodniej Polsce. Obejmowały comiesięczne pobieranie próbek wody powierzchniowej, reprezentatywnych dla badanej zlewni, w celu przeprowadzenia analizy oceny zawartości w nich fosforu fosforanowego (PO4-P) oraz ogólnego (TP). Uzyskane wyniki poddano analizie z uwzględnieniem sezonu wegetacyjnego i pozawegetacyjnego. Jezioro jest ostatnim zbiornikiem w systemie rzeki Symsarna. Rzeka dzieli akwen na dwie części – akwen główny oraz część zatokową. W wodach głównego akwenu stężenie fosforu fosforanowego było o 17% większe niż w części zatokowej, z kolei zawartość fosforu ogólnego była mniejsza. Największą koncentrację odnotowano w wodzie cieku leśnego (TP) oraz Tolknickiej Strugi (PO4-P). W wodzie rzeki Symsarna, poniżej wypływu z jeziora zaobserwowano zmniejszenie zawartości badanych form fosforu. Ze względu na zawartość fosforu fosforanowego oraz fosforu ogólnego wody rzeki Symsarna powyżej oraz poniżej jeziora kwalifikowały się do I klasy jakości. Przepływowe jezioro Symsar – poprzez zmniejszenie zawartości form fosforu w wodach rzeki Symsarna – wpłynęło na poprawę jakości wód odpływających z akwenu.