Wyniki wyszukiwania - AGRO

1

The protection of reservoir water against the eutrophication process

100%

Balcerzak W.

Polish Journal of Environmental Studies

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2006

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tom 15

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nr 6

The article analyzes methods for the protection of reservoir water against the eutrophication process. It discusses methods for protection against point-source, spatial and dispersed pollution, biological methods and the most frequently applied technical methods. It pays special attention to the application of mathematical modelling to predict changes in water quality. A simulation of water quality changes in the Dobczyce Reservoir, expressed by a change in the concentration of chlorophyll "a," was made. Calculations were made for different pollutant concentrations and different temperatures. It was found that temperature had an important impact on the course of the process in surface segments and that pollutant load exerted an influence in subsurface segments. In sediment segments, the factors did not practically affect the course of the eutrophication process.

2

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Expected impact of phosphorus fertilization on the eutrophication of terrestrial environment

100%

Sapek A.

Acta Agrophysica

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2001

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tom 52

The aim of this papers is to discuss the expected effect of increasing phosphorus accumulation in cultivated soils. The global consumption of phosphorus fertilisers since 1954 exceeded 1 billion tons of P2O5, and about a half of this amount was used in European countries. More than 95% of mined phosphate rocks are provided to food production. That resulted that the total phosphorus content in agricultural used soils was doubled or tripled in European countries up to now. A further increase of phosphorus accumulation in the- cultivated soils would conduct to eutro- phication of water and terrestrial ecosystems. The euthrophication of surface water is rather good known phenomena, but the euthrophication of terrestrial ecosystem need broader identification. Main sources of phosphorus in environment is food production and consumption. In agriculture, a renewed attentions is required to ensure that phosphorus in modern farming systems is managed in a manner which is sustainable from the point of view of both agriculture and environment. The mitigation of eutrophication originated from phosphorus accumulation in agricultural soils could be achieved only on scientific basis followed with country and regional abatement programs.

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Bacterial secondary production and bacterial biomass in four Mazurian Lakes of differing trophic status

100%

Chrost R. J., Koton M., Siuda W.

Polish Journal of Environmental Studies

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2000

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tom 09

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nr 4

This report presents results of four-year studies of bacterial production and biomass, and selected environmental variables (concentrations of total DOC, microbiologically labile DOC, chlorophylla) in surface pelagic waters of four Mazurian lakes of differing trophic status (oligo/mesotrophic, eutrophic, hypereutrophic, polihumic) during summer stratification periods 1994-97. Bacterial production and biomass were positively proportional to the degree of lake water eutrophication. The rates of production of bacteria and their biomass turnover were primarily dependent on concentrations of microbiologically labile organic substrates in the DOC pool. In lakes with high content of suspended particulate detritus (hypereutrophic and polihumic lakes) attached bacteria significantly predominated in total bacterial production. Importance of the "bottom-up" and "top-down" mechanisms in ecological regulation of bacterial production and biomass in the studied lakes is widely discussed.

4

Cyanobacterial blooms in the Gulf of Gdansk [Southern Baltic]: the main effect of eutrophication

86%

Jozwiak T., Mazur-Marzec H., Plinski M.

Oceanological and Hydrobiological Studies

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2008

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tom 37

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nr 4

115-121

5

Physical and chemical characteristics of water in selected small gardens ponds

86%

Plaska W., Rechulicz J., Tarkowska-Kukuryk M.

Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego

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2014

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tom 11

6

Toxic effect of norharmane on a freshwater plankton community

86%

Mohamed Z. A.

International Journal of Ecohydrology and Hydrobiology

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2013

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tom 13

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nr 3

7

Influence of maize hybrid type (Zea mays l.) and N dose on nitrogen eutrophication of the environment

86%

Szulc P., Rybus-Zalac M., Jagla M.

Electronic Journal of Polish Agricultural Universities. Series Agronomy

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2015

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tom 18

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nr 2

8

Water chemistry of Lake Gilwa

86%

Grochowska J., Tandyrak R.

Journal of Elementology

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2010

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tom 15

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nr 1

89-99

The study was carried on Lake Giłwa (100.8 ha, 9.4 m), in the drainage basin of the Giłwa and Pasłęka rivers. The data obtained in the study allowed the authors to classify Lake Giłwa as a water body belonging to the third stability degree according to Patalas (1960). As evidenced in the study, Lake Giłwa is a highly eutrophic reservoir. The lake waters were characterized by a high content of nutrients, up to 1.40 mg P·dm-3 and 12.47 mg N·dm-3. The high fertility of the lake was also exhibited by the values of BOD5 reaching 7 mg O2·dm-3, chlorophyll a content (73 mg·m-3) and low transparency — 0.7 m. In the peak of the summer, the stagnation oxygen profile is represented by a clinograde curve typical for eutrophic lakes, while carbon dioxide distribution in the water column is shown by a „reverse” clinograde curve, also typical for fertile reservoirs. The study has revealed that the water in Lake Giłwa is well buffered, as shown by the alkalinity values, 2.5-5.0 mval dm-3. Total hardness of the reservoir water varied from 157.1 to 278.8 mg CaCO3·dm-3, which is typical of hard water. The hardness was conditioned mainly by the calcium content. With the River Giłwa, the lake receives wastewater from the wastewater treatment plant in Gietrzwałd, which is manifested, for example, by the high values of electrolytic conductivity (321-476 µS·cm-1), indicating the degree of mineral pollution of the lake. Despite the wastewater input, the amount of chlorides is rather low, 20 mg Cl·dm-3 at the most.

9

Urea in lake ecosystem: the origin, concentration and distribution in relation to trophic state of The Great Mazurian Lakes (Poland)

86%

Siuda W., Kiersztyn B.

Polish Journal of Ecology

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2015

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tom 63

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nr 1

The distribution, concentrations and origin of urea were studied in surface and profundal waters of meso-eutrophic and highly eutrophic parts of The Great Mazurian Lake System (GMLS) during spring — autumn period. Urea concentrations varied from 0.25 µM in surface layer to 3.36 µM in profundal zone of studied lakes and were in the range of concentrations noted in other non-polluted freshwater habitats. In the photic zone of lakes of GMLS Urea N made up to 10 % the total DON pool and often exceeded 2-3 times of NH₄-N concentrations. Pattern of changes in urea concentrations observed during three-years study excludes external urea input and suggests supplementation of lake waters with this compounds by phytoplankton decomposition processes. Generally, urea concentrations were negatively correlated with the trophic state index calculated from “algal” as well as from “bacterial” determinants. However, more detailed analysis showed that the relationships between production and assimilation of urea by various plankton components as well as the ecological role of this compound in meso- and eutrophic lakes could be different.

10

Effects of eutrophication on vendace, Coregonus albula (L.). III. Seasonal morphological variability of vendace from selected lakes in Wielkopolska

86%

Fiszer M., Przybyl A., Andrzejewski W., Mazurkiewicz J., Golski J., Przybylska K., Runowski S.

Archives of Polish Fisheries

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2012

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tom 20

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nr 2

11

Effect of small water reservoir on quality and usable values of surface waters

86%

Policht-Latawiec A., Bogdal A., Pudlo M.

Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego

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2013

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tom 10

12

New approach to trophic state assessment of running waters in Poland

86%

Neverova-Dziopak E., Kowalewski Z.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2013

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tom 01

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nr 1

The problem of eutrophication has, since the 1970s, reached a global scale and become a problem of principal importance due to its negative consequences, which could result in the total loss of biospheric functions of aquatic ecosystems, and also their economic role. The increasing intensity of eutrophication processes and their specificity in various types of waters requires the development of special methods of control and protection of aquatic ecosystems. As a result of the high dynamism of eutrophication and its dependence on different factors (hydrological, hydrodynamic, hydrobiological, morphological, edaphic and climatic conditions), the assessment of trophic status in order to control and manage this process is very complicated. The evaluation of the consequences of anthropogenic eutrophication and the scale of its development can be provided only on the basis of systematic observation during a multi-annual period. Careful analysis of the state of knowledge on the issues related to eutrophication, especially the methods of trophic status assessment, have allowed us to conclude that at present there is no universal methodology for the assessment of the surface water trophic level, while the existing methods have various shortcomings, which reduce the reliability of the results and complicate the development of appropriate technical, organizational and legal protection measures. A critical analysis of trophic status assessment approaches for different categories of waters has also allowed us to state that there is no an appropriate method for the assessment of the trophic status of running waters, since almost all existing assessment methods are developed for lakes and coastal areas. This paper presents an original approach elaborated for the assessment of the trophic state of running waters based on the statistical analysis of long-term monitoring data and numerical criterion ITS, which allows for a simple and low-cost monitoring of eutrophication suitable for the solving of different application tasks in the field of surface water protection.

13

The contribution of agricultural phosphorus to eutrophication

86%

Foy R. H., Withers P. J. A.

Nawozy i Nawożenie

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2002

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tom 04

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nr 3[12]

14

The possibilities of economic efficiency evaluation of the equipment for removal of cyanobacteria from standing waters

86%

Janekova J., Sebo J., Fedorcakova M.

Intercathedra

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2011

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tom 27

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nr 2

The paper suggests to worldwide problem of standing waters eutrophication. It describes one of the possible solutions of the problem - design and application of the electrolytic equipment. It indicates effects of its application in practice. The second part of the paper deals with possibilities of economic efficiency evaluation of development and application of the equipment.

15

Energetic asymmetry connected with energy flow changes in response to eutrophication: a study of multiple fish species in subtropical shallow lakes

86%

Fu H., Zhang H., He L., Sha Y., Zhao K., He Y., Xu J.

Polish Journal of Ecology

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2019

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tom 67

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nr 4

16

Effects of environmental variables on midsummer dinoflagellate community in the Neva Estuary (Baltic Sea)

86%

Golubkov M., Nikulina V., Golubkov S.

Oceanologia

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2019

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tom 61

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nr 2

17

Elodeid species as nursery beds for the successful seed restoration of Vallisneria spiralis L.

86%

Cao J., Ruan H.

Polish Journal of Ecology

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2015

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tom 63

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nr 1

Submerged aquatic vegetation (SAV) is often difficult to restore due to their low seedling survival rates. Therefore, we hypothesized that the elodeid macrophytes serve as effective “nursery” areas to promote success for seedlings of other SAV. However, the high density of the elodeid community may inhibit the establishment of other SAV. An experiment was conducted to explore this “nursery effect” as a restoration approach to increase the success of seed restoration. Two elodeid species were pre-planted into mesocosms to create three levels of “nursery beds” i.e., bare, sparse (approx. 100 g m⁻²) and dense (approx. 200 g m⁻²). Seeds of Vallisneria spiralis were then placed into these beds to test the seed germination and growth of V. spiralis seedlings. After three months, seed germination was lower in the bare treatment than in the sparse and dense treatments. The growth of V. spiralis seedlings was greater in the sparse treatment than in the bare and dense treatments. These results revealed that the established elodeid bed had a positive effect on the seed restoration of V. spiralis but that the restoration efficiency was significantly reduced by the high-density cover of the elodeid community.

18

Making coastal research useful — cases from practice

86%

von Storch H., Emeis K., Meinke I., Kannen A., Matthias V., Ratter B. M. W., Stanev E., Weisse R., Wirtz K.

Oceanologia

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2015

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tom 57

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nr 1

19

Factors affecting the occurrence of algae on the Sopot beach (Baltic Sea)

86%

Filipkowska A., Lubecki L., Szymczak-Zyla M., Lotocka M., Kowalewska G.

Oceanologia

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2009

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tom 51

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nr 2

233-262

The occurrence of algae on the Sopot beach was investigated from 2004 to 2006 from the beach management point of view. Various methods were applied in an attempt to understand the mechanisms underlying the accumulation of algae on the shoreline. They included daily observations of the occurrence of macrophyta on the beach, absorption measurements of acetone extracts of the particulate matter in the seawater, the collection of macrophyta and phytoplankton samples for biomass and taxonomic identification, and determination of the degree of decomposition on the basis of chloropigment analyses. The results were related to the environmental conditions: meteorological data and the physicochemical parameters of the seawater. The biomass recorded on the beach consisted mainly of macroalgae and a small proportion of sea grass (Zostera marina). The phytoplankton biomass consisted mainly of dinoflagellates, diatoms, cyanobacteria, euglenoids and cryptophytes. The conclusions to be drawn from this work are that the occurrence of huge amounts of macrophyta amassing on the Sopot beach depends on the combined effect of high solar radiation in spring and summer, high-strength (velocity × frequency) south-westerly winds in May-September, followed by northerly winds, bringing the macrophyta from Puck Bay on to the Sopot beach. At the same time, their abundance along the beach varies according to the shape and height of the shore, the wind strength and the local wind-driven seawater currents. According to estimates, from 2.2–4.4 × 102 tons (dry weight) of macrophyta can be moved on to the Sopot beach in one hour. In October, strong southeasterly winds can also transport huge amounts of decomposing biomass onshore. The phytoplankton content in the total biomass is negligible, even though at low concentrations its biological activity may be considerable. The intensive phytoplankton blooms observed on the Sopot beach in summer are not always caused by cyanobacteria.

20

Analysis of the use of selected reservoirs in the Wielkopolska province

86%

Waligorski B., Sojka M., Jaskula J., Korytowski M.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2018

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tom 50

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nr 4

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