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    Wyświetlanie 1-8 z 8
    Tytuł:
    Seasonal influence of physico-chemical parameters on phytoplankton diversity, community structure and abundance at Parangipettai coastal waters, Bay of Bengal, South East Coast of India
    Autorzy:
    Vajravelu, M.
    Martin, Y.
    Ayyappan, S.
    Mayakrishnan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/47903.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    phytoplankton
    community structure
    abundance
    seasonal variation
    nutrient dynamics
    physicochemical parameter
    Parangipettai
    coastal water
    Bengal Bay
    India coast
    Źródło:
    Oceanologia; 2018, 60, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High resolution 3D-ecosystem model for the Neva Bay and Estuary - model validation and future scenarios
    Autorzy:
    Korpinen, P.
    Kiirikki, M.
    Rantanen, P.
    Inkala, A.
    Sarkkula, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48047.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    biomass
    water protection
    St.Petersburg
    chlorophyll a
    phosphorus precipitation
    municipal waste water
    ecosystem
    phytoplankton
    nutrient dynamics
    Neva Estuary
    Neva Bay
    Opis:
    We have used a simple 3D-ecosystem model to describe nutrient dynamics and biomass production in the Neva Bay off St.Petersburg. The River Neva is responsible for carrying the waste waters of St. Petersburg to the Gulf of Finland. Literature values of chlorophyll-a concentrations and satellite images have been used for model validation. The results indicate that our model can reproduce both the temporal and spatial variation in the phytoplankton biomass with reasonable accuracy. The model was used to analyse scenarios describing the ecological effects of planned water protection measures. More efficient phosphorus purification was found to be the most effective measure for improving the water quality off St.Petersburg.
    Źródło:
    Oceanologia; 2003, 45, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long-term cyanobacterial dynamics as related to physicochemical water parameters in a restored urban lake
    Autorzy:
    Zebek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189822.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    Cyanoprokaryota
    dynamics
    physicochemical parameter
    water parameter
    urban lake
    lake
    restoration
    nutrient
    Opis:
    The aim of this study has been to determine the response of cyanobacteria to the lake protection and restoration measures implemented in the littoral zone of an urban lake called Jeziorak Mały. The first investigations were conducted in 1996 and were resumed in 1997-2003, 2005 and 2013, following the installation of a separator and the creation of stone accumulation sites. Long-term changes in phytoplankton cyanobacterial proportions, abundance and biomass were analyzed in relation to environmental conditions at the sites in the littoral zone (S – separator pipes, K – sites with stones and R – sites with macrophytes). Relationships between cyanobacteria and water chemistry variables were analyzed by calculating the Spearman’s rank correlation coefficient, and then with canonical correspondence analysis (RDA). The results provided evidence that water temperature, total nitrogen and iron concentration (S, R), but also PO43- in spring (S,K) were the principal factors affecting cyanobacterial development. There was a significant decrease in the share, abundance and biomass of cyanobacteria coinciding with a decrease in conductivity and PO43- following the onset of lake restoration efforts. Changes in dominant species from the ones typical in hypertrophic lakes to those typically found in eutrophic lakes took place during the research. The modifications indicated a strong initial response of cynaobacteria to the restoration measures, but the situation stabilized in 2013, when cyanobacteria returned to their previous average levels. This suggests that the introduction of lake restortation measures contributed to the lake’s improved water quality and they should be retained for efficient lake management in the future.
    Źródło:
    Journal of Elementology; 2016, 21, 1; 269-282
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long-term cyanobacterial dynamics as related to physicochemical water parameters in a restored urban lake
    Autorzy:
    Zebek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/16004.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    Cyanoprokaryota
    dynamics
    physicochemical parameter
    water parameter
    urban lake
    lake
    restoration
    nutrient
    Opis:
    The aim of this study has been to determine the response of cyanobacteria to the lake protection and restoration measures implemented in the littoral zone of an urban lake called Jeziorak Mały. The first investigations were conducted in 1996 and were resumed in 1997-2003, 2005 and 2013, following the installation of a separator and the creation of stone accumulation sites. Long-term changes in phytoplankton cyanobacterial proportions, abundance and biomass were analyzed in relation to environmental conditions at the sites in the littoral zone (S – separator pipes, K – sites with stones and R – sites with macrophytes). Relationships between cyanobacteria and water chemistry variables were analyzed by calculating the Spearman’s rank correlation coefficient, and then with canonical correspondence analysis (RDA). The results provided evidence that water temperature, total nitrogen and iron concentration (S, R), but also PO43- in spring (S,K) were the principal factors affecting cyanobacterial development. There was a significant decrease in the share, abundance and biomass of cyanobacteria coinciding with a decrease in conductivity and PO43- following the onset of lake restoration efforts. Changes in dominant species from the ones typical in hypertrophic lakes to those typically found in eutrophic lakes took place during the research. The modifications indicated a strong initial response of cynaobacteria to the restoration measures, but the situation stabilized in 2013, when cyanobacteria returned to their previous average levels. This suggests that the introduction of lake restortation measures contributed to the lake’s improved water quality and they should be retained for efficient lake management in the future.
    Źródło:
    Journal of Elementology; 2016, 21, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics, structure and chemistry of litterfall in headwater riparian forest in the area of Middle Pomerania
    Autorzy:
    Jonczak, J.
    Olejniczak, M.
    Parzych, A.
    Sobisz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/15438.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    litter fall
    dynamics
    structure
    chemistry
    nutrient
    heavy metal
    headwater area
    riparian forest
    Pomeranian region
    Opis:
    The following research on plant litterfall mass, dynamics, structure and chemistry was conducted from 2012 to 2014, on a 40- to 86-year-old stand of black alder (Alnus glutinosa) growing in a headwater area of the upper part of the valley of the Kamienna Creek (Middle Pomerania). Litterfall was collected every month with 20 circular traps, dried untill constant weight, divided into fractions, weighed and analyzed. The annual amount of litterfall deposited on soil during the study period ranged from 3482.5 to 4106.9 kg·ha-1, showing a dynamics pattern typical of temperate decidous forests. Leaves constituted the major fraction of litter with share of between 78.0 and 81.6% in its total mass. The contribution (in %) of twigs was 4.9-5.6, flowers 2.8-8.3, fruits 0.2-0.9 and other components 7.6-9.2. The relatively stable environmental conditions of headwater areas and the absence of disrupting factors during the study period were reflected in the low temporal variability of litterfall mass, dynamics and chemical composition of its individual fractions. The average annual pH of litterfall was 4.33-4.57. In general, litter was relatively rich in nitrogen and calcium but poor in phosphorus, potassium and magnesium. The content of Fe, Al and Mn was characteristic for these elements and low when compared to the other macroelements. The low contents of Cu and Zn confirm limited anthropogenic contamination of the investigated ecosystem with these metals. The annual return of the elements to the soil formed a series C>N>Ca>K>Mg>P>Mn>Fe>Al>Zn>Sr>Cu. A relatively large influx to the soil was noticed for nitrogen and calcium. Meanwhile, it was low for potassium, magnesium and phosphorus.
    Źródło:
    Journal of Elementology; 2016, 21, 2
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling the seasonal dynamics of marine plankton in the Southern Baltic Sea. Part 2. Numerical simulations
    Autorzy:
    Dzierzbicka-Glowacka, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/48617.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    turbulence
    nutrient
    Clupea harengus
    encounter rate
    marine plankton
    Baltic Sea
    microzooplankton
    phytoplankton
    modelling
    Pseudocalanus elongatus
    seasonal dynamics
    Opis:
    This work presents numerical simulations of the time-dependent vertical distributions of phytoplankton, microzooplankton, Pseudocalanus elongatus, early juvenile herring (Clupea harengus) and two nutrient components (total inorganic nitrogen and phosphate) using the 1D-Coupled EcosystemMo del with a highresolution mesozooplankton (herbivorous copepods) module for P.elongatus and a simple prey-predator model for early juvenile herring C. harengus. This m odel was discussed in detail in Part 1. The calculations were done for one year (1999) for a station in the Gdańsk Deep (southern Baltic Sea). The results of the simulations were compared with the mean concentrations of nutrients, phytoplankton and zooplankton recorded in situ. The differences between the calculated and mean recorded values of nutrients and phytoplankton are c. 5–30% and depend on the month and depth for which the calculations were done. However, the calculated depth-integrated biomass of P. elongatus differs fromthe mean recorded value. This difference ranges from30 to 50% at the end of May. The 1DCEM model can be used to forecast ecological changes in the southern Baltic Sea.
    Źródło:
    Oceanologia; 2006, 48, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Guelph permeameter measurements of the topsoil and upper subsoil hydraulic conductivity for characterising the structural state of arable lands
    Autorzy:
    Dolezal, F.
    Kuraz, V.
    Poruba, M.
    Soukup, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/24948.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    hydraulic conductivity
    arable land
    soil structure
    soil water
    moisture content
    infiltration measurement
    nutrient regime
    structure dynamics
    soil moisture
    soil texture
    Źródło:
    International Agrophysics; 1997, 11, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of zinc foliar application at an early stage of maize growth on patterns of nutrients and dry matter accumulation by the canopy. Part I. Zinc uptake patterns and its redistribution among maize organs
    Wplyw dolistnego stosowania cynku we wczesnej fazie wzrostu kukurydzy na wzorce akumulacji skladnikow pokarmowych i suchej masy przez lan. Cz.I. Wzorce akumulacji cynku i rozmieszczenie skladnika miedzy organami rosliny
    Autorzy:
    Grzebisz, W
    Wronska, M.
    Diatta, J.B.
    Dullin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/14324.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    redistribution
    maize organ
    nutrient
    plant cultivation
    zinc uptake pattern
    zinc
    accumulation dynamics
    growth early stage
    canopy
    dry matter
    zinc accumulation
    environment protection
    foliar application
    maize
    Opis:
    As reported in the paper by Grzebisz et al. (this issue), maize crop treated foliarly with fertilizer zinc at early stages of growth produced significantly high yields. Growth analysis procedures were applied to explain various effects of fertilizer zinc on grain yield increase and zinc accumulation and redistribution among maize organs in the course of the growing season. Therefore, based on the obtained zinc uptake characteristics, two major and one minor, but time-separated hot spots of zinc accumulation by maize plants have been distinguished. The first one, as described by RUR-Zn data, extended from the BBCH7 to BBCH9 stages. The second one, as expressed by CUR-Zn data, appeared during the milk stage of kernels growth and could be decisive for kernels sink capacity for accumulating carbohydrates. A minor hot spot, which occurred at tasselling may be responsible for pollen production and activity. The first zinc hot spot has also revealed the diagnostic problem of soil and plant tests for zinc. Current tests tend to overestimate plant zinc nutritional status, and therefore need to be urgently revised. Vegetative organs such as leaves and stems were only the minor sources of zinc for developing maize kernels. During grain filling period, most zinc absorbed by maize plants originated from soil resources.
    Z pracy wynika, że kukurydza traktowana dolistnie nawozem cynkowym we wczesnej fazie rozwoju wydała większe plony ziarna. Celem wyjaśnienia mechanizmu działania nawozu cynkowego na plony ziarna i na akumulację cynku przez rośliny w okresie wegetacji zastosowano procedury analizy wzrostu. Na podstawie parametrów pobrania cynku, wyznaczono dwie główne i jedną drugorzędną fazę krytyczną akumulacji tego pierwiastka przez kukurydzę. Pierwsza faza, opisana przez RUR-Zn, pojawiła się w okresie od 7. (BBCH 17) do 9. liścia (BBCH 19) i była prawdopodobnie związana z inicjacją zawiązków kwiatowych. Druga, reprezentowana przez CUR-Zn, zaznaczyła się w fazie dojrzałości mlecznej ziarniaków i mogła wpływać na zdolność ziarniaków do akumulacji węglowodanów. Trzecia faza krytyczna, pojawiająca się w fazie wiechowania, wiąże się prawdopodobnie z produkcją i żywotnością pyłku. Pierwsza faza krytyczna ujawniła także problem wiarygodności obecnych testów glebowych i roślinnych dla cynku, które przeszacowują stan odżywienia kukurydzy cynkiem i wymagają pilnej rewizji. Organy wegetatywne, takie jak liście i źdźbła, nie były głównymi źródłami cynku dla rosnących ziarniaków kukurydzy. W fazie nalewania ziarna kukurydza pobierała większość cynku z zasobów glebowych.
    Źródło:
    Journal of Elementology; 2008, 13, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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