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Wyszukujesz frazę "stratification condition" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Stratyfikacja warunków higrotermicznych nad ekosystemem trawiastym w terenie otwartym i na granicy lasu
Stratification of thermo-hygrometric conditions of a grassy ecosystem in the open area and on the edge of a forest
Autorzy:
Panfil, M.
Lesny, J.
Alberski, J.
Powiązania:
https://bibliotekanauki.pl/articles/35966.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
laki
badania srodowiskowe
temperatura powietrza
stratyfikacja
warunki termiczne
warunki wilgotnosciowe
mikroklimat
uzytki zielone
meadow
environment research
air temperature
stratification
thermal condition
moisture condition
microclimate
grassland
Opis:
Praca jest analizą mikroklimatu obszaru łąkowego, w obrębie Stacji Dydaktyczno-Badawczej w Bałdach, zlokalizowanej na Pojezierzu Olsztyńskim. Badania zrealizowano w oparciu o zasoby użytków zielonych stacji, przeznaczane przede wszystkim na wypas bydła w okresie od pierwszej dekady maja do końca października. W celu sprawdzenia wskaźników termicznych i wilgotnościowych wykonano obserwacje temperatury powietrza i wilgotności względnej na 6-ciu wysokościach: 0,05 m; 0,5 m; 1,0 m; 1,5 m; 2,0 m; 3,0 m; 4,0 m w dwóch wybranych punktach. Zostały one zlokalizowane nad ekosystemem trawiastym w terenie otwartym i na granicy z lasem. Dane o temperaturze powie-trza były zapisywane z częstotliwością 5-cio minutową w dwóch seriach pomiarowych: wiosną i jesienią, każdorazowo przez pięć dni. W wyniku pomiarów otrzymano unikalne rozkłady dobowe i godzinowe na poszczególnych wysokościach, które świadczą o znacznym zróżnicowaniu mikroklimatycznym poszczególnych punktów.
The work is the analysis of the microclimatic conditions over the grassland ecosystem within the Teaching and Research Station in Bałdy, located in the Olsztyn Lake District. The study was carried out based on the resources of grassland station, devoted primarily to cattle grazing in the period from the first decade of May to end of October. In order to verify the thermal and moisture indicators, observations were made of air temperature and relative humidity for six heights: 0.05 m; 0.5 m; 1.0 m; 1.5 m; 2.0 m; 3.0 m; 4.0 m at the two selected points. They were located above the grassland ecosystem in the open area and at the border of the forest. Data on air temperature were recorded at a frequency of 5-minute measurements in two series : spring and autumn, each time for five days. As a result of the measurements, unique schedule of daily and hourly values at various altitudes were obtained. They show that the microclimates of the individual points are clearly differentiated.
Źródło:
Acta Agrophysica; 2014, 21, 2
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diurnal variations in nitrogen, phosphorus and iron compounds in the Southern Baltic Sea
Autorzy:
Sikorowicz, G.
Falkowska, L.
Burska, D.
Dunajska, D.
Pryputniewicz, D.
Magulski, R.
Lewandowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/47649.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
iron
nutrient
Gdansk Deep
nitrogen
density stratification
diurnal variation
Baltic Sea
oxygen condition
phosphorus
Opis:
In order to assess their short-term variability, nutrient concentrations were measured at standard depths at 2 h intervals in the deepest region of the Gdańsk Deep during the first ten days of June 2001. The mean concentrations of nutrients in the euphotic zone were: NN (NO2 −, NO3 −, NH4 +) – 1.93 μmol dm−3, PO4 3− – 0.12 μmol dm−3 and Fetot – 0.11 μmol dm−3. During daylight hours, when the rate of assimilation was fastest, concentrations of nitrogen, phosphorus and iron compounds were very low. The phosphate concentration fell to a minimum (0.03 μmol dm−3) between 04:00 and 10:00 hrs, while total iron dropped to 0.01 μmol dm−3 between 10:00 and 16:00 hrs. Both levels were below the limiting values for phosphorus and iron. At night, concentrations of NO3 − and PO4 3− rose by 25%, those of NH4 + and Fetot by 35%. The mean molar ratios of NN:PO4 3− and Fetot:PO4 3− in the surface layer were subject to significant daily fluctuations. The molar NN:PO4 3− ratio was higher than the optimum value established for the Baltic Sea. Below the halocline, the concentrations of dissolved iron and phosphorus rose as a result of diffusion from sediments in response to changing redox conditions.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Processes and factors influencing the through-flow of new deepwater in the Bornholm Basin
Autorzy:
Stigebrandt, A.
Powiązania:
https://bibliotekanauki.pl/articles/49102.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
hydrographic condition
Bornholm Basin
salinity
oxygen concentration
vertical stratification
deep water
Baltic Sea
Opis:
This paper is based on the idea that the hydrographical conditions in the Bornholm Basin, and any other basin, can be understood from knowledge of general hydromechanical principles and basin-specific factors. Published results on the variability of the vertical stratification are shown and discussed. Such analyses demonstrate the residence time of water at different depth levels. Different modes of currents forced by winds and by stratification gradients at open vertical boundaries are presented. Vertical mixing is discussed and published results for the Bornholm Basin are shown. An experiment demonstrates that the diffusive properties of the enclosed basin, i.e. below the sill depth of the Słupsk Furrow, can be computed quite well from the horizontal mean vertical diffusivity obtained from historical hydrographical observations. A published two decades long simulation of the vertical stratification shows that the through flow and modification of new deepwater in the Bornholm Basin can be well described based on existing knowledge regarding crucial hydromechanical processes. It also suggests, indirectly, that there should be a weak anticyclonic circulation above the sill depth, which is supported by current measurements.
Źródło:
Oceanologia; 2017, 59, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stratification conditions determining seed dormancy release of European bladder nut [Staphylea pinnata L.]
Autorzy:
Tylkowski, T
Powiązania:
https://bibliotekanauki.pl/articles/57767.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Staphylea pinnata
stratification condition
botany
sowing pretreatment
European bladder nut
germination
seed dormancy
shrub
Opis:
European bladder nut has its northern limit in Poland and is legally protected. Climatic conditions, edible seeds attractive for small animals and seed dormancy to a large extent affect its restocking under natural conditions. The aim of this study was to determine conditions for seed dormancy release. Nuts dried after collection to ca 11% of moisture content (fresh weight basis) may be stored without loss of seed viability for over 1 year in a cold store at the temperature of -3oC. For the purpose of seed dormancy release nuts need to be stratified. Seed dormancy release was found highest after the application of warm-followed-by-cold stratification, first for 4-6 weeks at the temperature of 15oC or at cyclically alternating temperature of 10~20oC (24+24 h/cycle), followed by 16-18 weeks at 3oC. Seeds germinate at 3oC with the same rate as at cyclically alternating temperature of 3~15oC (16+8 h/day). Drying of nuts at room temperature to approx. 11% during the warm stratification phase (after 2 or 4 weeks) and further stratification resulted in a significant increase in seed germinability. In some seed lots scarification of nuts (dried during the warm stratification phase) contributes to a further significant increase of seed germinability.
Źródło:
Acta Societatis Botanicorum Poloniae; 2007, 76, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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