Wyniki wyszukiwania

1

Root hair branching under conditions of water stress in Arabidopsis

100%

Bobrownyzky J.

Acta Physiologiae Plantarum

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2007

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tom 29

|

nr 1 Suppl.

2

Statistics of underwater acoustic signals scattered by the rough water surface covered with a layer of oil substances

86%

Pogorzelski S. J.

Oceanologia

|

1989

|

tom 27

3

Rainfall and water conditions in the region of the upper glacial in Europe

86%

Szwejkowski Z., Draganska E., Cymes I., Timofte C. M., Suchecki S., Craciun I.

Meteorology Hydrology and Water Management. Research and Operational Applications

|

2017

|

tom 05

|

nr 1

The article contains descriptive statistics on rainfall in an area of the southern part of the last ice age in Europe, and which now comprises the north-eastern part of the Poland. The study covers the period of 1981-2010. The sums of the annual and monthly precipitation were calculated, while years and months were evaluated in relation to the multi-annual and monthly averages. The frequency of daily precipitations was also determined. Values of SPI (Standarized Precipitation Index) were calculated together with the values of the Selianinov Index, which measures the environmental aspect of precipitation. The average annual rainfall showed a spatial heterogeneity in the region from 700.1 mm (Elblag in the north-west) to 555.3 mm (Mława) in the east and south-east. The greatest precipitation occurred in the last decade of the analysed period of thirty years. However, statistical analysis shows no significant trend change in precipitation during this period. The number of years with sums of precipitation below 75% of the normal turned out to be very small. In the annual cycle, summer precipitation prevailed. On a monthly basis, the averages sometimes exceeded the multiyear averages by as much as 200%, while extreme lows in monthly precipitation reached levels below 25% of the long-term averages. The calculated value of the SPI indicated that the most common drought conditions occurred in May and June; such droughts did not occur in April and July. The Selianinov Index indicates that the least favorable hydrothermal conditions occur in April and May, while the most favorable conditions occur in August and September.

4

Changes in the structure and nutrition preference of the protozoa community in standing water developed from running water

86%

Bereczky M. C.

Acta Protozoologica

|

1991

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tom 30

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nr 1

5

Historical changes of the Warta channel patterns within the Poznan area

86%

Kaniecki A.

Quaestiones Geographicae

|

1989-1990

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tom 15-16

6

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

The flood extent in the lower Biebrza basin calculated by the 1D flow model for different land use scenarios

72%

Szporak S., Miroslaw-Swiatek D., Chormanski J.

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

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2008

|

tom 40

7

Changes in vegetation cover of Lower Silesian monumental parks due to degradation of drainage system and concepts of their restoration

72%

Lis A.

Electronic Journal of Polish Agricultural Universities. Series Environmental Development

|

2007

|

tom 10

|

nr 3

8

Seed germination requirements of Ficus virens (Moraceae) as adaptation to its hemi-epiphyte life form

72%

Ji M., Qin H., Chen H., Wen B.

Polish Journal of Ecology

|

2018

|

tom 66

|

nr 1

Epiphytes and hemi-epiphytes are important floristic, structural and functional components of tropical rainforests. Their specific responses to light, temperature and water conditions during seed germination allow them to coexist with tropical forest trees. Here we investigated the effects of temperature, red to far-red light ratio (R:FR ratio) and water stress on seed germination of Ficus virens in tropical seasonal rainforest in Southwest China. We used incubators to create required temperature regimes, polyester filters to produce R:FR ratio gradients and mannitol solutions to simulate water stress. It was found that seed germination of F. virens was inhibited in the simulated understory conditions, i.e., at lower temperature (22/23°C), especially when combined with the R:FR ratio of 0.25, for which the germination percentage was less than 20%. In contrast, the seed germination percentages in the simulated canopy environment (22/32°C) showed no significant difference between R:FR ratios, with an average seed germination percentage as high as 65.8%. Seed germination delayed and decreased along with increasing water stress and was completely inhibited at -2.5 MPa, which might suggest that it is a kind of adaptation for F. virens seeds to detect the rainy season as germination chance on the canopy. Therefore, our study revealed the physiological mechanism for F. virensto be able to adapt to canopy environment.

9

Formation of Arctic soils in Chamberlindalen, Bellsund, Spitsbergen

72%

Melke J., Chodorowski J.

Polish Polar Research

|

2006

|

tom 27

|

nr 2

119-132

Soils in the Chamberlindalen area (Bellsund, Spitsbergen) have been formed under polar climatic conditions, influenced by many years of permafrost, and chemical and physical weathering. The type of bedrock and local water conditions are considered to be significant soil-forming factors. The following soil units were distinguished according to the FAO-UNESCO Revised Legend (1997): Gelic Leptosols, Gelic Regosols, Gelic Gley- sols, and Gelic Cambisols. The basic properties of the soils studied are (i) shallow soil profile with poorly differentiated genetic horizons, (ii) the particle size distribution of sands and loams, (iii) a considerable content of the silt fraction, (iv) different pH, and a considerable organic carbon content.

10

Warunki wodne a prace urzadzenioworolne

72%

Solarski H., Nowicki Z., Blaszczyk M.

Acta Academiae Agriculturae ac Technicae Olstenensis. Geodaesia et Ruris Regulatio

|

1993

|

tom 22

27-32

11

Impact of a road crossing on groundwater level in a river valley

72%

Mioduszewski W.

Journal of Water and Land Development

|

2008

|

nr 12

12

Anthropogenic changes in water conditions in the Lublin area

72%

Michalczyk Z., Los M. J.

Geographia Polonica

|

1997

|

tom 68

13

The effect of water conditions on the phenology and age structure of Luronium natans [L.] Raf. populations

72%

Szmeja J., Bazydlo E.

Acta Societatis Botanicorum Poloniae

|

2005

|

tom 74

|

nr 3

The study presents the results of the analysis of development stages of Luronium natans (L.) Raf. depending on water conditions (pH, light, total nitrogen, total phosphorus, organic carbon) in 21 populations in north-western Poland. The fractions of seedlings, juvenile, mature and generative stems, as well as the course of phenological phenomena were determined. Seedlings are sparse and can be found from May to July. Most of them occur in waters ranging from slightly acid to neutral (pH 6.0-7.0) with TP concentrations of 10-20 µg dm-3, TN concentrations < 1.0 mg dm-3 and DOC concentrations of 3.5-5.0 mg dm-3, on a mineral (5-10% OC) and fairly well lit (31-40% PAR) substrate. The generative phase lasts from May to October. The flowering period is between August and mid-September. Only 35.2±9.4% of flowering stems produce fruits. The plant flowers abundantly in waters with total nitrogen concentrations > 1.2 mg dm-3, that is above the level of TN concentrations most favourable to seedlings and both juvenile and mature individuals. TP and DOC concentrations, and light intensity (PAR) do not influence the size of the generative stems fraction in populations. However, sediment structure is of importance in this respect: about 62.9% of stems flower and fruit on a mineral substrate (< 1% OC), whereas only 17.4% do so on an organic one. The results of this study may be useful in the conservation of this endangered European endemic species.

14

Access-II: a detailed model for crop growth and water conditions

72%

Armstrong A. C., Legros J. P., Voltz M.

International Agrophysics

|

1996

|

tom 10

|

nr 3

15

Analysis of changes in water conditions in hydrogenic sites-case study: nature reserve 'Gorbacz'

72%

Mioduszewski W.

Journal of Water and Land Development

|

2000

|

nr 04

In the paper the hydrological conditions of a protected peatland are presented. Some changes of natural flora probably caused by the changes of water conditions, are observed in this area. Analysis indicate that there may be a number of possible causes responsible for the deterioration of aquatic and peatland systems. The lowering of the surface and ground water table was probably triggered by: Digging of ditches for the agriculture purposes. Their negative impact consists primarily in accelerating outflow of spring waters which under natural conditions remained for a long period on the surface of the terrain. Eutrofication of paludic and aquatic sites causing an increase in biomass production (higher evapotranspiration). Occurrence of a series of dry years with low precipitation and high temperatures. The analysis showed as well that it is often difficult to estimate the reasons of water condition changes in hydrogenic sites.

16

Static and dynamic properties of surfactant films on natural waters

72%

Pogorzelski S. J., Kogut A. D.

Oceanologia

|

2001

|

tom 43

|

nr 2

The paper contains the results of natural surface film surface pressure – area experiments carried out in inland waters and shallow offshore regions of the Baltic and Mediterranean Seas during 1990–99 under calm water conditions using the Langmuir trough – Wilhelmy filter paper plate system, which ‘cuts out’ an undisturbed film-covered sea area without any initial physico-chemical sample processing. The limiting specific area Alim (268–3157 ˚A2/molecule−1) and mean molecular mass (0.65–9.7 kDa) of microlayer surfactants were determined from the 2D virial equation of state applied to the isotherms. Film structure signatures were derived from π − A isotherm hysteresis and application of the 2D polymer scaling theory. The stress-relaxation measurements revealed a two-step relaxation process at the interface with characteristic times τ1 (1.1–2.8) and τ2 (5.6–25.6) seconds suggesting the presence of diffusion-controlled and structural organization relaxation phenomena. The results demonstrate that natural films are a complex mixture of biomolecules covering a wide range of solubilities, surface activity and molecular mass with an apparent structural organization exhibiting a spatial and temporal variability.

17

The influence of anthropopressure on water relations in the Wielkopolska Lowland

72%

Kaniecki A.

Geographia Polonica

|

1997

|

tom 68

18

Influence of different management measures on water conditions within the Lower Biebrza Valley

72%

Bielecka J., Wielechowska-Nauta A., Querner E.

Journal of Water and Land Development

|

2005

|

nr 09

19

The importance of redox processes for the formation of water conditions in alluvial soils of the Vistula River delta

72%

Ostrowski J.

Journal of Water and Land Development

|

2001

|

nr 05

Alluvial soils of the Vistula River delta are one of the most fertile soils in Poland. Part of the area is a depression, whose agricultural utilization relies upon the efficient reclamation systems on polders. High ground water levels enhance redox processes, restriction of which is one of more important functions of the draining systems. This paper presents short characteristics of the redox status of alluvial soils in the delta and describes processes and consequences of oxygen deficits in soils. The importance of indices of oxygen deficit for the formation of water conditions, which would favour agricultural utilization of the delta soils, is underlined.

20

Modelling of groundwater table position in the subsurface irrigation on afforested [formerly arable] lands

72%

Kowalczyk T., Chalfen M., Plywaczyk A.

Electronic Journal of Polish Agricultural Universities. Series Environmental Development

|

2005

|

tom 08

|

nr 3

The results of the model tests referring to the water conditions on afforested (formerly arable) lands in Wrocław are presented in this paper. The studies showed that regulated run-off from 90 ha catchments kept groundwater table 50 cm then the non irrigated areas. It was also found that water resources stored in Spring were depleted by June. Its rebuilding in the second part of the vegetation period was possible only when precipitation exceeded the mean value.

Ograniczanie wyników

Root hair branching under conditions of water stress in Arabidopsis

Statistics of underwater acoustic signals scattered by the rough water surface covered with a layer of oil substances

Rainfall and water conditions in the region of the upper glacial in Europe

Changes in the structure and nutrition preference of the protozoa community in standing water developed from running water

Historical changes of the Warta channel patterns within the Poznan area

The flood extent in the lower Biebrza basin calculated by the 1D flow model for different land use scenarios

Changes in vegetation cover of Lower Silesian monumental parks due to degradation of drainage system and concepts of their restoration

Seed germination requirements of Ficus virens (Moraceae) as adaptation to its hemi-epiphyte life form

Formation of Arctic soils in Chamberlindalen, Bellsund, Spitsbergen

Warunki wodne a prace urzadzenioworolne

Impact of a road crossing on groundwater level in a river valley

Anthropogenic changes in water conditions in the Lublin area

The effect of water conditions on the phenology and age structure of Luronium natans [L.] Raf. populations

Access-II: a detailed model for crop growth and water conditions

Analysis of changes in water conditions in hydrogenic sites-case study: nature reserve 'Gorbacz'

Static and dynamic properties of surfactant films on natural waters

The influence of anthropopressure on water relations in the Wielkopolska Lowland

Influence of different management measures on water conditions within the Lower Biebrza Valley

The importance of redox processes for the formation of water conditions in alluvial soils of the Vistula River delta

Modelling of groundwater table position in the subsurface irrigation on afforested [formerly arable] lands