Wyniki wyszukiwania

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Determination of water retention characteristics of organic soils, using the indirect filter-paper method

100%

Oleszczuk R., Zajac E., Hewelke E., Wawer K.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2018

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tom 17

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nr 2

The paper describes the filter-paper method as an indirect method for the estimation of the pF characteristics. In this method, no direct measurements of soil water potential (pF) are performed, but the latter is determined on the basis of the gravimetric moisture content of the filter paper, which is in contact with the analysed soil samples. Therefore, there is a need to establish a calibration equation that would express the relationship between the value of the soil water potential (pF) and the gravimetric moisture content of the filter paper. The calibration procedure was performed using standard measurement methods of determining pF curves (sand box, pressure plates) and filter paper (Whatman no 42). Based on the research conducted, calibration curves were developed for the filter-paper method, for the analysed sapric (drainic) histosoles, developed from moss and alder peats of medium (hemic) and strong (sapric) degree of decomposition, originating from the mid-basin of the Biebrza river. The proposed calibration curves were presented as 3-degree polynomial equations. The aforementioned equations can be used for the estimation of retention characteristic for sapric (drainic) histosoles, showing similar properties and comparable degree of secondary decomposition of the peat mass.

2

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Changes in runoff as an indicative measure of water retention status in the Bialowieza Primeval Forest

88%

Tyszka J., Stolarek A.

Folia Forestalia Polonica. Series A . Forestry

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2013

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tom 55

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nr 2

The study concerned changing status of water retention within an unique nature complex of the Białowieża Primeval Forest. The retention was evaluated based on an analysis of research results on water outflow from the lowland catchment of the river Łutownia – representative for physiographic conditions as well as those of habitats and tree stands in Poland’s part of the Forest. The catchment in the lowland hydrometric dissection at the Pogorzelce village – Old Białowieża Wilderness, covers the area of 120.1 km2 with natural flow conditions preserved. A unified sequence of measurements carried out since 1966 using unchanged methodology with respect to precipitation, air temperature and forest management status allowed to separate different phases of changes occurring in water resources of this protected forest complex. There were appraised periodical runoff changes and cycles including a decrease in water resources which occurred at the turn of the century. The retention capacity of the catchment was determined based on periodical changes in rainfall-runoff relations and the ongoing process of deteriorating water conditions of forest ecosystem was interpreted.

3

Water retention time in intermittently dosed sand filters

88%

Blazejewski R., Murat-Blazejewska S.

Polish Journal of Environmental Studies

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2009

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tom 18

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nr 2

289-292

This paper presents a simple theoretical approach to calculating of the retention time of water and/or wastewater in intermittently dosed filters. It assumes that a single dose of water is completely mixed with the previously stored water in the filter and that the field capacity of the granular medium is achieved before the next wastewater application. Retention time is weighted by the water volume stored within the filter. It is presented in a discrete form. The model was successfully validated on the basis of empirical data gathered by Schudel and Boller.

4

Potential water retention capacity of forest areas - an example of the Experimental Forest Range Unieszow

88%

Grajewski S., Krysztofiak A., Miler A. T.

Journal of Water and Land Development

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2009

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nr 13a

5

Changes in the hydrophysical properties of peat soils under anthropogenic evolution

88%

Rovdan E., Witkowska-Walczak B., Walczak R., Slawinski C.

International Agrophysics

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2002

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tom 16

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nr 3

6

Using of geocomposite with superabsorbent synthetic polymers as water retention element in vegetative layers

88%

Orzeszyna H., Garlikowski D., Pawlowski A.

International Agrophysics

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2006

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tom 20

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nr 3

7

Agrophysical methods of water retention control in the rural areas

88%

Walczak R. T., Glinski J., Slawinski C., Lamorski K.

International Agrophysics

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1998

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tom 12

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nr 4

8

Hydrophysical characteristics of aggregates: Orthic Podzol, Eutric Cambisol, and Orthic Luvisol. Part II. Water retention curves

88%

Witkowska-Walczak b.

Polish Journal of Soil Science

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1997

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tom 30

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nr 2

9

Assessment of the possibility of applying selected pedotransfer functions for indicating the retention of forest soils in Poland

75%

Hewelke P., Hewelke E., Cholast S., Zakowicz S., Lesak M.

Przegląd Naukowy. Inżynieria i Kształtowanie Środowiska

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2017

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tom 26

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nr 3[77]

Assessment of the possibility of applying selected pedotransfer functions for indicating the retention of forest soils in Poland. Landscape retention influences the water balance of a catchment and the course of flooding events. The degree of retention capabilities of forest soils are much less known than the retention of land used for agriculture. Soil retention capacity influences the formation of a given forest habitat type, floristic species composition, as well as the type and quality of the stand of trees. The analysis was carried out for a regression model dedicated to selected forest soils within the area of Poland, as well as van Genuchten’s and Wösten’s, and Varallyay’s and Mironienko’s models. In order to assess the fit of the models, an independent series of forest soils were used. The models prepared for soils used for agricultural purposes do not result in statistically acceptable fit when it comes to the analyzed forest soils. The analysis of measured and calculated values of total available water indicate good fit of the regression model developed for the analyzed group of podzolic and brown forest soils.

10

Scaling the hydraulic functions of a water repellent sandy soil

75%

Stoffregen H., Wessolek G.

International Agrophysics

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2014

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tom 28

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nr 3

The heterogeneity of both unsaturated hydraulic conductivity and water retention was measured with a high spatial resolution on a transect using an evaporation method. Fifteen undisturbed 100 cm 3 soil cores were taken on a transect every 10 cm from the topsoil of a water repellent sandy site. Five dynamic water retention curves and four unsaturated conductivity curves were determined for each core. We conducted measurements without further saturation in the laboratory in order to achieve field-like conditions. The initial water contents were hetero- geneous, indicating different hysteretic conditions and water repellent areas. The scattering of the water retention curves was high, while the heterogeneity of unsaturated conductivity curves was unexpectedly low. Two scaling approaches were used to describe the heterogeneity: one with and one without considering hysteresis. The concept of scaling applies well to describing the heterogeneity of both hydraulic functions. Including hysteresis leads to similar results than excluding hysteresis. The distribution of the hydraulic conductivity and the water retention were inde- pendent from each other. The results give important information for numerical simulation of the water flow with heterogeneous hydraulic functions.

11

Water budget of the Zdworskie Lake in 2008–2012 period

75%

Popek Z., Wasilewicz M., Bankowska A., Boczon A.

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

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2013

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tom 45

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nr 1

The paper presents the results of water balance calculations for the Zdworskie Lake, Poland, based on meteorological and hydrological data of 2008–2012 period. Meteorological data have come from automatic measurement station located near Łąck in a distance of about 7.5 kilometer from geometric center of the Zdworskie Lake. The station is a part of the monitoring system of The State Forests National Forest Holding. Hydrological data has been collected from five water-gauging stations located in the Wielka Struga River catchment to which belongs the Zdworskie Lake. The water-gauging stations has been established by Department of Water Engineering of Warsaw University of Life Sciences – SGGW within monitoring net constructed as a part of the Restoration Programme of the Lakes in the Łąck Commune, Płock district. Water balance calculations revealed that throughout the analyzed period the retained water amount in Zdworskie Lake should be much larger than it was actually observed. Groundwater level fluctuations observed in one of the water-gauge sections together with geological conditions in the immediate lake catchment area suggest periodic outflow of the lake water into the ground. In the years 2008–2012 the annual loss of lake water caused by the groundwater alimentation varied ranging from about 761,000 to 2,078,000 m3.

12

The influence of utilising reduced tillage systems on the retention properties of rendzina

75%

Pranagal J.

Polish Journal of Soil Science

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2007

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tom 40

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nr 1

A field experiment was carried out (1994–1999) on mixed chernozem rendzina originating from cretaceous bedrock. Three cultivation systems were used: conventional tillage (CT), ploughless tillage (PL), and direct drilling (DD). The simplified cultivation systems marginally influenced the water retention ability of the soil. Water retention properties of rendzina were most favourably shaped under CT, while PLresulted in a slight worsening when compared to CT, and the least favourable influence on the retention properties was exerted by DD.

13

Effect of solid phase wettability on water transport and retention in peat enriched soil affected by freezing-thawing

75%

Hajnos M., Bowanko G., Jozefaciuk G., Glowacki R.

International Agrophysics

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2002

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tom 16

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nr 2

14

Influence of applying compost from municipal wastes on some physical properties of the soil

75%

Jamroz E., Drozd J.

International Agrophysics

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1999

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tom 13

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nr 2

15

Hysteresis between wetting and drying processes as affected by soil aggregate size

75%

Witkowska-Walczak B.

International Agrophysics

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2006

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tom 20

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nr 4

16

The influence of dewatering and reclamation on water retention of peat soils in the sandy outwash landscape

75%

Piascik H., Lachacz A.

Polish Journal of Soil Science

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1997

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tom 30

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nr 2

17

Comparison of correlation models for the estimation of the water retention characteristics of soil

75%

Walczak R., Witkowska-Walczak B., Slawinski C.

International Agrophysics

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2002

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tom 16

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nr 1

18

Effect of uniaxial compression on water retention, hydraulic conductivity and the penetration resistance of six Greek soils

75%

Panayiotopoulos K. P., Salonikiou E., Siaga K., Germanopoulou V., Skaperda S.

International Agrophysics

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2003

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tom 17

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nr 4

19

Effect of liquid polarity on refining process

63%

Kucner M., Przybysz P., Dubowik M., Buzala K.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2013

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tom 83

20

Przewodnosc hydrauliczna osrodka porowatego w ujeciu statystycznym

63%

Usowicz B.

Acta Agrophysica

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2001

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tom 53

177-187

Ograniczanie wyników

Determination of water retention characteristics of organic soils, using the indirect filter-paper method

Changes in runoff as an indicative measure of water retention status in the Bialowieza Primeval Forest

Water retention time in intermittently dosed sand filters