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Open access

Michał Kozłowski and Jolanta Komisarek

Abstract

The objective of this study was to examine whether the Polish soil textural classification is useful for evaluation of soil water retention and hydraulic properties and, furthermore, for determining which textural classes are characterized by the highest diversity of soil water retention and hydraulic properties. The texture triangle was divided into a 1% grid of particle-size classes resulting in 5151 different data points. For each data point, soil water retention parameters and saturated hydraulic conductivity were obtained using the ROSETTA program. The silt classes showed the highest uncertainty in the estimation of the saturated water content based on the soil texture. These classes are characterized by high variations of saturated water content within the class. Estimations of field capacity and permanent wilting point on the basis of textural classes are encumbered with highest errors for gp, pg, pl and pyg soils, which are characterized by the highest values of coefficient of variation. Saturated soil hydraulic conductivity is better classified into homogeneous classes by the Polish texture classes than by the clusters obtained by the k-means cluster analysis based on the soil hydraulic and retention properties. Soil water retention parameters are better classified into homogeneous groups by the k-means cluster analysis than by the traditional textural classes. Cluster analysis using the k-means can be helpful for grouping similar soils from the point of view of their retention properties.

Open access

Michał Kozłowski and Jolanta Komisarek

Abstract

The investigation was carried out in the catena of Retisols within the Opalenica Plain. The aim of the study was to characterize the variation in texture of selected Retisols formed from ground moraine glacial till of Leszno Phase of Vistulian glaciation. The analyzed soils are characterized by a similar degree of soil material segregation, which is characteristic for the typical glacial till. Particle size distribution and granulometric indices lead to conclusion that soils located in the catena on summit and shoulder positions, have vertical texture distribution formed primarily by lessivage process. Sandy texture of eluvial horizons noted in the Retisol of the slope pediment can be a consequence of not only lessivage but also of slope forming processes that led to the appearance of lithic discontinuity. The cluster analysis using Ward’s method and 1-rPearson as the distance measure can be helpful for identification the lithogenic uniformity and/or non-uniformity of soil parent material.

Open access

Michał Kozłowski and Jolanta Komisarek

Abstract

The paper presents results of determination of temporal changes in water table depths in the toposequence of Retisols/Luvisols and Phaeozems/Gleysols. Assessment of temporal trends in the water table depth was made with the use of the linear regression analysis. The results obtained indicate that the mean water table depth and mean high and low water table depths were deeper in the soil at the upper part of the slope in comparison with soil located at the footslope. A higher amplitude of water table was observed in Retisols than in Gleysols but the highest variability of water table level was noted in the soils at the footslope compared to those at the slope summit. In Retisols, with each month of observation from 1993 to 2012, the water table showed a tendency to increase. These trends were the highest from January to April, which may be related to the tendency of increasing monthly sums of precipitation in December, January and February. In the Gleysol at the footslope, in the period 1993–2012 and in the vegetation season, the water table depth showed a tendency to decrease. This trend may be due to the impact of water table on the soil water content at the root zone, which is used in the process of evapotranspiration.

Open access

Jerzy Marcinek, Jolanta Komisarek, Andrzej Mocek, Renata Bednarek and Stefan Skiba

Streszczenie

W pracy przedstawiono sprostowania nieścisłości, jakie znalazły się w artykule Stanisława Brożka pt. „Czy sys- tematyka gleb Polski, wydanie 5. dotyczy wszystkich gleb naszego kraju" opublikowanym w Rocznikach Gleboznawczych vol. 63, nr 3, 2012: 49-56. Praca ta jednak nie jest artykułem dyskusyjnym, lecz zbiorem uwag, najczęściej nieprofesjonalnych, na temat „Systematy ki gleb Polski” wyd. 5, 2011 (SgP5). Ponieważ w arty kule ty m znalazło się wiele błędów i nieścisłości wynikają- cych z niezrozumienia przez Autora istoty systematy ki gleb, a także tekstu ocenianej ..Systematyki...’', dlatego w niniejszym opraco- waniu nie podjęto szerszej dyskusji merytorycznej, jedynie przedstawiono sprostowania do błędnych wypowiedzi Autora, które dotyczą SgP5. Tym bardziej jest to konieczne, że Autor nie jest specjalistą z zakresu systematyki gleb, a Jego artykuł został opubli- kowany w gleboznawczym czasopiśmie naukowym.