Gyöngyi Barna

Particle-size and organic matter effects on structure and water retention of soils

Abstract Water storage and flow in soils are highly dependent on soil structure, which strongly determines soil porosity. However pore size distribution can be derived from soil water retention curve (SWRC). Structural characteristics of cultivated arable fields (693 soil profiles, 1773 samples) and soils covered by treated forest stands (137 soil profiles, 405 samples) were selected from the MARTHA Hungarian soil physical database, and evaluated for expressing organic matter effects on soil structure and water retention. For this purpose the normalized pore size distribution curves were determined for the selected soils, plus the modal suction (MS) corresponding to the most frequent pore size class of the soil. Skewness of soils’ pore size distribution curves are found different. The quasi-normal distribution of sandy soils are transformed into distorted in clayey soils. A general growing trend of MS with the ever finer soil texture was shown. Sandy soils have the lowest average MS values, i.e. the highest most frequent equivalent pore diameter. Silty clay and clay soil textures are characterized by the highest MS values. A slight effect of land use and organic matter content is also observable in different MS values of soils under forest vegetation (’forest’) and cultivated arable land (‘plough fields’). MS values of the two land uses were compared statistically. The results of the analyses show that certain soil group’s MS are significantly different under forest vegetation and cultivation. However this difference can be explained only partly and indirectly by the organic matter of different plant coverage in the land use types.

Nature Iraq (2017). Key biodiversity areas of Iraq: Priority sites for conservation and protection: Edited by Anna Bachmann, Azzam Alwash, and Ali Lami. Published by Tablet House Publishing, Huntington Beach CA. Hard cover edition, ISBN 978-0-9886514-6-3. USD 96.

The book contains 29 pages of introductory chapters and 297 pages of technical description in 7 chapters written by 10 authors. There are 24 tables, 8 figures, 21 plates of photographs, 24 maps, al...

Soil salinity management in agriculture: Technological advances and applications (Innovations in biological engineering),: edited by S. K. Gupta and Megh R. Goyal,Waretown, NJ: Apple Academic Press, 2017, 454 pp.,

The book is written by 28 authors on 454 pages, in 12 technical chapters. The book shows the state-of-the-art of salinity management, mainly in India.The book consists of a long introductory part w...

159.95 (hardcover),

The particle size distribution (PSD) values obtained for a soil database representing the main Hungarian soil types using the Hungarian standard (MSZ-08-0205-78) and the international standard (ISO/DIS 11277:1994) were compared with the pipette method. The relationship between these PSDs and other physical soil characteristics (upper limit of plasticity according to Arany, water vapour adsorption according to Sik) was also analysed, and a suggestion was made of how these results could be converted into each other. Experience showed that the pre-treatments applied as part of the ISO/DIS method may change the ratio of particle size fractions: there was a significant increase in the clay content, while the silt content decreased to a lesser and the sand content to a greater extent, possibly because some of the particles remain in microaggregate form when the MSZ method is used. The results confirmed the greater accuracy of the ISO/DIS method: the clay contents measured with the ISO/DIS method exhibited stron...

134.87 (Kindle version). ISBN 978-1-77188-443-3 and 978-1-315-36599-2.

Modelling the flow and transport of fluids (water and non-aqueous phase liquids or NAPLs) in porous systems or soils requires the accurate and reliable determination of basic input modelling parameters, such as liquid retention (Pc–S) and conductivity (Ksat, Kh). Methods for the determination (measurement and estimation) of water retention and conductivity have improved enormously over the last 60 years (Table 1). Promising results verified the applicability of pedotransfer functions (PTF) and their incorporated versions into software and submodels. However, the development of models was only aimed at improving methods with which these hydrological parameters could be determined for water, while calculations for NAPLs can still only be made indirectly. Several studies (e.g. in the petroleum industry, and research for environmental or hydrological purposes) revealed differences in the relationship between the hydraulic properties and pore system of the porous solid phase. Interactions (swelling-shrinking, ...

A talajok mechanikai összetétel vizsgálata pipettás ülepítéses módszerrel: a hazai és a nemzetközi szabvány szerinti eljárások összehasonlítása és konverziója

A lezerdiffrakcios szemcseanalizis egy korszerű modszer a talajmechanikai vizsgalatokban, am egy egyseges meresi szabvany bevezetese (akar műszerhez kothetően) nagymertekben novelne a meresek reprodukalhatosagat. A meresek tekinteteben kiemelt szerepe van az előkeszitő modszereknek (talajszerkezetet kialakito kotőanyagok roncsolasa, elemi szemcsek diszpergalasa), azonban ezen a teren is hianyzik az egyseges szabvanyositas. A tanulmanyozott kozlemenyek alapjan megallapithato, hogy mind az optimalis mintaelőkeszitesi modszer, mind pedig a legmegfelelőbb műszerbeallitas nagymertekben fugg a merni kivant minta fizikai es kemiai sajatsagaitol. A meresi eredmenyek hagyomanyos ulepiteses modszerrel kapott eredmenyekkel tortenő osszehasonlitasara szolgalo konverzios modszerek (frakcio merethatarvaltasok, illetve konverzios egyenletek) hasznalhatosaga is talajminta- es LDM vizsgalati modszer-fuggő. A lezeres szemcseanalizis alkalmazasa a talajok aggregatum-stabilitas vizsgalata soran igeretes modszertani lehetőseg...

Folyadék-visszatartás, folyadékvezetés és porozitás összefüggései vízzel és/vagy szerves folyadékkal telített talajokban I. Folyadék-visszatartó képesség — Szemle

Kationos feluletaktiv anyag, a hexadecilpiridinium-klorid (CPC) adszorpciojat vizsgaltuk kulonboző talajokon, uledekeken es asvanyi őrlemenyeken. Valodi talajokon tortenő adszorbealodasarol keves i...