Podrobnosti záznamu

Název
    Temporal variability of structure and hydraulic properties of topsoil of three soil types
Autor
    Jirků, V.
    Kodešová, R.
    Mühlhanselová, M.
    Nikodem, A.
    Žigová, Anna
Jazyk
    anglicky
Typ dokumentu
    článek v odborném periodiku
Zdrojový dokument - seriál
    Geoderma
Svazek/č.
    204/205, August
Strany
    s. 43-58
Rok
    2013
Poznámky
    Projekt: GA526/08/0434, GA ČR3cav_un_auth*0241613
    Rozsah: 16 s. : E
Předmětová kategorie
    aggragate stability
    hydraulic conductivity
    seasonal and annual variability
    soil micromorphology
    soil-water retention curve
Klíčové slovo
    Hydraulic
    Properties
    Soil
    Structure
    Temporal
    Three
    Topsoil
    Types
    Variability
Abstrakt (anglicky)
   The soil structure and hydraulic properties of arable soils considerably vary during the year due to the periodical tillage, fertilization, plant and root grow, climate impact etc. The knowledge of these soil properties is essential when assessing water regime and associated dissolved substance transport in soils. Temporal variability of soil properties measured in surface horizons of three soil types (Haplic Cambisol, Greyic Phaeozem, Haplic Luvisol) was studied in years from 2007 to 2010. Undisturbed soil samples were taken every month to evaluate the actual field soil-water content, bulk density, porosity and hydraulic properties. The grab soil samples were taken every month to evaluate aggregate stability using the water stable aggregates index, pHH2O and pHKCl, soil organic matter content and quality. Unsaturated hydraulic conductivity for pressure head of −2 cm was measured directly in the field using the minidisk tension infiltrometer.
   In addition soil structure was documented on micromorphological images. In some cases, the similar seasonal trends of the soil pHH2O, pHKCl, organic matter quality, bulk density, porosity or aggregate stability were observed in different soils. The soil structure, aggregate stability and soil hydraulic properties were interrelated and depended on plant growth, rainfall and tillage. The drier conditions in some soils positively influenced the soil aggregate stability, slope of the retention curve at the inflection point and hydraulic conductivity. Probably due to the high variation of soil hydraulic properties no closer correlation between them and other properties was detected. The slope of the retention curve at the inflection point (e.g. indicator of soil physical quality) in many cases increased (decreased) when also the soil aggregate stability and hydraulic conductivity values increased (decreased).
   No closer correlation was revealed when analyzing these relationships for the entire observation period.
Přispěvatel
    AV ČR Brno, Geologický ústav
Kód přispěvatele
    AV ČR, GLÚ
Zdrojový formát
    U
Datum importu
    23. 10. 2014