Počet záznamů: 1

Profile distribution of humic substances molecular fractions in mountain spruce forest soil

  1. 1.
    0368843 - BC-A 2012 RIV SK eng J - Článek v odborném periodiku
    Šestauberová, Martina - Novák, František
    Profile distribution of humic substances molecular fractions in mountain spruce forest soil.
    Phytopedon. Roč. 10, č. 1 (2011), s. 60-65 ISSN 1336-1120
    Výzkumný záměr: CEZ:AV0Z60660521
    Klíčová slova: forest soil * fulvic acids * humic acids
    Kód oboru RIV: EH - Ekologie - společenstva

    The objective of this study was to describe changes in molecular weight of humic (HA) and fulvic acids (FA) with depth of soil profile, and to state their mobility in a soil environment. Samples were isolated from individual podzol horizons of spruce forest in Trojmezí stand (Bohemian Forest, 48°46'25" N, 13°51'04" E). Their molecular weight Mr and weight-average molecular weight Mw were determined by the low pressure size exclusion chromatography. For the high-molecular HA fraction (HM-HA), Mr values over 250 kDa were found, while values of FA and the main HA fraction ranged between 6.4-7.6 kDa and 6.7-31.4 kDa, respectively. The Mr of humic substances and the proportion of HM-HA decreased with increasing soil depth. HA isolated from horizon Bhs didn't contain any high-molecular fraction and its molecular weight approached the values specified for FA.
    Trvalý link: http://hdl.handle.net/11104/0203069