Podrobnosti záznamu

Název
    Impact of diffuse agricultural pollution sources on groundwater quality in the Czech Republic
Údaj o odpovědnosti
    Vladimír Pěkný, Irena Skořepová
Další názvy
    Les eaux souterraines et l'hydrogéologie en République tcheque (Variant.)
    Impact des pollutions diffuses agricoles sur les eaux souterraines en République tcheque
Autor
    Pěkný, Vladimír
    Skořepová, Irena
Jazyk
    anglicky
Zdrojový dokument - seriál
    Hydrogéologie
Svazek/č.
    No. 2
Strany
    p. 71-77
Rok
    1999
Poznámky
    4 obr., 5 tab., 5 bibl.
    Francouzské resumé
    Zkr. název ser.: Hydrogéologie
Předmětová skupina
    dusík
    půdy
    uhlík
    voda kontaminovaná
    voda podzemní
    vodní hospodářství
    zemědělství
Geografické jméno
    ČR-Čechy
    Káraný (Praha-východ)
    Nová Ves (Kutná Hora)
    Samšín (Pelhřimov)
Klíčové slovo
    Agricultural
    Czech
    Diffuse
    Groundwater
    Impact
    Pollution
    Quality
    Republic
    Sources
Abstrakt (anglicky)
   Diffuse nitrate pollution of groundwater has been recognised as one of the most serious impacts of farming activities on the groundwater system. Nitrate concentrations in groundwater sampled from boreholes of the water supply system of a typical catchwork area in the Czech Republic have increased from<10 mg.l-1 NO3- in 1920, to 15-30 mg.l-1 NO3 in 1966 and 20-65 mg.l-1 NO3- in 1989. After 1989, when doses of nitrogen fertilizers were rapidly reduced, a decline in nitrate content was observed up until 1993, but this trend has not continued. Nitrogen from fertilizer constitutes only a small part of the total amount of nitrogen found in soil. Substantial amounts of nitrogen are bound to sil organic matter, and disturbances that destabilize this matter can result in a decreased intensity of biochemical processes and lead to increased losses of nitrogen compounds from the soil system to the hydrogeological system.
   This study examines the mass balance transport and transformation of nitrogen compounds in the soil-groundwater system at the two experimental sites of Nova Ves near Kutna Hora in central Bohemia and Samsin near Pelhrimov in southern Bohemia. Using two different regimes of inorganic fertilizer application on the experimental plots, a parabolic relationship was identified between fertilizer dose and the nitrate concentration in groundwater - the latter increased up to a certain rate of fertilizer application and then decreased at higher rates. Under the conditions pertaining at the experimental sites, this threshold value was approximately 100 kgN.ha-1y-1. Above this threshold, nitrate content decreased due, to an inhibition of soil microflora activity, and thus a reduced mobilization of nitrogenous organic compounds. The study also focused on nitrate transport resulting from disturbed soil organic matter dynamics and its relationship to increases in groundwater nitrate concentrations.
   Microbiological tests helped to identify a long-term increase in the proportion of unstable nitrogenous organic compounds
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    25. 3. 2008
Datum importu
    8. 8. 2012