Podrobnosti záznamu

    Catchment-Scale Acidification Reversal Experiment at Gardsjön, South-west Sweden - Assessment of the Experimental Design
Údaj o odpovědnosti
    Filip Moldan, B. Ingvar Andersson, Kevin H. Bishop, Hans Hultberg
    Andersson, B. Ingvar
    Bishop, Kevin H.
    Hultberg, Hans
    Moldan, Filip
Zdrojový dokument - monografie
    Experimental reversal of Acid Rain Effects: The Gardsjön Roof Project
    s. 84-108
    7 obr., 1 fot., 1 tab., 2 s.bibl.
Předmětová skupina
    kyselý déšť
    malé povodí
    studie experimentální
Geografické jméno
Klíčové slovo
Abstrakt (anglicky)
   At the Gardsjön Covered Catchment Experiment, atmospheric deposition is almost entirely excluded from the forested headwater catchment G1 ROOF by means of a plastic roof that prevents precipitation from reaching the ground. In the first 4 years of the treatment, 2960 mm of artifial precipitation was applied (18 600 m3) over the course of 339 sprinklings. The throughfall input of sulphate to the catchment was reduced by the treatment from 128 meq/m2/yr to 25 meq/m2/yr. The input of nitrate declined from 63 meq/m4 meq/m2/yr and ammonium (31 meq/m2/yr before the roof) was excluded entirely. This deposition regime is designed to simulate a major reduction in acid deposition. There are many advantages to such catchment manipulations, but given the technical difficulties of controlling as many experimental variables as this project entails, it is important to evaluate the extent to which the catchment manipulation simulates the deposition reduction intended.
   In this paper we assess the extent to which this artificial regime simulates the reduction of acid deposition that would occur if atmospheric emissions were reduced to pre-industrial levels. The change of atmospheric input was accomplished as planned without causing major changes in microclimate or hydrological regime. Several compromises, however, were necessary. Sprinkling solution does not represent pre-industrial throughfall ideally and several other aspects were altered as well, such as the spatial-temporal dynamics of water input and internal cycling of forest nutrients. We believe these inevitable compromises generally tend to slow the rate of recovery which would have been induced by removal of all anthropogenic deposition to this gravely acidified forest ecosystem. None of these deviations from an ideal manipulation, however, to the significantly diminishes the capacity of the experimental results to contribute to the understanding of acidification recovery.
   Nevertheless, careful consideration must be given to these compromises, particularly with regard to the alt
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
Datum vložení
    18. 2. 2008
Datum importu
    8. 8. 2012