HouleCarignan1995

Référence

Houle, D. and Carignan, R. (1995) Role of SO4 adsorption and desorption in the long-term S budget of a coniferous catchment on the Canadian Shield. Biogeochemistry, 28(3):161-182. (Scopus )

Résumé

The hypothesis that SO4 desorption can explain apparent long term net SO4-S losses (5 kg·ha-1·yr-1 on average) at the Lake Laflamme catchment from 1982 to 1991 is examined. Field observations show that SO4 concentrations in the soil solution are strongly buffered during percolation through the Bf horizon. In the Bf horizon, SO4 exchange reactions between the adsorbed and aqueous compartments are rapid (hours). Most (≈60%) of the adsorbed SO4 may be readily desorbed with deionized water. These observations and the presence of an important adsorbed SO4-S reservoir in the Bf horizon (113 kg·ha-1) as compared with annual wet SO4-S deposition (7 kg·ha-1), suggest that on the short-term, adsorption and desorption reactions can control dissolved SO4 concentration in the Bf horizon. To examine whether SO4 adsorption/desorption could explain long-term SO4-S losses by the catchment, an aggregated Langmuir isotherm for the Bf horizon was used to calculate the catchment's resilience to changing SO4-S loads. The results indicate that the soil should adjust rapidly (within 4 years) to changing SO4-S loads and that SO4 desorption alone cannot explain long-term net SO4-S losses. Other possibilities, such as an underestimation of dry deposition or the weathering of S-bearing minerals also appear unlikely. Our results suggest a net release of SO4-S from the soil organic S reservoirs (1230 kg·ha-1) present in the catchment. © 1995 Kluwer Academic Publishers.

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@ARTICLE { HouleCarignan1995,
    AUTHOR = { Houle, D. and Carignan, R. },
    TITLE = { Role of SO4 adsorption and desorption in the long-term S budget of a coniferous catchment on the Canadian Shield },
    JOURNAL = { Biogeochemistry },
    YEAR = { 1995 },
    VOLUME = { 28 },
    PAGES = { 161-182 },
    NUMBER = { 3 },
    NOTE = { cited By 27 },
    ABSTRACT = { The hypothesis that SO4 desorption can explain apparent long term net SO4-S losses (5 kg·ha-1·yr-1 on average) at the Lake Laflamme catchment from 1982 to 1991 is examined. Field observations show that SO4 concentrations in the soil solution are strongly buffered during percolation through the Bf horizon. In the Bf horizon, SO4 exchange reactions between the adsorbed and aqueous compartments are rapid (hours). Most (≈60%) of the adsorbed SO4 may be readily desorbed with deionized water. These observations and the presence of an important adsorbed SO4-S reservoir in the Bf horizon (113 kg·ha-1) as compared with annual wet SO4-S deposition (7 kg·ha-1), suggest that on the short-term, adsorption and desorption reactions can control dissolved SO4 concentration in the Bf horizon. To examine whether SO4 adsorption/desorption could explain long-term SO4-S losses by the catchment, an aggregated Langmuir isotherm for the Bf horizon was used to calculate the catchment's resilience to changing SO4-S loads. The results indicate that the soil should adjust rapidly (within 4 years) to changing SO4-S loads and that SO4 desorption alone cannot explain long-term net SO4-S losses. Other possibilities, such as an underestimation of dry deposition or the weathering of S-bearing minerals also appear unlikely. Our results suggest a net release of SO4-S from the soil organic S reservoirs (1230 kg·ha-1) present in the catchment. © 1995 Kluwer Academic Publishers. },
    AUTHOR_KEYWORDS = { catchment; forest soils; S budget; S mineralisation; SO4 adsorption/desorption; SO4 exchange kinetics; soil solution SO4 },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1007/BF02186457 },
    KEYWORDS = { adsorption; desorption; forest soil; kinetics; mineralization; sulphur budget, Canada, Canadian Shield, Lake Laflamme },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-0028994095&partnerID=40&md5=780b3b5b5f7ff66f0f021db925cf9d13 },
}

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