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首页> 美国政府科技报告 >Sulfate Stores and Sulfate Adsorption Capacity of the Spodic B Horizon of Swedish Forest Soils
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Sulfate Stores and Sulfate Adsorption Capacity of the Spodic B Horizon of Swedish Forest Soils

机译：瑞典森林土壤spodic B层的硫酸盐储存和硫酸盐吸附能力

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Soil materials, collected from the spodic horizon of 31 forest sites across Sweden were examined for their content of phosphate-extractable sulfate as well as for the capacity for adsorbing added (35)S-labelled sulfate. It was found that the mean content of extractable SO(4)(2-)-S in the uppermost 0-10 cm layer of the spodic horizon amounted to 54 mu g/g with a variation range between -1 and 293 mu g/g. The highest SO4(2-)-store registered in the spodic horizon examined amounted to 484 kg S/ha. The extractable sulfate contents were most closely related to the oxalate-, formate- and acetate-extractable Al. The relationship with pH (H2O) and organic C content of the soil was non-significant. With a few exceptions the soils indicated a capacity for additional adsorption of sulfate added as (35)S-labelled SO4(2-). The mean adsorption capacity was 42 mu g/g. The above figure for adsorption capacity increased to 97 mu g SO4(2-)S/g when the pH of the soil-water suspension was lowered to 3.-3.7. The data presented did not indicate any simple relationships between the soil content of extractable sulfate and the amounts of atmospheric deposition of sulfur on the experimental sites in question.

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