Acidic deposition and its effects in southwestern China |
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Authors: | Hans M. Skip Zhao Dianwu Xiong Tiling Zhao Dawei Thorjørn Larssen Liao Bohan Rolf D. Vogt |
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Affiliation: | 1. Dept. of Chemistry, University of Oslo, Blindem, P.O. Box 1033, 0315, Oslo, Norway 2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing, China 3. Guizhou Inst. of Environmental Sciences, 148 Xinhua Road, Guiyang, China 4. Chongqing Inst. of Environmental Science and Monitoring, 37 Jia Ling VLG-1, Jiang Bei District, Chongqing, China
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Abstract: | The emissions of SO2 in China correspond at present to 8–10 TgSyr?1. The rapid industrialization has caused a dramatic increase in the emissions in recent years and this increase is likely to continue. This paper describes studies of concentrations and effects of acidifying substances in parts of the Guizhou and the Sichuan provinces where the S-emissions are large. A small catchment about 10 km from Guiyang centre was equipped with instruments for studies of soils, soil water and streamwater chemistry. The molar ratio Al/(Ca+Mg) is > 0.8 in soil water in some places. Two small streams have median pH-values about 4.6 and 5.1. Laboratory studies with selected Chinese soils showed that the anion adsorption was low. These studies gave also important information on soil sensitivity. The studies confirm that acid deposition may affect soils in parts of south-western China, but the sensitivity varies dramatically and there is a strong need for more information. |
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