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Assessment of critical loads in Liuzhou, China using static and dynamic models

, : Assessment of critical loads in Liuzhou, China using static and dynamic models. Water Air & Soil Pollution 85(4): 2401-2406

The project Comprehensive Control and Demonstration for Acid Deposition in Liuzhou area is a national key project in the 8th Five-year plan, and the study on critical loads will provide scientific and quantitative accordance for formulating control strategy. In this paper, critical loads of acid deposition to soil in Liuzhou area, China, were calculated using the Steady State Mass Balance method (SMB and PROFILE) and dynamic modeling methods (MAGIC), based on data obtained from field investigations and physiochemical properties measured through experiments such as the organic content, cation exchange capacity, base saturation, sulfate adsorption capacity, gibbsite coefficient, biomass base cation uptake and selectivity coefficient for cations. Weathering rates necessary to calculate soil chemistry in applying SMB and MAGIC model were determined by computation with PROFILE using independent geophysical properties such as soil texture and mineralogy as the input data, or by the total soil base cation content correlation. The results have shown that the critical loads of acidity in this areas are in the range of 0.7-6.0 keq ha-1 yr-1, indicating sulfur deposition should be cut down by 50-90 percent of the present level. The upper soil layer is the most sensitive. The maximum allowable deposition loading of this area is also presented in the paper.


DOI: 10.1007/bf01186193

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