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研究论文

摘要：用酸定量回漓和土壤BS-pH缓冲曲线定性比较浙江省四种类型土壤酸缓冲性能的强弱.结果表明,酸性淋溶土缓冲能力虽较弱,但缓冲区出现范围较宽（BS20—80％）且缓冲性能较持久.近中性水成土则大体相反.四种土壤对SO₄^2-的吸附容量甚大,吸附过程符合Freundlich方程表述的规律.水和1.0 mol/L KNO₃对土壤吸附态SO₄^2-解吸率甚低（<40％）.

Abstract：The acidic buffering capacities and adsorption/desorption characteristics for sulfate anion of four soil groups were investigated. The results showed that the buffering capacities of aluminum-rich acidic soils （red and yellow-red soil） were weaker than that of nearly neutral hydromorphic soils （paddy and hydrofluvent soil）, while the former’ s buffering duration were longer than that of the latter’s. At the same concentration of SO₄²-in sorption-equilibrated solution, the amounts of SO₄²- adsorbed by acidic soils were much larger than that adsorbed by nearly neutral soils. The Freundlich isotherm equation could fit the adsorption data closely. The desorption rate of water or 1.0mo/L KNO3 was very low （40%） and the desorption capability of KNO3 to adsorbed SO₄²- of acidic soils was weaker than that of nearly neutral soils, indicating that acidic soil held and fixed SO₄²- more firmly.