不同类型土壤对SO_4^（2－）吸附特性的研究

Characterization of the Adsorption of Sulfates onto Different Types of Soil

为了进一步探讨我国酸沉降对水陆生态环境的影响以及典型地区生态系统对酸沉降的缓冲能力和临界负荷值，笔者对赣、鄂、湘３省具有代表性的土壤的ＳＯ吸附特性进行了研究。结果表明，红壤，待别是江西省的红壤，吸附ＳＯ的能力最强，最大吸附量达１１．５２ｍｇ／ｇ士；其余依次为黄壤、棕红壤、黄褐壤和黄红壤，最大吸附量分别为１１．１４，８．８３，６．８６和６．５３ｍｇ／ｇ土；红色石灰壤对ＳＯ的吸附能力最弱，最大吸附量仅３．５５ｍｇ／ｇ土，只及红壤的３０．８％。可以预计，就地区而言，以红壤为主的江西省是我国对酿沉降最敏感的地区之一。

The characteristics of sulfates adsorption onto the representative types of soil in the three provinces of Jiangxi, Hubei and Hunan were studied in order to further understand the effects of acid deposition on aquatic ecosystems in China, and the capacity of ecosystems in typical areas to buffer an acid deposition and their values of critical loading. The results show that the red soil, particularly from Jiangxi Province, has the strongest capacity of adsorbing sulfates with a maximum adsorption capacity of 11.52 mg/g, and others in an order of decreasing maximum adsorption capacity are yellow soil of 11.14 mg/g, brown-red soil of 8.83mg/g, yellow-brown soil of 6. 86 mg/g, yellow-red soil of 6. 53 mg/g, and red-lime soil of 3. 55 mg/g which is only 30% of that for red soil and the weakest one. It is expected that Jiangxi Province where red soil is dominately distributed would be one of the areas which are most sensitive to acid deposition in this country.