几种土壤交换性酸测定方法的效果比较  

Comparison of Soil Exchangeable Acidities by Different Measured Methods

作　　者：李忠意[1] 白颖艳 程永毅[1] 李艳[1] 杨剑虹[1] 

机构地区：[1]西南大学资源环境学院,重庆400716

出　　处：《土壤》2017年第6期1210-1215,共6页Soils

基　　金：重庆市博后资助项目(Xm2016076);中央高校基本业务专项资金(XDJK2016C191)资助

摘　　要：为真实地反映酸性土壤交换性酸含量水平,探讨了KCl淋溶法、BaCl_2淋溶法、NaAc淋溶法、KCl-三乙醇胺(Triethanolamine,TEA)提取法和BaCl_2-TEA提取法对紫色土、黄壤、红壤和砖红壤4种土壤的交换性酸测定效果。结果表明:5种方法测得的土壤交换性酸大小关系为:BaCl_2-TEA提取法>KCl-TEA提取法>NaAc淋溶法>BaCl_2淋溶法>KCl淋溶法。BaCl_2淋溶法能较为真实地反映出土壤交换性酸水平,其次为KCl淋溶法。受土壤有机酸和铝氧化物的影响,NaAc淋溶法、KCl-TEA提取法和BaCl_2-TEA提取法测得的土壤交换性酸含量偏高。但由于尚无标准方法对测定结果进行验证,因此,还需进一步对土壤交换性酸测定方法及其影响因素开展研究。The contents soil exchangeable acidity of purplish soil, yellow earth, red earth and latosol were measured respectively by the methods of KCl leaching, BaCl2 leaching, NaAc leaching, KCl-TEA （Triethanolamine） extraction and BaClE-TEA extraction in order to accurately measure the content of soil exchangeable acidity in acidified soil. The results showed that the measured content of soil exchangeable acidity followed the order of BaClE-TEA extraction 〉 KCl-TEA extraction 〉 NaAc leaching 〉 BaCl2 leaching 〉 KCl leaching. Among the five measurement methods, the methods of BaCl2 leaching and KCl leaching are the two novel methods which could be used to measure more accurately the content of soil exchangeable acidity of acidified soil. Comparatively, the contents of soil exchangeable acidity measured by BaCl2-TEA extraction, KCl-TEA extraction and NaAc leaching were a bit higher due to the influence of soil organic acids and Al oxides, however, further studies should be conducted on the measurement of soil exchangeable acidity and its influential factors because of the lack of standard method to verify the current experimental results.

关 键 词：交换性酸 BaCl2淋溶法 有效阳离子交换量 

分 类 号：S153.4[农业科学—土壤学]