石锦芹　丁瑞兴　刘友兆　孙玉华摘要　用亚热带茶区的4种未垦荒地土壤作土柱模拟，研究了重施尿素和表覆茶树落叶对土壤酸化的影响。结果表明，尿素和茶树落叶处理都能酸化土壤，尤以0～20 cm的表层最为明显，其中又以赤红壤和黄壤的酸化比红壤和黄棕壤明显。文中还对尿素和茶树落叶对茶园土壤的酸化作用、酸化过程和不同土类的酸化差异进行了讨论。关键词：茶园土壤　酸化　尿素　茶树落叶中图分类号：S571.1 S153.4

文献标识码：A Acidification of Soil by Urea and Fallen Tea Leaves Shi Jinqin，Ding Ruixing，Liu Youzhao，Sun YuhuaNanjing Agricultural University，Nanjing　210095 Abstract Four uncropped soils in subtropical tea producing area were applied in soil column experiments to study the influence of urea and fallen tea leaves on soil acidification．Both urea and fallen tea leaves acidified the soils．Soil acidification most seriously occurred in topsoil．Lateritic red soil and yellow so