应用HPLC法研究了内蒙草麻黄主产区5种麻黄生物碱的动态变化。5种麻黄生物碱为:麻黄碱(E)、伪麻黄碱(PE)、去甲基麻黄碱(NE)、去甲基伪麻黄碱(NPE)和甲基麻黄碱(ME)。研究结果表明:内蒙东部的草麻黄生长期中E占优势,而在西部PE和E平行或PE高于E,总生物碱在7月中旬和9～10月达高峰。因此影响含量的主要因素是物侯期、降雨量和湿度。对地理位置、气象情况和退化现象等因素也进行了讨论。 The dynamic changes of five kinds of ephedra alkaloids in the main producing areas of Inner Mongolia, Mongolia, China were studied by HPLC. The five ephedra alkaloids were ephedrine (E), pseudoephedrine (PE), desmethylephedrine (NE), desmethylephedrine (NPE), and methylephedrine (ME). The results showed that E in the growth stage of E. sinensis in the eastern part of Inner Mongolia predominated, whereas in the western part PE and E were parallel or PE was higher than E, and the total alkaloid peaked in the middle of July and September to October. Therefore, the main factors affecting the content are the property period, rainfall, and humidity. Geographical, meteorological, and degradation phenomena were also discussed.