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目的 研究中药益母草的生物碱含量与其产地生态环境间的关系。方法 在5个不同地区采集益母草药材和土壤样品；通过资料查阅和实地调查，考察产地的生态环境；用高效液相色谱法测定药材中的生物碱含量。结果 不同地区的气候、土壤、植被等环境条件不同。各生长地的益母草基本上长势良好，但药材中生物碱含量差异很大。产于土壤为碱性的北方两个地区的药材中含量（约0.4%）比产于酸性土壤的南方地区的（0.1%~0.2%）要高。结论 与药材中生物碱含量相关的因素有生长地土壤中有机质、有效磷、速效钾的含量和土壤的pH值等，其中土壤的pH值是呈正相关的重要因素。北方的碱性土壤比南方的酸性土壤更有利于生物碱的积累。另外一些可能的影响因素是气候和遗传因素。
Objective To study the relationship between the alkaloid content of Leonurus chinensis and its ecological environment. Methods The motherwort herbs and soil samples were collected in 5 different areas. Through data review and field surveys, the ecological environment of the producing areas was examined; and the alkaloid content in medicinal materials was determined by HPLC. Results The climate, soil, vegetation, and other environmental conditions in different regions are different. The motherwort grows well in all areas, but the content of alkaloids in herbs is very different. The content of medicinal herbs (about 0.4%) in the two northern regions where the soil is alkaline is higher than that in the southern regions where the soil is acidic (0.1%~0.2%). Conclusion The factors related to the content of alkaloids in medicinal materials include the content of organic matter, available phosphorus, available potassium and the pH value of the soil in the soil in which the soil is grown. The pH of the soil is an important factor that is positively correlated. The alkaline soil in the north is more conducive to alkaloid accumulation than the acidic soil in the south. Other possible influencing factors are climate and genetic factors.