【摘要】 【目的】明确荒漠草原地区药用植物适生土壤环境及生长发育过程对土壤结构的影响。【方法】以荒漠草原地区苦豆子、牛心朴子、香青兰生长土壤为研究对象,对土壤速效养分、pH值、土壤粒径分形维数进行分析。【结果】3种药用植物苦豆子、牛心朴子、香青兰生长土壤pH值为9.11～10.35,碱解氮含量分别为5.13、2.37、7.10 mg/kg,速效磷含量分别为3.05、6.74、3.13 mg/kg,速效钾含量分别为114.52、117.48、181.69 mg/kg;砂粒含量分别为83.41%、87.29%、84.77%。各药用植物生长土壤粒径曲线均为双峰型,牛心朴子生长土壤在1 000μm处具有最高值。0～10 cm土层牛心朴子生长土壤均匀度较好,10～20、20～30 cm土层香青兰生长土壤均匀度较好。【结论】苦豆子、牛心朴子、香青兰适宜生长于碱性土壤环境,土壤质地为砂土,土壤速效钾含量较高,其他速效养分含量低于适宜水平。牛心朴子生长土壤颗粒粗大,土壤颗粒有粗粒化的趋势,存在沙化的威胁。更多还原

【Abstract】 【Objective】To clarify the influence of suitable soil environment and growth process of medicinal plants on soil structure in desert steppe area.【Methods】Taking the growing soil of Sophora alopecuroides L.,Manchurian hancock(Maxim.)Al. and Dracocephalum moldavica L. as the research object in the desert steppe area,the soil available nutrients,pH,soil particle size and fractal dimensions and their correlation were analyzed. 【Results】The pH of the growing soil of the three medicinal plants Sophora alopecuroides L.,Manchurian hancock(Maxim.)Al. and Dracocephalum moldavica L. was9.11-10.35,the content of alkali hydrolyzed nitrogen was 5.13,2.37,7.10 mg/kg,the content of available phosphorus was3.05,6.74,3.13 mg/kg, and the content of available potassium was 114.52,117.48,181.69 mg/kg;sand content was 83.41%,87.29%,84.77%,respectively. The growth soil particle size curve of various medicinal plants were bimodal,and the growth soil of Manchurian hancock(Maxim.)Al. had the highest value at 1 000 μm. The 0-10 cm soil layer had better soil uniformity for the growth of Manchurian hancock(Maxim.)Al. and the soil uniformity for the growth of Dracocephalum moldavica L. 10-20 cm and 20-30 cm soil layer was better.【Conclusion】Sophora alopecuroides L.,Manchurian hancock(Maxim.)Al.,and Dracocephalum moldavica L. are suitable for growth in alkaline soil environment,sandy soil, higher soil available potassium content,and the content of other available nutrients is lower than the appropriate level. Manchurian hancock(Maxim.)Al. grows with coarse soil particles. The soil particles has a tendency of coarsening and there is a threat of further desertification.更多还原