关键词: 恩施州, 硒, 富集系数, 土壤, 药用植物, 资源调查

Abstract: In order to utilize the selenium ( Se)-enriched soils and medicinal plants and promote the development of Se-enriched medicinal products in Enshi Tujia and Miao Autonomous Prefecture(hereafter it will be abbreviated as Enshi Autonomous Prefecture).An investigation was conducted to test the Se concentration of soils(187 samples) and medicinal plants (243 samples) from twelve sampling sites in Enshi Autonomous Prefecture, and an experiment was conducted to learn the effects of foliar Se application on the growth of three medicinal plants(Gynostemma pentaphyllum,Atractylodes macrocephala and Codonopsis tangshen)from 2016—2018.The results showed that the soil Se content of 83.3% of the twelve investigated sampling sites met the standard of high level (Se>0.4 mg/kg),and the Se content of soil from Yutangba (Xintang Township,Enshi) reached extremely high level (Se>3 mg/kg).The plant Se content of 23.8% of the 168 investigated medicinal plants met the standard of Se-enriched agricultural products (Se≥0.2 mg/kg),among which Cardamine violifolia was superior in accumulation of Se with Se content of 311.00 mg/ kg and Se accumulation coefficient (SAC) of 76.60.There were differences in SACs among different species of medicinal plants which were cultivated in the same sampling site,and the same medicinal plants cultivated in different sampling sites also had different SACs.It was an effective way to produce Se-enriched medicinal products through cultivating medicinal plants in typical seleniferous region or spraying Se on plant leaves in Se deficient region. In conclusion, there were numerous Seenriched soils and medicinal plants in Enshi Autonomous Prefecture,and cultivating medicinal plants in typical seleniferous region or spraying Se on plant leaves in Se deficient region could be beneficial for the development of safe Se-enriched medicinal products in Enshi Autonomous Prefecture.

Key words: Enshi Autonomous Prefecture, Selenium, Accumulation coefficient, Soil, Medicinal plants, Resources investigation