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| Effects of biogas slurry and AM fungi on growth and heavy metal accumulation of licorice plants |
| Received:January 24, 2016 |
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| KeyWord:licorice;biogas slurry;arbuscular mycorrhizal(AM) fungi;soil fertility |
| Author Name | Affiliation | E-mail | | HOU Shi-ji | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | LI Tao | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | LIN Ge | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | CHEN Bao-dong | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | bdchen@rcees.ac.cn |
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| Abstract: |
| Licorice(Glycyrrhiza uralensis Fisch) is a widely used Chinese medicinal herb. Due to irrational exploration of wild plants, intensive cultivation of licorice plants becomes a popular practice, and technological development for promoting plant growth and ensuring product safety becomes an urgent need. In the present study, a pot experiment was conducted to investigate the growth promoting effects of biogas slurry and arbuscular mycorrhizal(AM) fungi on licorice plants. Biogas slurry was applied at different dilution rates(biogas slurry/deionized water, v/v=10/0, 9/1, 5/5, 1/9, 0/10), while licorice plants were inoculated with/without AM fungus Rhizophagus intraradices at each biogas slurry application rate. The experimental results indicated that licorice roots could be well colonized by R. intraradices with mycorrhizal colonization percentages ranging from 25.0% to 48.4% which decreased with increasing biogas slurry concentrations. Mycorrhizal inoculation significantly increased plant biomass(by 171%~271%), P concentration(by 64%~143%) and leaf chlorophyll content(by 98%~127%). On the other hand, application of biogas slurry also noticeably increased root P concentration, leaf chlorophyll content, soil organic matter and P contents; but increased plant and soil heavy metal concentrations. Under biogas slurry dilution rate of 10/0 and 9/1, Cr, Cu and Pb concentrations in plants exceeded safety limit, while mycorrhizal inoculation significantly decreased plant Cr, Cu and Pb concentrations to meet the quality standard of herbal medicine. The study provided solid evidence for the growth promoting effect of biogas slurry in combination with AM fungi on licorice plants, and supported their potential use in intensive cultivation of this medicinal plants. |
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