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| The effect of toxicity of soil supplemented with cobalt on barley root elongation and cobalt toxicity prediction models |
| Received:June 16, 2020 |
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| KeyWord:soil;cobalt;phytotoxicity;barley;regression models |
| Author Name | Affiliation | E-mail | | LI Jin-ping | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China | | | WANG Xue-dong | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China | xdwang@cnu.edu.cn | | MA Hong | College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China | | | MA Yi-bing | Macau Environmental Research Institute, Macau University of Science and Technology, Macau 999078, China | |
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| Abstract: |
| Barley(Hordeum vulgare L.)root elongation assays were performed in 11 Chinese agricultural soils to study the phytotoxicity of exogenously added cobalt(Co), and the effects of soil properties on the toxicity thresholds of barley root elongation to Co were investigated. The results showed that the Co concentrations that caused 10% inhibition (EC10)of barley root elongation ranged from 37.1 to 3 914 mg·kg-1, representing 105.5-fold variation among the 11 different soils. The concentrations for 50% inhibition (EC50)ranged from 166.1 to 6 030 mg·kg-1, representing 36.3-fold variation among soils. Regression relationships among soil properties and toxicity thresholds were established and revealed that soil pH was the most important factor in predicting Co toxicity thresholds, as pH was found to explain 77.6% and 72% of the variance in EC10 and EC50, respectively (P ≤ 0.001). When incorporating pH and soil clay into the EC10 predictive model, 83.9% of the variance in EC10 could be predicted. Furthermore, 86.1% of the variance in EC50 could be explained by incorporating pH and total carbon (TC)into the EC50 predictive model(P<0.001). The Co toxicity threshold predictive models obtained from Chinese soils and from European and North American soils were compared, and it was found that the predictive models based on Chinese soils could predict the Co toxicity thresholds in European and North American soils, but not vice versa. This study demonstrates that Co toxicity thresholds are greatly affected by soil properties and that predictive models based on soil properties can provide a basis for Co ecological risk assessments in soils. |
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