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| Risk of cadmium in farmland soil after long-term application of carbonization straw |
| Received:January 05, 2018 |
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| KeyWord:cadmium;straw;biochar;soil;wheat;Diffusive Gradients in Thin films(DGT) |
| Author Name | Affiliation | E-mail | | ZHU Wen-bin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Shen-qiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHAO Xu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | wangyu@issas.ac.cn |
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| Abstract: |
| This study was conducted at the experimental site of the Yixing experimental station at Changshu National Agro-Ecosystem Observation and Research Station in Jiangsu Province, China. The effect of long-term continuous application of straw and straw-biochar on the cadmium concentration in soil and different tissues of wheat was examined after seven years of application. The results showed that compared to the control treatment(BC0 treatment), the soil concentration of total Cd was increased after the mount of 2.25 t·hm-2 straw (Straw2.25 treatment), 11.25 t·hm-2 biochar(BC11.25 treatment) and 22.5 t·hm-2 biochar(BC22.5 treatment) return to the field. With the application of 22.5 t·hm-2 biochar(BC22.5 treatment), the concentration of Cd in the grains, straws, and roots of wheat decreased significantly by 88.7%, 75.3%, and 52.8%, respectively(P<0.05). Furthermore, the bioavailability of Cd in soil was analyzed using the Diffusive Gradients in Thin films(DGT) technique. The results showed that the concentrations of soil DGT-Cd were reduced by 71.2%, 74.6%, and 83.4% with the Straw2.25, BC11.25, and BC22.5 treatments, respectively(P<0.05). DGT-Cd concentration was positively correlated with the concentration of cadmium uptake by wheat(P<0.01). Hence, the results of this study indicated that there was less risk of total Cd in soil in the short term, and the bioavailability of soil Cd was significantly reduced by returning straw resources to farmland soil on clean farms. |
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