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| Effects of Different Biochar on Copper Forms in Soil and Absorption and Transfer Enrichment of Corn in Sewage Irrigation Area |
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| DOI：10.16768/j.issn.1004-874X.2020.04.009 |
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| Abstract: |
| 【Objective】The effects of biochar from mushroom bran on the forms of heavy metal copper and the absorption and transfer enrichment of corn in sewage irrigation area were studied, and horizontal comparison was conducted on the effects of three kinds of mushroom bran biochar, corn stalk biochar and rice husk biochar.【Method】The forms of heavy metal copper, the heavy metal contents of various parts of corn and the transfer and enrichment coefficients of different parts of the corn to heavy metal copper were analyzed by the application of five kinds of biochar in the soil of a sewage irrigation area in Shanxi through pot experiment.【Result】Under five different biochar treatments, the exchangeable copper content in the soil was lower than that of the blank control. Among them, the EXC-Cu content in the soil was the lowest under LC treatment, which was 1.005 mg/kg, 31.4% lower than the blank control. The CA-Cu content in the soil of all treatments was reduced compared with that of the blank control. Under the HC treatment, the reduction of CA-Cu content was the maximum and the value reduced to 5.91 mg/kg, which was reduced by 40.65% compared with that of the blank control. Except that the R2O3-Cu content under HC treatment increased by 2.25% compared with the blank control, R2O3-Cu content in soil of the other four treatments decreased slightly. OM-Cu content changed inconsistently. RES-Cu content of all treatments was increased compared with that of the blank control. Under the HC treatment, the increase of RES-Cu content was the maximum, which was 104.55 mg/kg, 15.76% higher than that of the blank control. The transfer coefficients of corn to copper under various treatments were all less than 1, while the enrichment coefficients changed differently.【Conclusion】All of the five different biochar could increase the inactive Cu content and decrease the active Cu content in the soil, which provided some scientific basis for the effective utilization of biochar and the decrease of the effectiveness of Cu content in the heavy metal contaminated soil. |
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