ABSTRACT

Biosolid-borne heavy metals are the main concern in soils. Therefore, the effects of biosolid biochar application in soils were evaluated in our study through a rice-wheat rotation in fields. The results showed that after the application of biosolid biochar, soil organic matter (SOM), soil pH, and soil total heavy metal concentrations (Cd, Zn, Cu, and Pb) were significantly increased. But the CaCl₂ extracted metals concentrations were decreased, and no significant differences in metal concentrations of soil deeper layers (20–100 cm) were found among different treatments. The Cd, Zn, Cu, and Pb concentrations in rice decreased by 13.2%, 37.0%, 9.92%, and 63.0%, respectively, and the concentrations of Cd, Zn, Cu, and Pb in wheat decreased by 20.85%, 19.7%, 48.6%, and 23.6%, respectively, compared with the control treatment. Biosolid biochar can decrease metal availability in soils and increase crop production in fields, thus is suggested to use in fields.

摘要

生物固体传播的重金属是土壤中的主要问题。因此，我们的研究通过田间稻麦轮作来评估生物固体生物炭在土壤中的应用效果。结果表明，施用生物固体生物炭后，土壤有机质（SOM）、土壤pH值和土壤总重金属浓度（Cd、Zn、Cu和Pb）显着增加。但CaCl ₂提取的金属浓度降低，不同处理间土壤深层（20-100 cm）金属浓度没有显着差异。水稻中Cd、Zn、Cu、Pb含量分别下降13.2%、37.0%、9.92%和63.0%，小麦中Cd、Zn、Cu、Pb含量分别下降20.85%、19.7%与对照处理相比，分别为 48.6% 和 23.6%。生物固体生物炭可以降低土壤中金属的利用率，提高田间作物产量，因此建议在田间使用。