沼气肥中重金属在土壤-蔬菜中的迁移转化规律——以白菜为例

发布时间：2018-11-17 17:57

【摘要】：通过盆栽试验,以沙土为基质,施加沼气肥种植白菜,测定并计算白菜、土壤中重金属含量、元素相关性、土壤-植物化学计量比、富集系数等指标,旨在研究As、Cu、Cr、Zn在土壤-蔬菜中的转移规律。结果显示,土壤中As、Zn含量随沼气肥浓度的增加变化趋势明显,沼渣组As、Zn含量呈上长—下降趋势(180 g为拐点),沼渣+沼液组As含量呈下降趋势,Zn含量呈增加-下降趋势(1∶5/120 g为拐点),沼液组As含量逐渐增加;随沼气肥浓度增加,白菜重金属含量变化复杂,试验组分别在梯度为180 g、1∶5/180 g、1∶5时,元素含量最多,为180 g;沼渣、沼渣+沼液、沼液施肥使土壤中As含量最多,土壤中全部超标、蔬菜中部分超标;白菜中以Cr最多,为1∶5/180 g,且全部超标,即土壤-蔬菜中As迁移能力最弱,Cr最强。
[Abstract]:Through pot experiment, applying biogas fertilizer to plant cabbage in sandy soil, the content of heavy metals in soil, the correlation of elements, the ratio of soil to plant chemistry and the enrichment coefficient were determined and calculated. The aim of this study was to study As,Cu,Cr,. The transfer of Zn in soil-vegetable. The results showed that the content of As,Zn in soil changed obviously with the increase of biogas concentration. The content of As,Zn in the group of biogas residue showed an upward and descending trend (180g as the inflexion point), and the content of As in the group of biogas residue showed a tendency of decreasing. The content of Zn increased and decreased (1: 5 / 120g was the inflexion point), and the content of As increased gradually in the group of biogas liquid. With the increase of biogas fertilizer concentration, the change of heavy metal content in Chinese cabbage was complicated. When the gradient of the test group was 180 g / 1: 5 / 180 g / 1 / 5, the content of elements was the highest (180 g / L). Biogas residue, biogas residue biogas liquid, biogas liquid fertilization made the content of As in soil the most, all in soil exceeded the standard, and some in vegetables exceeded the standard. In Chinese cabbage, Cr is the most, it is 1: 5 / 180g, and all exceed the standard, that is, the ability of As migration in soil-vegetable is the weakest, Cr is the strongest.
【作者单位】：江西师范大学地理与环境学院;江西省山江湖开发治理委员会办公室;
【基金】：江西省科技支撑计划(编号:20132BBF60079) 江西省科技成果重点转移转化计划(编号:20142BBI90022) 江西省教育厅2012年科技落地计划项目“鄱阳湖沙化土地与水土流失治理技术推广与示范”
【分类号】：S141;S634

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