开封黑岗口引黄灌区稻麦轮作下农田土壤剖面重金属分布特征

Vertical distribution characteristics of heavy metals in agricultural soil profiles under rice-wheat system in Heigangkou Yellow River Irrigation Region

摘要: 引黄灌区是我国重要的农业生产基地, 其土壤重金属赋存状况直接关系到农业的可持续发展。本研究以黑岗口引黄灌区开封北郊稻麦轮作下农田土壤为研究对象, 采集了耕作层(0~15 cm与15~30 cm)与剖面(0~100 cm)土壤样品, 对其土壤剖面主要性质与重金属Pb、Cd、Cu和Zn的积累特征进行了分析。结果表明: (1)长期引黄灌溉及稻麦轮作下, 开封北郊农业土壤主要性质在剖面上表现出明显的分异特征: 总有机碳(TOC)与全氮(TN)含量主要分布在耕作层土壤, 而30 cm以下的土层其含量明显降低; 全磷(TP)含量在各土壤层中无明显差异; 在部分土壤剖面中CaCO₃

Abstract: Yellow River Irrigation Region (YRIR) is one of China’s important grain production bases. The contents and chemical forms of heavy metals in the agricultural soils of the region are related to sustainable agricultural development. The distribution of main soil properties total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP) and CaCO₃₃