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本研究以湖南省攸县为例,测定重金属镉(Cd)在585个灌溉水样品和625对土壤蔬菜样品中的含量水平,结合农业与气象调查数据,应用典型相关分析及路径分析模型研究各环境因子对于Cd在土壤-蔬菜系统累积水平的影响.结果表明研究区灌溉水、土壤、蔬菜中Cd含量差异较大.蔬菜Cd富集因子(PUF)服从自然对数分布,有10%的概率大于1.土壤pH和土壤有机质对PUF有着显著的直接效应,土壤阳离子交换量,灌溉水pH,降雨量和氮肥施肥量通过与pH及土壤有机质的相关关系间接影响PUF变化.研究区土壤pH和土壤有机质含量较低,对于Cd在土壤-蔬菜系统中的累积风险应给予一定关注.
This study took You County of Hunan Province as an example to determine the content of heavy metal cadmium (Cd) in 585 irrigation water samples and 625 soil vegetable samples. Based on the data of agricultural and meteorological survey, using canonical correlation analysis and path analysis model The effect of environmental factors on the accumulation of Cd in soil-vegetable system showed that the content of Cd in irrigation water, soil and vegetables differed significantly in the study area, and the vegetable Cd accumulation factor (PUF) obeyed the natural logarithmic distribution with a probability of 10% Is greater than 1. Soil pH and soil organic matter have a significant direct effect on PUF, and soil cation exchange capacity, irrigation water pH, rainfall and nitrogen fertilization indirectly affect PUF change through correlation with pH and soil organic matter.The soil pH and Soil organic matter content is low, and some attention should be given to the cumulative risk of Cd in the soil-vegetable system.