沼液灌溉对土壤重金属的影响

摘要

Objective] This study aimed to investigate the effects of biogas slurry irri-gation on heavy metal contents in soils. [Method] A pot experiment was carried out to investigate the effects of biogas slurry irrigation on the accumulation of heavy metals in soils by measuring the contents of Cu, Zn, Pb, Cr and Cd in different soil layers. [Result] The results showed that original and 30-fold biogas slurry increased the contents of Cu, Zn, Pb, Cd and Cr in soils; Cr might partial y reach an exces-sive level in a short term. Biogas slurry irrigation increased the downward migration velocity of Cu and reduced the downward migration velocity of Zn in soils. [Conclu-sion] Biogas slurry irrigation influences the contents of heavy metals, and long-term application of biogas slurry wil lead to the accumulation of heavy metals in soils.%[目的]为研究沼液灌溉对土壤中重金属含量的影响。[方法]采用盆栽控制灌溉方法，分层研究土壤中 Cu、Zn、Pb、Cd、Cr含量的变化。[结果]沼液原液和稀释30倍沼液灌溉都会增加土壤中 Cu、Zn、Pb、Cd、Cr的含量，其中短期内重金属 Cr存在局部超标的可能。沼液灌溉增加了 Cu在土壤中向下的迁移速度，降低了 Zn在土壤中向下的迁移速度。[结论]沼液灌溉会对土壤中重金属含量造成影响，长期使用会引起在土壤中的累积。