猪场沼液组分特征对土壤镉活性的影响

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中图分类号：X713；X53 文献标志码：A 文章编号：1672-2043（2025）05-1399-10 doi：10.11654/jaes.2024-0434

Abstract：This study aims to investigate the effect of biogas slurry fractions with different molecular weights on soil cadmium activity. Pig biogas slurry was filtered， centrifuged， and concentrated via ultrafiltration， resulting in eight treatment groups ∵ control（CK）， primary biogas slurry addition（T1）， biogas slurry particulate organic matter（POM）addition（T2）， biogas slurry dissolved organic matte（DOM）addition （T3）， > 30 kDa biogas slurry addition（T4）， 10-30 kDa biogas slurry addition（T5）， 1-10 kDa biogas slurry addition（T6）， and <1 kDa biogas slurry addition（T7）. The incubation period for each treatment group was . The effective cadmium content of soil in the treatment group was significantly reduced compared with CK， in which the effective cadmium content reduction rates of T6 and T7 treatments were 39.41% and 31.01% on the 7th day， and 34.91% and 53.33% on the 30th day， respectively， which were significantly higher than those of the other treatments. Our results indicated that biogas slurry with a molecular weight of <10 kDa exhibited a better passivation effect on soil cadmium as well as superior long-term stability. The primary mechanism of action involves altering the physical and chemical properties of soil， which increases the fluorescent components of soil organic matter， aromatic substances， and high-molecular-weight organic matter. This transformation promotes the conversion of cadmium from weakly acidic and reducible states to oxidizable and residual states， thereby reducing the bioeffectiveness of cadmium.

Keywords：cadmium; biogas slurry; soil; components; activity

镉是我国耕地土壤中超标最严重、关注度最高的一种重金属元素，镉在土壤中的生物有效性及环境行为主要依赖于其赋存形态而非全量。（剩余19365字）