| 李世杰,刘鑫,李世旗,杨志敏,陈玉成.猪场沼液组分特征对土壤镉活性的影响[J].农业环境科学学报,2025,44(5):1399-1408. |
| 猪场沼液组分特征对土壤镉活性的影响 |
| Influence of swine farm biogas slurry fractions on soil cadmium activity |
| 投稿时间：2024-05-23 |
| DOI：10.11654/jaes.2024-0434 |
| 中文关键词: 镉 沼液 土壤 组分 活性 |
| 英文关键词: cadmium biogas slurry soil components activity |
| 基金项目:重庆市固体废物管理中心科技项目（CQGGZX2024003）；重庆市长江生态环境保护修复驻点跟踪研究（重庆）专题（F2020299） |
| 作者 | 单位 | E-mail | | 李世杰 | 西南大学资源环境学院, 重庆 400716
招商局生态环保科技有限公司, 重庆 400060 | | | 刘鑫 | 西南大学资源环境学院, 重庆 400716 | | | 李世旗 | 西南大学资源环境学院, 重庆 400716 | | | 杨志敏 | 西南大学资源环境学院, 重庆 400716
农村清洁工程重庆市工程研究中心, 重庆市生态环境农用地土壤污染风险管控重点实验室, 重庆 400716 | | | 陈玉成 | 西南大学资源环境学院, 重庆 400716
农村清洁工程重庆市工程研究中心, 重庆市生态环境农用地土壤污染风险管控重点实验室, 重庆 400716 | 372505096@qq.com |
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| 中文摘要: |
| 为探究不同分子量的沼液组分还田对土壤镉活性的影响，将猪场沼液过滤、超滤浓缩，设置对照（CK）、原始沼液（T1）、沼液颗粒有机质（T2）、沼液溶解性有机质（T3）、>30 kDa沼液（T4）、10~30 kDa沼液（T5）、1~10 kDa沼液（T6）、<1 kDa沼液（T7）8个处理，静置培养30 d。结果表明，处理组土壤有效态镉含量相较于CK显著降低，其中T6、T7处理第7天有效态镉含量降低率分别为39.41%和31.01%，第30天分别为34.91%和53.33%，降幅显著高于其他处理。研究表明，沼液分子量<10 kDa时对土壤镉的钝化效果较好且更具备稳定性，其作用机理主要是通过改变土壤理化性质、提高土壤有机质荧光组分、芳香性物质和大分子量有机质含量，促进弱酸提取态镉、可还原态镉向可氧化态、残渣态镉的转化，从而降低镉的生物有效性。 |
| 英文摘要: |
| 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 30 d. 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. |
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