| 郭江山,顾卫华,白建峰,董滨,庄绪宁,赵静,王景伟.电子废弃物拆解污染土壤施用污泥发酵渣对香根草吸收与转运重金属的影响[J].农业环境科学学报,2022,41(7):1452-1459. |
| 电子废弃物拆解污染土壤施用污泥发酵渣对香根草吸收与转运重金属的影响 |
| Effects of sludge fermentation residue on the accumulation and transport of heavy metals in Vetiveria zizanioides at an e-waste dismantling site |
| 投稿时间：2021-11-01 |
| DOI：10.11654/jaes.2021-1240 |
| 中文关键词: 污泥发酵渣 土壤修复 重金属 腐殖质 香根草 |
| 英文关键词: sludge fermentation residue soil remediation heavy metal humus Vetiveria zizanioides |
| 基金项目:国家自然科学基金项目(51578397);国家重点研发计划项目(2019YFC1906100) |
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| 中文摘要: |
| 为探究施用污泥高温好氧发酵渣(以下简称"发酵渣")对电子废弃物拆解污染土壤改良和植被恢复的影响,通过盆栽试验比较添加不同剂量发酵渣(3%和6%)对土壤有机质、养分、重金属形态及香根草吸收与转运重金属等的影响。结果显示:施用发酵渣显著提高了土壤溶解性有机质的荧光指数和在226~400 nm范围内的紫外吸光度积分值,但显著降低了自生源指数;显著提高了土壤电导率、有效磷和速效钾含量,但显著降低了土壤pH。与未修复土壤相比,所有处理(含不添加发酵渣的CK处理)均提高了重金属稳定态比例;与CK相比,施用发酵渣显著提高了Cu、Pb、Zn和Cd的稳定态比例,增幅分别为4.8~7.3、7.8~9.0、3.7~6.4个和1.8~4.0个百分点。施用发酵渣促进了香根草生长,其中3%添加量处理使香根草鲜质量、株高和叶绿素a+b含量分别显著增加8.2%、11.9%和6.6%,但6%添加量处理对株高和叶绿素a+b含量的提高效果不显著。施用发酵渣降低了香根草中Cu、Cd、Zn和Pb的富集量,降幅分别为10.4%~20.6%、24.0%~52.0%、2.5%~5.1%和12.4%~23.6%;抑制了香根草对Cu、Zn和Pb向地上部转运,但促进了Cd向地上部转运。研究表明,施用污泥发酵渣可以改良土壤性状,促进重金属稳定和香根草生长,具有污染场地土壤生态修复的应用潜力。 |
| 英文摘要: |
| To explore the effects of high-temperature aerobic fermentation sludge residue (hereinafter referred to as 'fermentation residue') on soil improvement and Vetiveria zizanioides growth at an e-waste dismantling site, a potting experiment was performed by adding different dosages of fermentation residue to the soil (the ratios of fresh weight were 3% and 6%) . Parameters such as soil organic matter, nutrients, and heavy metals fraction, accumulation, and transport in the plant were analyzed. The results showed that the application of fermentation residue significantly increased the fluorescence index and the integral value of UV absorbance of soil dissolved organic matter in the range of 226~400 nm, whereas the biogenic index showed the opposite trend. The fermentation residue significantly increased the soil conductivity and the content of available phosphorus and potassium but significantly reduced the soil pH. Compared to the original soil without remediation, all treatments increased the proportion of the stable fractions of heavy metals. Compared to the control, the application of fermentation residue significantly increased the proportion of Cu, Pb, Zn, and Cd in stable fractions by 4.8~7.3, 7.8~9.0, 3.7~6.4 percent points, and 1.8~4.0 percent points, respectively. The application of fermentation residue promoted the growth of Vetiveria zizanioides, and the addition of 3% fermentation residue significantly increased the fresh weight, plant height, and chlorophyll a+b content by 8.2%, 11.9%, and 6.6%, respectively. The fermentation residue reduced the concentrations of Cu, Cd, Zn, and Pb in the plant at rates of 10.4%~20.6%, 24.0%~52.0%, 2.5%~5.1%, and 12.4%~23.6%, respectively. Fermentation residue inhibited the transport of Cu, Zn, and Pb to the aboveground parts of the plant, but promoted the transport of Cd. Our results indicate that the application of fermentation residue introduces humus into the soil, improves soil properties, and promotes the stabilization of heavy metals and the growth of Vetiveria zizanioides. Fermentation residue has potential application value for the ecological restoration of soil in contaminated sites. |
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