| 摘要: |
| 为评估污泥产品在石质山地栾树林地土壤的应用潜力, 于 2023 年 7 月在北京市石质山地栾树
Koelreuteria paniculata 新造林地区开展田间试验, 设置每株 0 (CK)、 16 (T1)、 32 (T2)、 48 (T3)、 64
(T4) kg 共 5 个施用量梯度, 2024 年 9 月, 采集试验区及周围环境土壤样本, 分析其对土壤重金属含量
的影响, 并采用潜在生态风险评价和地累积指数法评估重金属污染风险。 结果表明, 施用污泥产品可显著
增加栾树林地试验区土壤 5 种重金属含量 (P<0. 05), 其中 Cu、 Zn、 Pb、 Ni 含量均在 T3 处理下最高,
Hg 含量在 T1 处理下最高。 相关性分析结果显示, Cu、 Zn、 Pb、 Ni 含量呈显著正相关, 而 Hg 含量与其
他重金属含量之间相关性不显著。 潜在生态风险评价和地累积指数评价表明, 施用污泥产品后栾树林地试
验区土壤 Hg 的风险等级呈上升趋势, 其他重金属则均为低风险; 污泥产品施用 1 a 后, 栾树林地周围环
境土壤重金属含量在 T3 或 T4 处理时存在显著升高的现象。 相关性分析结果显示, 施用污泥产品会减弱
周围环境土壤 Hg 含量与其他重金属含量之间的强关联性。 两种污染风险评价表明, 当施用量为 T3 或 T4
处理时, 周围环境土壤重金属的污染风险相对较高。 综上, 短期内将污泥产品施用量控制在每株 48 kg 以
下时, 栾树林地试验区及周围环境土壤 5 种重金属污染风险较低, 但仍要持续监测土壤重金属含量及污染
风险变化。 |
| 关键词: 污泥产品，栾树，土壤，重金属，风险评价 |
| DOI： |
| 分类号: |
| 基金项目:国家发改委环境污染第三方治理项目 (2017HXFWLXY023), 北京城市排水集团委托项目 (BJPS- 2022-JT-NCB-SC- 0037)。 |
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| Changes in Heavy Metal Contents and Pollution Risk Assessments of in Soils of Koelreuteria paniculata Woodland under Sludge Product Application |
|
jiaqingqi1, zhukun2, yaohai1, baijiayun1, gaoshitao1, pengzuodeng2
|
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1.Beijing City Drainage Group Ltd;2.Beijing Forestry University
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| Abstract: |
| To evaluate the application potential of sludge products in the soil of Koelreuteria paniculata woodland in stony mountainous areas, a field experiment was conducted in July 2023 in a newly afforested stony
mountainous region in Beijing. Five application amount gradients were set up: 0 (CK), 16 (T1), 32 (T2),
48 (T3), and 64 (T4) kg per plant. By September 2024, soil samples were collected from the experimental
area and the surrounding environment to analyze the effects of the application on soil heavy metal content, and
the potential ecological risk assessment and the geo-accumulation index method were used to evaluate the heavy
metal pollution risk. The results showed that the application of sludge products increased the content of five
heavy metals in the soil of the K. paniculata woodland experimental area. Among them, the contents of Cu,
Zn, Pb, and Ni were all the highest under the T3 treatment, while the Hg content was the highest under the T1
treatment. The results of correlation analysis showed that the contents of Cu, Zn, Pb, and Ni were significantly positively correlated, while the correlation between Hg content and the contents of other heavy metals was not
significant. The potential ecological risk assessment and geo-accumulation index evaluation indicated that after
the application of sludge products, the risk level of Hg in the soil of the K. paniculata woodland experimental area showed an increasing trend, while all other heavy metals were at low risk. One year after application of
sludge products, the heavy metal contents in the soil of the surrounding environment were significantly increased
under the T3 and T4 treatments. The results of correlation analysis showed that the application of sludge products
weakened the strong association between Hg content and the contents of other heavy metals in the surrounding environment soil. The two pollution risk evaluation methods indicated that when the application amount was the T3
or T4 treatment, the pollution risk of heavy metals in the surrounding environment soil was relatively high. In
conclusion, when the application amount of sludge products was controlled below 48 kg per plant in the short
term, the pollution risk of the five heavy metals was low in both the K. paniculata woodland experimental area
and the surrounding environment soil. However, continuous monitoring of changes in soil heavy metal content
and pollution risk is necessary. |
| Key words: sludge products Koelreuteria paniculata soil heavy metals risk assessment |
