| 城市绿地不同管理方式土壤重金属污染及生态风险评价 |
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| 引用本文： | 孟婷婷,刘金宝,董浩,王博,张国剑.城市绿地不同管理方式土壤重金属污染及生态风险评价[J].环境工程,2022,40(12):217-223. |
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| 作者姓名： | 孟婷婷 刘金宝 董浩 王博 张国剑 |
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| 作者单位： | 1. 陕西省土地工程建设集团有限责任公司, 西安 710075; |
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| 基金项目： | 陕西省科技成果转移与推广计划(2021CGBX-03)长安大学重点科研平台开放基金(300102351501) |
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| 摘 要： | 土壤重金属污染是威胁城市生态环境的关键问题,为探究城市绿地不同管理措施下土壤修复效果,以城市不同管理措施绿地土壤为研究对象,测定复垦土地不同管理措施土壤中的Cr、Ni、Cu、Zn、As、Cd、Pb含量,并通过单因子污染指数法、内梅罗综合污染指数、地质累积指数法、潜在生态风险评价法定量分析了不同管理方式下土壤重金属污染及生态风险程度。结果表明:1)不同管理方式下土壤中Cr、Ni、Cu、Zn、As、Cd、Pb含量均高于陕西省背景值,不同管理方式下土壤重金属含量顺序为自然生长＞灌溉＞施肥;2)各重金属含量随土壤深度增加的变化趋势为逐渐减小或先减小后增加,且在20~40 cm深度取得最小值;3)Cd是造成该地区生态风险的主要元素,为轻污染,且是污染程度最高的元素。灌溉和施肥措施对土壤重金属污染修复效果优于自然生长,合理布设城市绿地措施有利于城市绿地土壤重金属污染修复、城市生态环境质量改善。
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| 关 键 词： | 城市绿地 土壤修复 重金属污染 生态风险 管理方式 |
| 收稿时间： | 2021-07-15 |
SOIL HEAVY METAL POLLUTION AND ECOLOGICAL RISK ASSESSMENT OF URBAN GREEN LAND UNDER DIFFERENT MANAGEMENT METHODS |
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| Affiliation: | 1. Shaanxi Provincial Land Engineering Construction Group Co., Ltd, Xi'an 710075, China;2. Institute of Shaanxi Land Engineering and Technology Co., Ltd, Xi'an 710075, China;3. Xi'an University of Technology, Xi'an 710048, China;4. Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Land and Resources, Xi'an 710075, China |
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| Abstract: | Treatment of heavy metal pollution in urban ecological environment becomes an urgent environmental problem. In order to explore the difference of remediation effect of heavy metal pollution in urban green space under different management measures, experimental plots with different management methods were established as the research object, and soil samples were collected to determine the contents of Cr, Ni, Cu, Zn, As, Cd and Pb in soil. The quantitative analysis of soil heavy metal pollution and ecological risk under different management methods by combining the single factor pollution index method, the Nemerow comprehensive pollution index, the geo-accumulation index method and the potential ecological risk assessment method. The results showed: 1) the contents of Cr, Ni, Cu, Zn, As, Cd and Pb in soil under different management methods were higher than the background value of Shaanxi Province. The contents of heavy metals in soil under different management methods were in an order of natural growth > irrigation > fertilization; 2) the variation trend of heavy metal content with the increase of soil depth was gradually decreasing, or first decreasing and then increasing, and the minimum value was obtained at the depth of 20 to 40 cm; 3) Cd was the main element causing ecological risk in the region, which is in light pollution state but with highest pollution level. Irrigation and fertilization have better remediation effect on soil heavy metal pollution than natural growth. Reasonable layout of urban green space management measures is conducive to the remediation of soil heavy metal pollution in urban green space and improvement of urban ecological environment quality. |
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