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滩涂围垦区土壤重金属调查及生态风险评价——以盐城市弶港镇为例

ISSN号：1672-2043
期刊名称：《农业环境科学学报》
时间：0
分类：X820.4[环境科学与工程—环境工程]
作者机构：[1]中国科学院南京土壤研究所,南京210008, [2]盐城绿苑海蓬子开发有限公司,江苏盐城224001
相关基金：公益性行业（农业）科研专项经费项目（200903001）; 江苏省企业院士工作站（BM2009622）; 江苏省科技支撑计划（BE2010313）; 江苏省产学研联合创新资金计划（BY2010013）; 江苏省自然科学基金项目（BK2011425）

作者：孟庆峰[1], 杨劲松[1], 姚荣江[1], 李冬顺[1], 张春银[2], 吉荣龙[2]

关键词：滩涂围垦土壤, 重金属, 生态风险评价, reclaimed tidal flat soil, heavy metal, ecological risk assessment

中文摘要：

以苏北盐城弶港镇滩涂围垦土壤为研究对象,进行了重金属Cr、Pb、As、Cd、Hg的测定及其风险评价,为我国沿海滩涂种植业的发展提供依据,并为其他国家和地区相关研究提供参考。结果表明,该区域土壤中5种重金属含量均未超过《国家土壤环境质量标准》（GB15618—1995）一级标准限制,农田土壤Cr、As、Cd含量较高,郊区菜地土壤Pb、Hg含量较高;重金属Cr、Pb、As、Cd含量在不同土地利用类型间存在显著性差异;Hg含量差异不显著。采用地积累指数法进行评估可知,土壤没有受到单项重金属污染。依据内梅罗综合指数法评估可知,潮间带沉积物、工业区土壤、滩涂围垦熟化的土壤没有受到重金属污染;郊区菜地与农田土壤的污染等级已达到警戒线,污染水平属于＂尚清洁＂。Hakanson潜在生态风险评价结果表明,区域内土壤重金属处于无风险等级,尚不具有潜在生态风险。

英文摘要：

The reclaimed tidal flat soils were taken as study objects in Jianggang County of Yancheng City, Jiangsu Province of China,in order to supply reference for coastal development of farming and related study in other countries and regions,though determinations and risk assessments of heavy metal Cr, Pb, As, Cd and Hg. 48 soil samples were collected within five land utilization types in survey area. The characteristics of heavy metal enrichment in reclaimed tidal flat soil were surveyed, and the environmental risk assessment was conducted systematically using such methods as geoaccumulation index, N.L.Nemerow index and Hakanson potential ecological risk index.The results showed the mean values of 5 kinds of heavy metal did not exceed the GradeⅠ of Environmental Quality Standards for Soil in survey area;the contents of Cr, As, Cd in farmland soils were generally higher, similarly, the contents of Pb, Hg in suburban vegetable soils were higher than the other land utilization types. There were statistically significant differences in Cr, Pb, As and Cd among different land utilization types, while mean values of Hg were not significant differences in all the land utilization types. Based on geoaccumulation index, the soils were not contaminated by single heavy metal in survey area. Intertidal sediments, soils of industrial area and reclaimed tidal flat soils were not contaminated by heavy metals. Pollution levels of suburban vegetable and farmland soils were exceeded security limit, but soils were in non-pollution state though N.L.Nemerow index method. The heavy metals in survey area among different land utilization types were in the risk-free level and were not the potential ecological risks by Hakanson potential ecological risk index method.