两种设施蔬菜土壤重金属与TOC的预测模型及环境预警值  

A correlation forecast model between heavy metals content and TOC in the two kinds of greenhouse vegetables soil and their environmental prewarning value

作　　者：冯圣东[1] 贾海滨[1] 张雪娜[1] 张丽秀[1] 高夕彤 卢金海[1] 李博文[1] 杨志新[1] 

机构地区：[1]河北农业大学资源与环境科学学院河北省农田生态环境重点实验室,河北保定071001

出　　处：《安全与环境学报》2016年第2期329-333,共5页Journal of Safety and Environment

基　　金：国家科技支撑计划项目(2012BAD15B02);河北省自然科学基金项目(D2015204174);河北省教育厅项目(ZH2012034;ZD2013013)

摘　　要：为了了解设施蔬菜土壤的环境安全性,采用野外调查和室内分析相结合的方法,以河北省永清县蔬菜主产区设施芹菜和西红柿的土壤为研究对象,研究了土壤重金属与总有机碳(TOC)的关系。结果表明,设施西红柿土壤中除Pb分布均匀外,其余重金属Cd、Cr、As、Hg均有明显的变异特征,其中,Hg的变异系数高达85.8%,属于强分异型分布;芹菜土壤中Cd、Pb、Hg均具有分异性分布特征,其中,Hg属于强分异型分布。同样,西红柿和芹菜土壤中TOC均呈现分异性特征。西红柿土壤中Cd质量比与土壤TOC质量比之间呈现显著或极显著的线性、对数、二次函数、幂函数、指数函数正相关,芹菜土壤Cd质量比与土壤TOC质量比之间呈现显著的幂函数和指数正相关,进一步利用呈显著相关的预测模型确定了西红柿和芹菜土壤TOC的环境安全预警值分别为14.65 g/kg和12.06 g/kg。在永清县设施大棚管理模式下,土壤TOC质量比一旦超过该预警值,就预示着土壤存在Cd污染的风险,应及时监测以有效规避重金属污染风险。The paper is engaged in a field survey and laboratory analysis in hoping to make an exploration of the correlation between the heavy metal contents,such as those of Hg,Cd,Cr,Pb,As,and the total organic carbon（ TOC） content in the topsoil（ 0- 20 cm depths） of the land from the greenhouse planting tomato and celery in Yongqing,Hebei. When the said survey is done,we have made a detailed analysis of the variation of the aforementioned heavy metal contents and the total organic carbon（ TOC） content in the topsoil. The results of our survey and analysis indicate that the contents of the other heavy metals in the soil for tomato planting reveal noticeable spatial variation except for that we have detected the uniform distribution features of Pb,whereas the content of Hg proves to be of quite great variation in distribution. Furthermore,the contents of Hg,Pb,Cd in the celery soil indicate quite spatial variation with the content of Hg,which proves a nice agreement between the celery soil and the soil for tomato planting. In a similar way,the variation coefficient of the TOC in the fields for tomato and those for celery indicate different characteristic features. The five forecast models we have adopted,（ including the linear,logarithmic,quadric,power function and the index equation ones we have established to test the particular features of the soil heavy metals in the soil）,reveal significant positive correlation between the soil Cd and TOC in the tomato soil. What is more,there exists significant positive correlation between the soil Cd and the TOC contents,in addition to the power function and the index equation in the soil for celery planting. When we adopted the above said closely related prediction models further to determine the warning values of the environmental safety,we have found the rates of the heavy metal contents from the soil TOC of tomato and celery respectively as 14. 65 g / kg and 12. 06 g / kg. Once the content of the soil TOC has been found exceeding the limited standards in the toma

关 键 词：环境学 设施芹菜和西红柿 土壤总有机碳 重金属 空间分异 环境安全预警值 预测模型 

分 类 号：X53[环境科学与工程—环境工程]