摘要
为研究土地利用方式对川芎镉累积及与人体健康的关系,以彭州川芎种植区的菜-药、稻-药(翻耕)、稻-药(免耕)和旱地种植方式下土壤和川芎为研究对象,采用统计分析法和靶标危害系数法(THQ)研究了川芎地上部分和地下根茎镉累积的特征及其对人体的健康风险贡献,结果表明:四种土地利用方式下,川芎种植土壤中Cd含量平均为0.73mg/kg,超过国家二类土壤标准(GB 15618—1995);川芎植株中镉的含量由高到低依次为菜-药>免耕>翻耕>旱地方式,均超过《川芎地理标志保护产品》标准。菜-药种植中土壤镉含量显著高于其他三种方式,在该方式下,川芎植株中地上部分镉含量是根茎的1.67倍,超过《地理标志保护产品》标准9.46倍,超过《食品污染限量标准》1.62倍,根茎中镉含量超过《绿色行标》0.11倍。本研究中,川芎地上部分与种植土壤在镉含量上呈显著线性相关,而川芎根茎与土壤在镉含量上相关性不明显;川芎地上部分对人体镉的健康风险贡献(THQ)值平均为63.18%,是根茎(11.50%)的5.49倍。
In order to analyze the influence of land use types on cadmium accumulation of L.Chuanxiongand its contribution to health risk,four different land use types as vegetable-herb,paddy-herb(tillage),paddy-herb(no-tillage)and dry land were investigated in the Pengzhou herb-plantation area by using statistical analysis and THQ method.Results showed that the average content of the four types of soils was 0.73mg/kg,exceeding the standard of GB 15618—1995.The total Cd concentration in L.Chuanxiongplant showed a decreasing order from high to low in the four types as vegetable soil no-tillage soil tillage soildry land and exceeded the standard of product of geographical indication Dujiangyan Chuanxiong,too.Furthermore,the content of Cd in the vegetable-herb type was significantly higher than that in the other three types.Under this type,the cadmium concentrations in the over ground part of L.chuanxiongwere 9.46 times those of the"product of geographical indication"and exceeded the maximum levels of contaminants in foods by 1.62 times,too.The content of Cd in the acrial part was 1.67 times higher than that in rhizome,while the latter exceeded the foreign trade industry standards by 0.11 times.Based on the study,cadmium concentrations in the over ground part of L.Chuanxionghad significantly linear correlations with those in soil,while it was not the case for rhizome.The over ground part accounted for a mean factor of 63.18%to human health risk and was 5.49 times that of the rhizome(11.50%).
出处
《地球与环境》
CAS
CSCD
北大核心
2014年第6期779-783,共5页
Earth and Environment
基金
中国地质调查局项目"四川省成都经济区生态地球化学调查"(200214200027)
成都理工大学研究基金"地球化学因素对川芎品质的影响研究"(2010YG03)
关键词
川芎
CD
土地利用方式
土壤
健康风险
Ligusticum chuanxiong
cadmium
land use type
soil
health risk