摘要
对京津冀交界处污灌土壤进行实地调查,分期采集小麦、玉米、棉花和向日葵等作物及土壤样品进行分析测试,研究发现:研究区耕作层土壤中Cu和Zn含量具有明显的积累现象;棉花植株中Cu和Zn平均含量分别为6.09 mg kg-1、24.26mg kg-1,小麦籽粒中Cu和Zn平均含量分别为5.63 mg kg-12、7.20 mg kg-1,玉米籽粒中Cu和Zn平均含量分别为1.88 mg kg-1、43.38 mg kg-1,向日葵籽粒中Cu和Zn平均含量分别为27.80 mg kg-1、87.18 mg kg-1。向日葵籽粒中Cu和Zn含量超过国家食品卫生限量标准,不宜作为净化重金属的作物;棉花对土壤中Cu和Zn的输出量分别为123.38 g hm-2 a-14、91.27 g hm-2 a-1,对Cu和Zn具有较好的萃取效果,且为非食源性作物,可作为污灌土壤中Cu和Zn原位净化的物种。
Based on the field surveys of sewage irrigated soils in the border region of Jingjinji（namely Beijing,Tianjin,and Hebei）,the samples of soil,cotton,wheat,corn and sunflower were collected,and the contents of Cu and Zn in the samples were determined.The results showed that the contents of Cu and Zn had accumulated in surface soil irrigated witth sewage.The average contents of Cu and Zn were as follows： 6.09 mg kg-1 and 24.26 mg kg-1 in cotton,5.63 mg kg-1 and 27.20 mg kg-1 in wheat,1.88 mg kg-1 and 43.38 mg kg-1 in corn,and 27.80 mg kg-1 and 87.18 mg kg-1 in the seed of sunflower,respectively.The contents of Cu and Zn in the seed of sunflower were higher than the allowable limit of China National Food Security Standard,and hence it is not available for decontaminating soil polluted by heavy metals.The output contents of Cu and Zn by the cotton were 123.38 g hm-2 a-1 and 491.27 g hm-2 a-1,respectively.The cotton is a non-food source crop and has good effect of extracting Cu and Zn.Therefore it is a species to decontaminate the excess heavy metals in Situ in the sewage irrigation soil.
出处
《土壤通报》
CAS
CSCD
北大核心
2010年第5期1197-1202,共6页
Chinese Journal of Soil Science
基金
国家重点基础研究发展计划(2007CB407302)
教育部博士点基金(20050027022)
国家十一五科技支撑计划项目(2008BAB38B00)资助
关键词
污灌土壤
Cu和Zn
质量平衡
原位净化
Sewage irrigated soils
Cu and Zn
Mass balance
Decontamination in Situ
