摘要
采取逐级提取法对江苏盐城某污水灌溉湿地土壤中的铬的赋存形态以及其上生长的主要植物芦苇的不同组织部位中的总铬进行了分析测定,并研究其生物有效性。结果表明:与对照点相比,污灌土壤中铬质量分数明显升高而受到不同程度的污染,其赋存形态质量分数由高到低顺序为残渣态(RES-)→铁锰态((OFeMn-))→碳酸态(CARB-)→有机态(OM-)和交换态(EX-)之和。芦苇不同组织部位中铬分布研究表明根部质量分数远大于茎和叶,说明根系吸收为主要作用,而后迁移至其它易积累部位。对各种形态的铬与植物中的铬总量之间的相关性进行了分析,相关系数表明,植物中的生物富集量与各种赋存形态都有一定的线性关系,其中强有机质结合态与生物富集量具有最好的线性相关性。
The depositing forms of the species of chromium in soil and the total chromium in different part of the growing plants in the wetland irrigated by wastewater of Yancheng city of Jiangsu province were investigated by sequential extraction procedures. The results indicated that chromium has different degrees of pollution on the soil, and the largest amounts of chromium in residue （RES-） was found, while the sum of strongly bond organic matter （OM-） and exchangeable （EX-） was smaller than carbonates （CARB-） and iron-manganese＇s oxide （EX-）. Study of the contents in plant parts conferred the chromium contamination can be subject to a soil-to-root transfer and subsequent translocation to edible organs. The bio-concentration of chromium in different parts of the reeds and the correlation coefficients of chromium in the reeds and contents of different species in soil were also studied, correlation analysis shown that the chromium content in the reeds was positively well correlated with bond organic matter （OM-） content in the soil.
出处
《生态环境》
CSCD
北大核心
2005年第6期835-837,共3页
Ecology and Environmnet
基金
国家自然科学基金项目(50278016)
江苏省科技厅社会发展计划项目(BS2005035)
