生态环境学报2016，Vol.25Issue(6)：1039-1046,8.DOI:10.16258/j.cnki.1674-5906.2016.06.018
有色金属矿区农田土壤-水稻镉积累状况及其响应关系研究
Cadmium Accumulation in Paddy Soil-rice System and Their Response Relationship in Non-ferrous Metal Mine Area
摘要
Abstract
Hechi City is in the upper reaches of Xijiang River, which is the most famous town of non-ferrous metals in China. The ecological environment is suffering serious heavy metals pollution due to long-term mining, smelting, processing and industrialization. In order to assess the impact of mining activities on soil and quality and safety of brown rice in the main regions of the upper-middle reaches of Xijiang River draining in Guangxi province, soil samples and corresponding rice samples were collected from study area. According to the Environmental Quality Evaluation Standards for Edible Agricultural Products (HJ332—2006), the exceed standard rates of Cd contents in soil were 90.63%, 96.97%, 98.36% when soil pH<6.5, 6.50≤pH≤7.50, and pH>7.5, respectively. According to the Food Contaminants MRLs Standards (GB2762—2012), the over standard rate of Cd content in brown rice was 19.34%. The single-factor evaluation showed that more than 50%of soil samples were severely polluted by Cd, and only 10%of soil samples contained Cd were in a clean level. Cd pollution in soil-rice system was more serious in the upper reaches of Xijiang River. Quantificational relationships were developed respectively for testing and quantifying the relations among Cd concentration in soil and bioconcentration factors (BCF) of Cd in brown rice with the soil available Cd concentration, soil pH and organic matters (SOM,%). The fitting degrees of the model were higher than 50%. Results showed that multiple nonlinear regression was better to predict Cd contents in brown rice, while multiple linear regression was ideal to predict BCF of Cd. At the same time, the regression and residue analysis showed a good correlation with the computed and measured Cd concentration in rice grain which corresponded with a small and uniformly distributed residual, and this reveals the model used for the preliminary prediction of the Cd concentration in brown rice grains is reliable and reasonable to a certain extent. Research on the accumulation characteristics and responses of heavy metals in soil-rice system would be a practical significance for guiding practice production.关键词
土壤/水稻糙米/Cd/响应关系/预测模型Key words
soil/brown rice/cadmium/response relationship/prediction model分类
资源环境引用本文复制引用
季梦兰,严俊,林华,张学洪,李海翔..有色金属矿区农田土壤-水稻镉积累状况及其响应关系研究[J].生态环境学报,2016,25(6):1039-1046,8.基金项目
广西自然科学基金项目（2013GXNSFBA019208）；“八桂学者”建设工程专项 （）
