College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, People's Republic of China.
Key Laboratory of Land Surface Pattern and Simulation, Beijing Key Laboratory of Environmental Damage Assessment and Remediation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences (CAS), 11A, Datun Road, Chaoyang District, Beijing, 100101, People's Republic of China.
Environ Geochem Health. 2020 Feb;42(2):377-388. doi: 10.1007/s10653-019-00365-9. Epub 2019 Jul 8.
A number of remediation measures have been used in paddy fields to alleviate serious cadmium (Cd) contamination, which may pose a public health risk through the food chain. In this study, a field trial was conducted in paddy fields with slight-moderate Cd contamination to investigate the remediation effects of combined remediation measures (CRMs), including the use of Cd-safe rice (Oryza sativa L.) cultivars, water management modes (WMMs), lime application (LA), soil amendment application (SAA), and foliar silicon (Si) fertilizers. Two groups of field trials were designed including CRMs with selenium (Se) and without selenium (non-Se) application. The results show that soil measures (LA + SAA) can increase the soil pH by 0.99 and decrease the soil DTPA-extracted Cd content by 34.19% (p < 0.05). All measures used in the present study significantly decreased the Cd content in husked rice and yield, except for the WMMs; the CRMs achieved the best results, and Se application enhanced the effects of all measures. This study shows that CRMs significantly decreased the Cd content in husked rice by 58.10%; this value increased to 72.69% after Se application (p < 0.05). These results provide useful information for selecting remediation measures in paddy fields with slight-moderate Cd contamination.
采取了多种修复措施来缓解稻田中严重的镉（Cd）污染，这些污染可能通过食物链对公众健康构成风险。本研究在轻度-中度 Cd 污染的稻田中进行了田间试验，以研究联合修复措施（CRMs）的修复效果，包括使用 Cd 安全水稻（Oryza sativa L.）品种、水分管理模式（WMMs）、石灰施用（LA）、土壤改良剂施用（SAA）和叶面硅肥（Si）。设计了两组田间试验，包括施用硒（Se）和不施用硒（非-Se）的 CRMs。结果表明，土壤措施（LA+SAA）可将土壤 pH 值提高 0.99，将土壤 DTPA 提取的 Cd 含量降低 34.19%（p<0.05）。本研究中使用的所有措施都显著降低了糙米和产量中的 Cd 含量，除了 WMMs；CRMs 取得了最佳效果，并且施用 Se 增强了所有措施的效果。本研究表明，CRMs 可显著降低糙米中的 Cd 含量 58.10%；施用 Se 后，这一数值增加到 72.69%（p<0.05）。这些结果为选择轻度-中度 Cd 污染稻田的修复措施提供了有用信息。
