School of Earth Sciences and Resources, China University of Geosciences, No. 29, Xueyuan Road, Haidian District, 100083, Beijing, China,
Environ Sci Pollut Res Int. 2014;21(13):7876-85. doi: 10.1007/s11356-014-2679-0. Epub 2014 Mar 20.
The accumulation of heavy metals in farmland has become an important issue related to food security and environmental risk. The annual inputs of heavy metals (As, Cd, Hg, Pb, Cr, Cu, and Zn) to agricultural soil for a full year in Hainan Island have been studied. Three fluxes through the cultivated horizon were considered: (1) atmospheric depositions, (2) fertilization, and (3) irrigation water. The corresponding samples were collected and analyzed on a large regional scale. The total input fluxes show obvious spatial variability among different regions. The inventory of heavy metal inputs to agricultural land demonstrates that agricultural soil is potentially at risk of heavy metal accumulation from irrigation water. The potential at risk of heavy metal accumulation from atmospheric deposition and fertilizer is relatively low compared to irrigation. The results indicate that Hg is the element of prior concern for agricultural soil, followed by Cd and As, and other heavy metal elements represent little threat to the environment in the study area. This work provides baseline information to develop policies to control and reduce toxic elements accumulated in agricultural soil.
农田重金属积累已成为与食品安全和环境风险相关的重要问题。本研究对海南岛全年农业土壤中重金属（As、Cd、Hg、Pb、Cr、Cu 和 Zn）的输入情况进行了研究。通过耕作层考虑了三种通量：（1）大气沉降，（2）施肥，（3）灌溉水。相应的样本在大区域范围内进行了收集和分析。总输入通量显示出不同区域之间明显的空间变异性。农业用地重金属输入的清单表明，农业土壤可能面临灌溉水重金属积累的风险。与灌溉相比，大气沉降和肥料输入导致重金属积累的潜在风险相对较低。结果表明，Hg 是农业土壤中首要关注的元素，其次是 Cd 和 As，其他重金属元素对研究区域的环境威胁较小。这项工作为制定控制和减少农业土壤中有毒元素积累的政策提供了基础信息。
