State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Jiaxing Academy of Agricultural Sciences, Xiuzhou District, Jiaxing 314016, China.
J Hazard Mater. 2021 Jun 15;412:125131. doi: 10.1016/j.jhazmat.2021.125131. Epub 2021 Jan 14.
Arsenic (As) is a well-known human carcinogen, and rice consumption is the main way Chinese people are exposed to As. In this study, 14 kinds of paddy soils were collected from the main rice-producing areas in China. The results showed that rice roots and leaves accumulated more As than stems and grains in the following sequence: As> As> As> As. The accumulation of As by rice grains mainly depends on the total As and bioavailable As (0.43 mol/L HNO extractable As), which explained 32.2% and 22.2% of the variation in the grain As, respectively. In addition, soil pH, organic matter (OM) and clay contents were the major factors affecting grain As, explaining 13.1%, 7.9% and 5.3% of the variation, respectively. An effective prediction model was established via multiple linear regression as As= 0.024 BAs - 0.225 pH+ 0.013 OM+ 0.648 EC - 0.320 TN - 0.088 TP - 0.002 AS+ 2.157 (R =0.68, P < 0.01). Through the verification of the samples from both pot experiments and paddy fields, the model successfully provided accurate predictions for rice grain As.
砷（As）是一种众所周知的人类致癌物，而食用大米是中国人接触砷的主要途径。本研究采集了中国主要水稻产区的 14 种稻田土壤。结果表明，水稻根系和叶片对 As 的积累量大于茎和籽粒，其积累顺序为：As>As>As>As。水稻籽粒中 As 的积累主要取决于总 As 和生物可利用态 As（0.43 mol/L HNO3 可提取态 As），分别解释了籽粒 As 变化的 32.2%和 22.2%。此外，土壤 pH 值、有机质（OM）和粘粒含量是影响籽粒 As 的主要因素，分别解释了 13.1%、7.9%和 5.3%的变化。通过多元线性回归建立了一个有效的预测模型，As=0.024 BAs-0.225 pH+0.013 OM+0.648 EC-0.320 TN-0.088 TP-0.002 AS+2.157（R=0.68，P<0.01）。通过盆栽实验和田间试验样本的验证，该模型成功地对水稻籽粒 As 进行了准确预测。
