National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources, Hunan Agricultural University, Hunan, 410128, China.
National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Resources, Hunan Agricultural University, Hunan, 410128, China.
Environ Pollut. 2024 May 1;348:123196. doi: 10.1016/j.envpol.2023.123196. Epub 2023 Dec 23.
Selenium (Se) accumulation in rice (Oryza sativa L.) has become a major global concern. Se offers multiple health benefits in humans; however, its inadequate or excessive intake can be harmful. Therefore, determining the factors driving Se abundance and bioavailability in paddy soils is essential to ensure the safety of human Se intake. This study investigated the accumulation, bioavailability, and distribution of Se in 820 paddy soil and rice grain samples from Luxi County, China to assess how soil properties (soil organic matter [SOM], cation exchange capacity [CEC], and pH), geographical factors (parent materials, elevation, and mean annual precipitation [MAP] and temperature [MAT]), and essential micronutrients (copper [Cu], zinc [Zn], and manganese [Mn]) govern Se accumulation and bioavailability in paddy soils. Results showed that the average soil Se content was 0.36 mg kg, which was higher than that in China (0.29 mg kg). Alternatively, the average rice grain Se content was 0.032 mg kg, which was lower than the minimum allowable content in Se-rich rice grains (0.04 mg kg). Five studied parent materials all had a significant effect on soil Se content but had little effect on Se bioavailability (p < 0.05). CEC, elevation, and SOM, as well as the soil contents of Cu, Zn, and Mn were positively correlated with soil Se content, but pH, MAP, and MAT were negatively correlated. Correspondingly, Se bioavailability was negatively correlated with SOM and soil Zn content, but positively correlated with MAP and grain contents of Cu, Zn, and Mn. Furthermore, partial least squares path analysis revealed the interactive impacts of the influencing factors on Se accumulation and bioavailability in soils. On this basis, prediction models were established to predict Se accumulation and bioavailability in paddy soils, thereby providing theoretical support for developing efficient control measures to meet Se challenges in agriculture.
硒（Se）在水稻（Oryza sativa L.）中的积累已成为一个全球性的主要关注点。Se 为人类提供了多种健康益处；然而，其摄入不足或过量都可能有害。因此，确定驱动稻田土壤中硒丰度和生物有效性的因素对于确保人类摄入硒的安全性至关重要。本研究调查了中国鹿邑县 820 个稻田土壤和水稻籽粒样本中硒的积累、生物有效性和分布，以评估土壤性质（土壤有机质[SOM]、阳离子交换容量[CEC]和 pH）、地理因素（母质、海拔、年平均降水量[MAP]和温度[MAT]）以及必需微量元素（铜[Cu]、锌[Zn]和锰[Mn]）如何控制稻田土壤中硒的积累和生物有效性。结果表明，土壤硒含量的平均值为 0.36mg/kg，高于中国的平均值（0.29mg/kg）。相反，水稻籽粒硒含量的平均值为 0.032mg/kg，低于富硒水稻籽粒的最低允许含量（0.04mg/kg）。五种研究的母质均对土壤硒含量有显著影响，但对硒生物有效性影响较小（p<0.05）。CEC、海拔和 SOM 以及土壤 Cu、Zn 和 Mn 含量与土壤硒含量呈正相关，而 pH、MAP 和 MAT 则呈负相关。相应地，硒生物有效性与 SOM 和土壤 Zn 含量呈负相关，与 MAP 和籽粒 Cu、Zn 和 Mn 含量呈正相关。此外，偏最小二乘路径分析揭示了影响因素对土壤中硒积累和生物有效性的相互作用影响。在此基础上，建立了预测模型来预测稻田土壤中硒的积累和生物有效性，为制定有效的控制措施以应对农业中的硒挑战提供了理论支持。
