| 王东哲,宋静,黄贝童,于泓,李敏敏,和丽萍,骆永明.西南地质高背景区土壤镉释放动力学及辣椒安全阈值研究[J].农业环境科学学报,2024,43(11):2506-2515. |
| 西南地质高背景区土壤镉释放动力学及辣椒安全阈值研究 |
| Kinetics of soil cadmium release and the safe threshold for pepper in a typical area with a high geological background in southwest China |
| 投稿时间：2024-01-23 |
| DOI：10.11654/jaes.2024-0090 |
| 中文关键词: 地质高背景土壤 镉 释放动力学 辣椒 安全阈值 |
| 英文关键词: high-geological-background soil cadmium release kinetics pepper safety threshold |
| 基金项目:科技人才与平台计划项目(院士专家工作站)(202205AF150010) |
| 作者 | 单位 | E-mail | | 王东哲 | 中国科学院南京土壤研究所, 南京 210008
中国科学院大学, 北京 100049 | | | 宋静 | 中国科学院南京土壤研究所, 南京 210008
中国科学院大学南京学院, 南京 211135 | | | 黄贝童 | 中国科学院南京土壤研究所, 南京 210008 | | | 于泓 | 云南省生态环境科学研究院, 昆明 650034
云南省重金属污染控制工程技术研究中心, 昆明 650034 | | | 李敏敏 | 云南省生态环境科学研究院, 昆明 650034
云南省重金属污染控制工程技术研究中心, 昆明 650034 | | | 和丽萍 | 云南省生态环境科学研究院, 昆明 650034
云南省重金属污染控制工程技术研究中心, 昆明 650034 | | | 骆永明 | 中国科学院南京土壤研究所, 南京 210008
中国科学院大学, 北京 100049
土壤与农业可持续发展国家重点实验室, 南京 210008 | ymluo@issas.ac.cn |
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| 中文摘要: |
| 为探究西南典型碳酸盐岩地质高背景区农田土壤镉（Cd）的释放动力学特征以及保护辣椒安全生产的土壤Cd阈值，通过梯度扩散薄膜技术（Diffusive gradients in thin-films technique，DGT）和 DIFS 模型（DGT induced fluxes in soils and sediments model）获取土壤Cd释放动力学参数，通过盆栽和大田试验建立了基于土壤总Cd和有效态Cd与辣椒Cd含量的关系，并推导出保护辣椒安全生产的土壤总 Cd 和有效态 Cd 阈值。结果表明：土壤 Cd 从固相向液相释放的能力处于中等到高的水平（R 值范围为 0.42~0.98），较低的土壤pH有利于Cd的长期持续释放。DGT测定的土壤有效态Cd对辣椒Cd的预测效果最佳（模型拟合优度=0.86），土壤总Cd、0.43 mol·L-1 HNO3提取态Cd（HNO3-Cd）和BCR连续提取法第一步提取态Cd（F1-Cd）结合土壤pH能够与辣椒Cd含量建立较好的多元线性回归模型，拟合优度均高于0.80。0.43 mol·L-1 HNO3提取法具有简单快捷、便于检测的优点，其与土壤pH结合可作为研究区碳酸盐岩地质高背景农田土壤有效态Cd的可靠评价方法。研究表明，基于总Cd和HNO3-Cd推导的土壤Cd安全阈值能够较好地保护当地辣椒的安全生产。 |
| 英文摘要: |
| This study aims to investigate the kinetics of cadmium（Cd）release from agricultural soils in a typical area with a high geological background in southwest China, and propose soil Cd thresholds for safe pepper production. The parameters of soil Cd release kinetics were obtained using diffusive gradients in thin-films technique（DGT）and the DGT-induced fluxes in soils and sediments model（DIFS）. Pot and field experiments were conducted to derive the relationships between total and available Cd in soils and Cd in pepper. The soil-plant relationships were then used to derive the threshold value of soil Cd to protect safe pepper production. The results showed that in the study area, the release of Cd from the soil solid phase to the liquid phase was moderate to high（with R-values ranging from 0.42 to 0.98）, and the low-pH condition was favorable for the continuous release of Cd long-term. Compared with traditional chemical extraction methods, the effective Cd concentration measured by DGT was the best predictor of Cd in pepper（R2=0.86）, and total soil Cd, 0.43 mol·L-1 HNO3 extractable Cd, and the first-step-extractable Cd of the BCR sequential extraction method, in combination with soil pH, yielded good multivariate linear regression models to predict Cd in pepper（R2>0.80 in all cases）. The 0.43 mol·L-1 HNO3 extraction method had the advantage of being quick and easy, and combined with soil pH could serve as a reliable index to predict available Cd in carbonate-rock high-geological-background farmland in the study area. Validation with field data shows that the existing soil screening value for Cd is conservative for the study area, and that the total and HNO3-extraction-based Cd thresholds derived in this study can better protect the safe production of local pepper. |
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