| 典型地质高背景区土壤硒-镉迁移累积特征及其生物有效性 |
| 摘要点击 2365 全文点击 380 投稿时间：2023-09-04 修订日期：2023-11-02 |
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| 中文关键词 硒-镉（Se-Cd） 土壤-作物系统 生物有效性 拮抗作用 地质高背景 |
| 英文关键词 selenium-cadmium（Se-Cd） soil-crop system bioeffectiveness antagonism geological high background |
| 作者 | 单位 | E-mail | | 周亚龙 | 中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000
中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000
中国地质科学院地球表层碳-汞地球化学循环重点实验室, 廊坊 065000 | zyalong@mail.cgs.gov.cn | | 彭敏 | 中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000
中国地质调查局土地质量地球化学调查评价研究中心, 廊坊 065000
中国地质科学院地球表层碳-汞地球化学循环重点实验室, 廊坊 065000 | pmin@mail.cgs.gov.cn | | 杨志斌 | 中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 | | | 陈杰 | 云南省地质调查院, 昆明 650216 | | | 王成文 | 中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 | | | 韩伟 | 中国地质科学院地球物理地球化学勘查研究所, 廊坊 065000 | hanwei@mail.cgs.gov.cn |
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| 中文摘要 |
| 地质高背景区土壤中普遍存在的硒-镉（Se-Cd）共生现象直接影响富Se土地资源的安全利用.为探究西南地质高背景区土壤-作物系统Se-Cd迁移累积特征及生物有效性,实现地质高背景区天然富Se土地资源的安全利用,系统采集分析84件农作物（玉米）及其配套根系土壤样品中Se-Cd含量及理化性质,采用地统计、生物富集因子及地理探测器等分析方法,开展土壤-作物系统中Se-Cd累积特征、影响因素及生物有效性评价.结果表明,研究区土壤Se-Cd含量显著高于全国和云南省土壤背景值,受地质背景、成土过程中次生富集作用和农业活动的影响呈现不同程度的积累富集特征,根系土壤Se地累积指数等级为无富集到轻微富集等级,赋存形态以残渣态为主；土壤Cd地累积指数等级以中度污染等级为主,赋存形态以残渣态和铁锰结合态为主.作物籽实富Se率达98.8%（DB 50/T 524-2013）,生物富集因子均值为5.8%；作物籽实Cd含量超标率仅1.19%（GB 2762-2022）,Cd生物富集因子平均值为2.11%,作物籽粒Cd的生态风险相对较低.地质背景成因的Se-Cd共生区,土壤弱碱性环境能有效降低区内作物籽实Cd的生物有效性,土壤富Se对于作物吸收Cd有一定抑制效果.相关分析显示,土壤-作物系统中Se和Cd从土壤向作物籽实的迁移累积受元素赋存形态和土壤理化性质（pH）等因素的影响,同时,土壤-作物系统中Se与Cd相互之间也存在一定的拮抗作用. |
| 英文摘要 |
| The prevalence of selenium-cadmium （Se-Cd） symbiosis in soils of geologically high background areas directly affects the safe utilization of Se-rich land resources. To investigate the migration and accumulation characteristics and bio-effectiveness of Se-Cd in the soil-crop system in typical geological high background areas of Southwest China and to realize the safe use of natural Se-rich land resources in geological high background areas, we collected 84 samples of agricultural crops （maize） and their supporting root systems and analyzed the Se-Cd content and physicochemical properties. Se-Cd accumulation characteristics, influencing factors, and bio-effectiveness of the soil-crop system were evaluated using geostatistics, bioenrichment factors, and geographic detectors. The results showed that the Se-Cd content in the study area was significantly higher than the background value of the soil in the whole country and in Yunnan Province. Influenced by the geological background, secondary enrichment in the process of soil formation, and agricultural activities, the accumulation and enrichment characteristics of Se in the root soil varied from no enrichment to slightly enriched, and the occurrence form was dominated by the residue state. The accumulation index of soil Cd was mainly in the medium pollution level, and the occurrence form was mainly in the residual state and the combined state of iron and manganese. The Se-enrichment rate of crop seeds reached 98.8% （DB 50/T 524-2013 standard）, and the average value of bioconcentration factor was 5.8%. The exceeding rate of Cd content in crop seeds was only 1.19% （GB 2762-2022 standard）, and the average value of Cd bioconcentration factor was 2.11%, so the ecological risk of heavy metal Cd in crop seeds was relatively low. In the Se-Cd symbiosis area under geological background, the weak alkaline environment of the soil could effectively reduce the bioavailability of Cd in crop seeds, and the Se-rich soil could inhibit the uptake of Cd by the crops to a certain extent. Correlation analysis showed that the migration and accumulation of Se and Cd from soil to crop seeds in the soil-crop system were affected by the elemental accumulation pattern and the physical and chemical properties （pH） of the soil, and at the same time, there was a certain synergistic-antagonistic effect between Se and Cd in the soil-crop system. Correlation analysis showed that the migration and accumulation of Se and Cd from soil to crop seeds in the soil-crop system was influenced by the occurrence of elements, soil physicochemical properties （pH）, and other factors, and there was also a certain synergistic-antagonistic interaction between Se and Cd in the soil-crop system. |
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