| 张家口市北新屯地区蔬菜种植区锗元素富集特征及成因分析 |
| 摘要点击 1232 全文点击 457 投稿时间：2022-05-05 修订日期：2022-06-21 |
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| 中文关键词 张家口地区 锗(Ge) 稀土元素(REE) 冗余分析(RDA) 迁移路径 |
| 英文关键词 Zhangjiakou area germanium(Ge) rare earth elements(REE) redundancy analysis(RDA) migration pathways |
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| 中文摘要 |
| 选取张家口市北新屯地区蔬菜种植基地为研究区，分为重点区和区域范围以及上游地区，共采集表层土壤样品132件，垂向土壤剖面16条，地表剖面3组，彩椒果实、紫甘蓝果实和玉米果实样品各4件，在分析土壤、岩石和作物样品的Sc、Cr、Mo、Cd、V、Zn、Sr、Pb、Co、Ni、Cu、Ge和REE等元素基础上，通过所参照的锗富集标准，发现区域富锗率不高（19.7%），而重点区富锗率较高（52%）.区域范围和重点区土壤中Ge与稀土元素呈现较为明显的空间分布一致性，进一步对比土壤与作物中Ge和稀土元素相关性特征发现，稀土含量排序为：紫甘蓝>彩椒>玉米，而Ge吸收强度排序为：玉米（微弱吸收）>紫甘蓝（极弱吸收）>彩椒（极弱吸收），作物对Ge和稀土元素的吸收并没有明显的协同性.通过对研究区土壤28种元素和指标的PMF和RDA分析表明，区域Ge的来源以天然地质背景因素为主（66.3%），人为活动影响因素（27%）和大气干湿沉降因素（6.7%）为辅，重点区Ge的来源以天然地质背景因素（33.8%）和人为活动影响因素（27.2%）为主，大气干湿沉降因素（18.5%）和河流沉积因素（20.5%）为辅，土壤Ge均与稀土元素和Cd、Zn、Mn、Ni、V、Co、Cr等微量元素呈正相关关系，与主量元素Na2 O、SiO2、K2 O和pH呈负相关关系.最后通过将土壤横向剖面与垂向剖面结合分析，发现由物源区迁移至区内的Ge主要以主河道途径为主，次级河道和洪流途径为辅. |
| 英文摘要 |
| The vegetable planting base in the Beixintun area of Zhangjiakou City was selected as the study area, divided into the focus area and regional range as well as the upstream area. A total of 132 surface soil samples, 16 vertical soil profiles, 3 groups of surface profiles, and 4 samples each of colored pepper fruit, purple kale fruit, and corn fruit were collected. From the soil, rock, and crop sample Sc, Cr, Mo, Cd, V, Zn, Sr, Pb, Co Ni, Cu, Ge, and REE on the basis of the referenced germanium (Ge) enrichment standards and enrichment factor levels, it was found that the regional Ge enrichment rate was not high (19.7%), whereas the key area had a high Ge enrichment rate (52%). The spatial distribution of Ge and rare earth elements in the soils of the regional scope and the focal area showed a more obvious consistency, and further comparison of the correlation characteristics of Ge and rare earth elements in soil and crops showed that the ranking of rare earth content was purple kale>colored pepper>maize, whereas the ranking of the Ge element uptake intensity was maize (weak uptake)>purple kale (very weak uptake)>colored pepper (very weak uptake), and there was no obvious synergy between the uptake of Ge and rare earth elements by crops. The PMF and RDA analysis of 28 elements and indicators of soil in the study area showed that the source of regional Ge was dominated by natural geological background factors (66.3%), supplemented by anthropogenic activity-influenced factors (27%) and river deposition factors (6.7%). The source of Ge in the focal area was dominated by natural geological background factors (33.8%) and anthropogenic activity-influenced factors (27.2%), with river sedimentation factors (18.5%) and atmospheric dry and wet deposition factors Ge (20.5%) being supplemented. Soil Ge was positively correlated with rare earth elements and trace elements such as Cd, Zn, Mn, Ni, V, Co, and Cr and negatively correlated with the main elements ČNa2[KG-*2/5]O, SiO2, and K2[KG-*2/5]O and pH. Finally, by combining the analysis of soil lateral profiles with vertical profiles, it was found that the Ge migrating from the source area to the area was primarily in the main river pathway, supplemented by the secondary river and flood flow pathways. |
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