| 陕西省典型高硒土壤的空间分布及主要农作物硒的含量特征和主要来源研究 |
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| 引用本文： | 郝栗涛,张湜溪,雒昆利.陕西省典型高硒土壤的空间分布及主要农作物硒的含量特征和主要来源研究[J].环境科学研究,2023,36(5):1032-1041. |
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| 作者姓名： | 郝栗涛 张湜溪 雒昆利 |
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| 作者单位： | 1.中国科学院地理科学与资源研究所，北京 100101 |
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| 基金项目： | 国家自然科学基金项目(No.42007283)；中国富硒产业研究院富硒专项研发计划(No.2019ZKG-4-01)；岚皋县天然硒资源普查项目 |
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| 摘 要： | 为研究陕西省安康市富硒核心区—岚皋县高硒土壤的空间分布及主要农作物硒含量特征和主要来源，本文在岚皋县采集了767个表层土壤样品，其中在高硒区(佐龙镇和民主镇)按行政村地块为单元，共加密采集了409个土样以及18个土豆、35个玉米和14个基岩样品，测试了其总硒含量.结果表明：(1)岚皋县北部典型高硒区—佐龙镇和民主镇的土壤硒含量平均值分别为3.38 mg/kg (范围为0.02～37.39 mg/kg)和3.11 mg/kg (范围为0.05～16.96 mg/kg)，均远高于中国(0.29 mg/kg)和全球(0.40mg/kg)表层土壤硒含量的背景值.(2)佐龙镇和民主镇表层土壤硒含量大于0.40 mg/kg的面积分别占各自乡镇面积的99.18%和75.79%.(3)佐龙镇中部地区的硒含量较高，民主镇中部和东南部地区的硒含量较高.高硒区的土豆(硒含量范围为0.04～1.78 mg/kg，平均值为0.49 mg/kg)和玉米(硒含量范围为0.01～2.82 mg/kg，平均值为0.69 mg/kg)的富硒率均超过68%.(4)高硒区土壤富硒的最主要原因是晚前寒武纪—寒武纪的富硒地层大面...
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| 关 键 词： | 岚皋县 高硒区 表层土壤 空间分布 农作物 硒含量 |
| 收稿时间： | 2022-11-15 |
Study on Spatial Distribution of Typical High-Selenium Soil and Content Characteristics and Main Sources of Selenium in Main Crops in Shaanxi Province |
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| Affiliation: | 1.Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China2.Chinese Academy of Se-Enriched Industry, Ankang 725000, China3.College of New Energy and Environment, Jilin University, Changchun 130012, China4.School of Geosciences and Surveying Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China |
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| Abstract: | In order to study the spatial distribution of high-selenium soil and content characteristics and main sources of selenium in main crops in Langao County, the selenium-rich core area of Ankang, Shaanxi Province, 767 surface soil samples were collected from Langao County. In the high-selenium areas (Zuolong Town and Minzhu Town), 409 surface soil samples, 18 potato samples, 35 corn samples and 14 bedrock samples were collected according to the administrative village. The contents of selenium were measured in the collected samples. The results showed the average soil selenium content in the soil of Zuolong and Minzhu Towns in northern Langao County was 3.38 mg/kg (0.02-37.39 mg/kg) and 3.11 mg/kg (0.05-16.96 mg/kg), respectively, which were much higher than the background values of soil selenium content in China (0.29 mg/kg) and the world (0.40 mg/kg). The selenium content above 0.40 mg/kg in the surface soil of Zuolong Town and Minzhu Town accounted for 99.18% and 75.79% of the township area, respectively. Soil in the central part of Zuolong Town, and the central and southeastern parts of Minzhu Town had higher content of selenium. The selenium enrichment rates of potatoes (0.04-1.78 mg/kg, mean 0.49 mg/kg) and corns (0.01-2.82 mg/kg, mean 0.69 mg/kg) in the high-selenium area were both above 68%. The main reason for selenium enrichment in soil of high-selenium area was that the selenium-enriched strata in the Late Precambrian-Cambrian were exposed in a large area, resulting in a higher selenium content in the overlying soil formed by weathering. The selenium content of the main crops in the high-selenium area was closely related to the selenium content of bedrock in the distribution area. The research showed selenium content of surface soils and crops in northern Langao County was mainly derived from the selenium rich strata in the distribution area. |
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