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YANG Jinwei, LIU Qiang, REN Yanbin, DING Xiaoqin, YANG Guifang, ZHANG Songwei, HU Li, ZHANG Di. 2025. Distribution and causes of selenium-rich soil in Lixiahe area of Hai 'an, Jiangsu Province. Geological Bulletin of China, 44(1): 173-184. doi: 10.12097/gbc.2023.10.011
Citation: YANG Jinwei, LIU Qiang, REN Yanbin, DING Xiaoqin, YANG Guifang, ZHANG Songwei, HU Li, ZHANG Di. 2025. Distribution and causes of selenium-rich soil in Lixiahe area of Hai 'an, Jiangsu Province. Geological Bulletin of China, 44(1): 173-184. doi: 10.12097/gbc.2023.10.011
shu

Distribution and causes of selenium-rich soil in Lixiahe area of Hai 'an, Jiangsu Province

  • 1.

    Marine Geological Survey of Jiangsu Province, ECE, Nanjing 210007, Jiangsu, China

  • 2.

    Coastal Caline-alkali Land Ecological Rehabilitation and Sustainable Utilizationment Technology Innovation Center, MNR, Nanjing 210007, Jiangsu, China

  • 3.

    Jiangsu East China Geological Environmental Engineering Co., Ltd., Nanjing 210007, Jiangsu, China

  • 4.

    Hai 'an Natural Resources and Planning Bureau, Nantong 226600, Jiangsu, China

More Information
Received Date:  11 October 2023
Revised Date:  05 December 2023
Publish Date:  15 January 2025
    Abstract
  • Objective

    Recently, the development and utilization of natural selenium−rich land resources have attracted increasing attention. However, the genesis of selenium−rich soil in plain areas far from parent rocks is still unclear. This paper aims to take the Lixiahe area in Hai'an as an example to explore the distribution characteristics and genesis of selenium−rich soil in plain areas, thereby guiding the development and utilization of selenium−rich land resources.

    Methods

    The paper systematically collated geochemical data from 1800 groups of surface soil samples and 1000 groups of soil profile samples in the study area, and combined with previous research data, conducted a comprehensive analysis and study of the data. The grain size characteristics of sediments were used to infer the depositional environment of the parent material.

    Results

    The selenium (Se) content in the surface soil of agricultural land in the study area reaches up to 0.63 mg/kg, and the area of the enrichment zone (≥ 0.3 mg/kg) is 66 km2. In the vertical soil profile, the average Se content in plough layer ( 0~20 cm ), plough pan ( 20~40 cm ), subsoil ( 50~80 cm ), subsoil ( 80~100 cm ) and deep soil ( 150~180 cm ) were 0.23 mg/kg, 0.18 mg/kg, 0.13 mg/kg, 0.12 mg/kg, and 0.11 mg/kg, respectively, showing a very obvious surface accumulation; the selenium content in surface soil was highly positively correlated with the parent material layer, with a correlation coefficient between 0.6 and 0.8 (P<0.01). There was a highly significant negative correlation between ground elevation and soil Se content, with a correlation coefficient of −0.6 (P<0.01), indicating that the higher the terrain, the lower the soil Se content; soil organic matter (SOM) was significantly positively correlated with Se, playing an important role in the adsorption and fixation of selenium during soil formation.

    Conclusions

    The parent material layer was mainly controlled by the ancient lagoon−sand dam sedimentary system. The selenium−rich soil in the area was mainly formed by the supergene enrichment of the parent material developed in the ancient lagoon facies. The lagoon facies sedimentary environment controls the selenium enrichment boundary of the soil. Based on multiple linear regression analysis, the controlling factors of soil selenium enrichment were revealed. Among them, SOM played a decisive role in the enrichment of Se in this area, and the contribution rate to soil Se enrichment was 70%.
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