Elsevier

Ecological Informatics

Volume 66, December 2021, 101420
Ecological Informatics

Modeling analysis of the characteristics of selenium-rich soil in heavy metal high background area and its impact on main crops

https://doi.org/10.1016/j.ecoinf.2021.101420Get rights and content

Highlights

  • Analyze the bioavailability and existence of selenium element.

  • Obtain the classification standard of soil selenium content.

  • LSMM model was established to realize the effective analysis.

  • The analysis shows that variation trend of selenium enrichment rate of crops is consistent.

Abstract

In order to improve the product quality of crops, the characteristics of the selenium-rich soil in the heavy metal high background area and its impact on the main crops are studied. Analyze the bioavailability and existence of selenium element, and obtain the classification standard of soil selenium content. Taking Shitai County in Anhui Province as the research area, soil samples from this area were collected, and the results of the collection were made into a field sampling report. The sampling results were analyzed by statistical methods to obtain the measurement results of the selenium content in the soil of the study area. Finally, the LSMM model was established to realize the effective analysis of the characteristics of selenium-rich soil in the heavy metal high background area. The research results show that under different heavy metal pollution conditions, the growth of corn, rice and soybean crops is different. Generally speaking, heavy metals will restrict the healthy growth of crops; the effect of selenium absorption activity will directly or indirectly affect the growth and development of crops; the selenium enrichment rate of crops shows the characteristics of corn>rice>soybeans.

Introduction

According to relevant research results, the selenium element rich in plants mainly comes from the soil, and the migration path of selenium element is mainly manifested as: soil-crops-agricultural and livestock products. Selenium migrates through this pathway, and finally produces results that affect human health (Ahmed et al., 2019; Gao et al., 2021; Han et al., 2019). Selenium is classified as metalloid in which a component transitional in properties betwixt the metals as well as non-metals. Under normal circumstances, the element's grey, metallic system is the utmost constant. It is necessary for the proper functioning of your immune system. The specified antioxidant helps your body minimise oxidative stress, which diminishes inflammation besides boosts immunity. At present, although the heavy metal high background area has a large number of soil selenium-enriched areas, it is only manifested in the high selenium content, and the plant absorption rate of selenium is not high. Therefore, it is of great significance to study the characteristics of selenium-rich soil and its impact on crops (Hamsa and Nagabovanalli, 2020; Sharma et al., 2019). The antioxidative characteristics of selenium, as well as its role in thyroid hormone metabolism control, are two of its most important activities. Selenium is an essential nutrient, then the Committee on Dietary Allowances of the US Food and Nutrition Board has advised a daily intake of 50–200 micrograms, which may be rather arbitrary.

In order to enhance the role of selenium-rich soil, related researchers and experts in the agricultural field have conducted a lot of research on the characteristics and effects of selenium-rich soil. Reference (An et al., 2020) took the southern area of Fangshan, Beijing as the research area, and conducted an in-depth study on the biological characteristics of the selenium-rich soil and the source of selenium in this area. According to the soil geological survey data published in recent years, the soil is classified. According to the classification results, it can be known that the content of organic matter and heavy metal elements in the soil has a high correlation with the selenium content in the soil, and the pH content of the soil is low. According to the survey results of the crops in the region, it can be seen that wheat crops have the strongest selenium-enrichment capacity, followed by corn. It can be seen that these two crops are the best choices for increasing the added value of agricultural products. Further analysis of the vertical distribution characteristics of the soil selenium content shows that the farther the distance from the mountain front is, the higher the proportion of the effective selenium element and the lower the proportion of the difficult-to-migrate state. A comprehensive analysis of the research results shows that the selenium element in the selenium-rich soil mainly comes from the coal-measure strata in the study area. Reference (Nie et al., 2021) takes the central and southern part of Guangxi Guangxi as the research area to study the physical and chemical characteristics and content of selenium-rich soil in this area. In this research, paddy fields and dry fields are the main research objects, and the selenium-rich soil is analyzed. Content and its distribution characteristics, analyze the correlation between selenium and soil properties. Collect soil samples at soil depths of 0-20 cm and 150-200 cm, and determine the selenium content of the samples. The research results show that the content of selenium in the surface soil (0-20 cm) of the study area is 0.75–1.92.97 μg/g−1. According to this value, the surface soil and the selenium-rich soil in the study area can be known; In the deep soil (150-200 cm) of the study area, the selenium content is 0.64–1.52.36 μg/g−1, which is also a selenium-rich soil. The results show that the surface soil and deep soil in the study area belong to selenium rich soil. In addition, through the research results, it can be concluded that the relationship between selenium content and organic carbon is positive correlation, and the relationship between selenium content and pH value is negative correlation (Yu et al., 2021; Zhao et al., 2019). The selenium content of paddy soil is lower than that of upland soil. In conclusion, the soil conditions in the south of Central Guangxi are suitable for planting selenium rich crops. Some researchers have come to the conclusion through investigation that selenium rich soil may not be able to grow selenium rich crops. This is because the soil has a variety of forms, and the main absorption of crops is available state. However, according to the actual soil conditions, the soil with higher selenium content does not necessarily have a high content of available state. At the same time, the water content, pH value and organic matter in the soil are different, and other elements are the influencing factors of soil properties (Zhao, 2019).

In order to promote the healthy growth of crops, this paper takes Shitai County as the research area, collects samples of typical crops in this area: corn, rice and soybean, and determines the samples from multiple perspectives. According to the determination results, the characteristics of selenium rich soil in heavy metal high background area are obtained, and its impact on crops is analyzed, so as to realize the research on the characteristics of soil crop migration and transformation Research. The research results provide the basis for improving the quality of local crop products, and provide scientific data for agricultural research.

Section snippets

Research method ideas

At present, experts and scholars in the industry have classified the selenium content of soil according to the content and distribution characteristics of selenium in the soil, combined with the biological availability and existence of selenium, and formed a relatively complete classification standard for soil selenium content (Chai et al., 2019). At the same time, according to the data provided by the National Environmental Monitoring Station, the average selenium content in soil in my country

Soil geochemical characteristics of heavy metal high background areas

According to investigation and research, the composition of selenium-rich soil is not only rich in selenium, but also contains a variety of trace elements, nutrient elements and organic matter, with more than 30 kinds of elements. Through the research method, the selenium-rich soil in Shitai County is further divided into a whole, and soil samples are sampled in this area, and the statistical results of the abnormal characteristic parameters of the selenium-rich soil in this area are shown in

Conclusion

At this stage, heavy metal pollution in the soil environment is very bad, which not only affects the health of crop eaters, but also affects the economic benefits of farmers, and even the sustainable development of the local economy. Therefore, research on the current soil environment is of great significance to the growth of crops. A macro, rapid, and accurate study of soil problems is needed. At present, traditional methods have initially realized the extraction and determination of the

Declaration of Competing Interest

None.

Acknowledgement

Project supported by Chongqing Municipal Bureau of Planning and Natural Resources Land Quality Survey Project (2020188), and the Research Fund of Applied Nuclear Technology in Geoscience Key Laboratory of Sichuan Province (gnzds202008).

References (32)

  • L.F. Chai et al.

    Selenium contents and their relationship with Main soil properties in farmland soils of southern Guizhong, Guanxi

    Chin. J. Soil Sci.

    (2019)
  • X. Chi et al.

    Study of photoluminescence characteristics of CdSe quantum dots hybridized with Cu nanowires

    Luminescence

    (2016)
  • Debashree Devi

    A boosting-aided adaptive cluster-based Undersampling approach for treatment of class imbalance problem

    Int. J. Data Warehousing Min.

    (2020)
  • W. Gao et al.

    Discrimination of heavy metal crop contamination using measurements of leaf spectra

    Rem. Sens. Lett.

    (2021)
  • N. Hamsa et al.

    Heavy metal contamination in soils and crops irrigated with lakes of Bengaluru

    Curr. Sci.

    (2020)
  • Z. Han et al.

    Pollution assessment of heavy metals in soils and plants around a molybdenum mine in Central China

    Pol. J. Environ. Stud.

    (2019)
  • Cited by (12)

    • Assessment of heavy metals should be performed before the development of the selenium-rich soil: A case study in China

      2022, Environmental Research
      Citation Excerpt :

      Enrichment of heavy metals in the soils can severely threaten human health through direct inhalation, skin absorption or crops ingestion. Therefore, the development of Se-rich soil will inevitably face the problem from heavy metals, which may be digested by the human body through the food chain, causing health issues (Vasseghian et al., 2022; Xie et al., 2021; Zhang et al., 2020). In 2015, the China Geological Survey documented that the Se-rich soils were all contaminated at different degrees (CGS, 2015).

    View all citing articles on Scopus
    View full text