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Geoscience ›› 2022, Vol. 36 ›› Issue (03): 953-962.DOI: 10.19657/j.geoscience.1000-8527.2022.03.15

• Geochemistry • Previous Articles     Next Articles

Distribution,Sources and Ecological Effects of Selenium in Topsoil of Cultivated Land in Jiande City, Zhejiang Province

LIU Jian(), WANG Yifan, LIN Zhongyang, PAN Shaojun   

  1. Zhejiang Institute of Geological Survey, Hangzhou, Zhejiang 311203, China
  • Received:2021-01-07 Revised:2021-10-18 Online:2022-06-10 Published:2022-07-19

Abstract:

Selenium is one of the important life elements, which is of great significance to animal and human health. In this paper, we systematically summarized the geochemical characteristics of selenium in topsoil of cultivated land, and analyzed the distribution law of selenium in soil and the genetic relationship between selenium and black rock series. We also discussed the selenium enrichment mechanism in black rock series, and studied the selenium enrichment law in rice plants. We hope that these studies are helpful to reveal the source and ecological effect of selenium in soil of Jiande City. Our results show that the selenium content in topsoil of cultivated land in Jiande City ranges from 0.06 to 11.5 mg/kg, with an average of 0.35 mg/kg. The difference of selenium content in soil is very significant in different geological background, soil parent materials and soil types. In our study aera, 2,647 hectare of clean selenium-rich soils were delineated according to the content of selenium and heavy metals in the soil. Selenium-rich soils are mainly distributed in Cambrian limestone, carbonaceous shale, calcareous mudstone, indicating that the enrichment of selenium in the soil is closely related to the Cambrian “black rock series”. Paleosedimentology research shows that the black rock series were formed in the sedimentary environment of anoxic stagnant water. The organic-rich submarine sediments adsorbed a large amount of selenium from the mantle. After the consolidation and diagenesis, the black rock series which are rich in selenium and other elements were formed. The morphological characteristics of selenium in rice root soil in this study area show that the proportion of acetic acid soluble selenium is relatively small, while the proportion of residual selenium is relatively large, indicating that the availability of selenium in rice root soil is low. The selenium contents in rice, lotus seed and strawberry show that rice has the highest selenium enrichment coefficient, and the selenium content in rice plants was characterized by root > leaf > stem ≈ seed.

Key words: selenium, black rock series, ecological effects, Jiande City

CLC Number: