Content Characteristics and Influencing Factors of Soil Selenium in Western Muchuan County, Sichuan Province

CHENG Xiao-meng; SUN Bin-bin; HE Ling; WU Chao; ZHAO Chen; ZENG Dao-ming

doi:10.15898/j.cnki.11-2131/td.202106080072

Rock and Mineral Analysis > 2021 > 40(6): 808-819. > DOI: 10.15898/j.cnki.11-2131/td.202106080072

CHENG Xiao-meng, SUN Bin-bin, HE Ling, WU Chao, ZHAO Chen, ZENG Dao-ming. Content Characteristics and Influencing Factors of Soil Selenium in Western Muchuan County, Sichuan Province[J]. Rock and Mineral Analysis, 2021, 40(6): 808-819. DOI: 10.15898/j.cnki.11-2131/td.202106080072

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Content Characteristics and Influencing Factors of Soil Selenium in Western Muchuan County, Sichuan Province

CHENG Xiao-meng^1,2,3,,
SUN Bin-bin^1,2,3,
HE Ling^1,2,3, ,,
WU Chao^1,2,3,
ZHAO Chen^1,3,
ZENG Dao-ming^1,2,3

1.
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
2.
International Center on Global Scale Geochemistry, UNESCO, Langfang 065000, China
3.
Research Center of Geochemical Survey and Assessment of Land Quality, China Geological Survey, Langfang 065000, China

More Information

Received Date: June 07, 2021
Revised Date: June 30, 2021
Accepted Date: August 27, 2021
Published Date: November 27, 2021

Abstract

HIGHLIGHTS
(1) The selenium-rich land covers 112km², including 35km² nuisanceless selenium-rich land. The selenium-rich land resources are abundant in the study area.

(2) The geological background is closely related to the soil selenium contents, which is mainly controlled by carbonate rocks, sandstone and siltstone intercalated with carbonaceous strata.

(3) Soil pH, organic matter, TFe₂O₃, S and weathering degree are important factors affecting the enrichment and activation of soil selenium. The effect of organic matter on soil selenium is significantly greater than TFe₂O₃.

ABSTRACT

BACKGROUNDSelenium (Se) is an essential beneficial trace element for human and animals; taking an appropriate amount of selenium is an important sign to improve the quality of life. Eating selenium-rich agricultural products is an important way for humans to obtain and supplement selenium in low-Se regions. Investigating the content characteristics of soil selenium, delineating the distribution of selenium-enriched soil resources and identifying the influencing factors of soil selenium migration and enrichment can provide a sound basis for the efficient utilization of selenium-enriched soil resources and scientific development of selenium-enriched agricultural products.
OBJECTIVESTo reveal the content, distribution characteristics and influencing factors of selenium in soils from the study area.
METHODSSoil samples were collected from the western area of Muchuan County, Sichuan Province. AFS, ICP-MS and XRF were used to determine the elemental content (Se, Al₂O₃, TFe₂O₃, OrgC, Cd) and pH values. The content, distribution and influencing factors of soil selenium in the study area were evaluated using statistical and correlation analysis.
RESULTSThe results showed that: (1) The content of selenium in the study area ranged from 0.08 to 1.30mg/kg, with an average value of 0.39±0.15mg/kg. The selenium-rich land was 112km², accounting for 52% of the total area, of which the nuisanceless selenium-rich land was 35km². Soil Cd content was the main factor causing the great difference between selenium-enrich soil and nuisanceless selenium-rich soil. (2) The geological background was closely related to the soil selenium content, which was mainly controlled by carbonate rocks, sandstone and siltstone intercalated with carbonaceous strata. The source of soil selenium was stable. (3) The soil selenium content decreased with pH and ba value, meanwhile, they increased with TFe₂O₃ and S content. The effect of organic matter on soil selenium was significantly greater than TFe₂O₃, indicating that the adsorption capacity of TFe₂O₃ for selenium in this area was lower than organic matter.
CONCLUSIONSSelenium-enriched land resources are abundant in the study area. The content of soil selenium is affected by geological background and physical and chemical properties. It is suggested that local governments make full use of relevant resources to develop selenium-enriched agricultural products. At the same time, attention should be paid to the balanced fertilization of organic fertilizers. The collaborative analysis of factors affecting the migration and enrichment of selenium in the soil-crop system should be further strengthened.

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