Distribution Characteristics and Sources Identification of Selenium-rich Soils in the Ecological Conservation Area of the Daqinghe River Watershed, Beijing

FENG Hui; ZHANG Xue-jun; ZHANG Qun; DU Li-na

doi:10.15898/j.cnki.11-2131/td.201905270071

Rock and Mineral Analysis > 2019 > 38(6): 693-704. > DOI: 10.15898/j.cnki.11-2131/td.201905270071

FENG Hui, ZHANG Xue-jun, ZHANG Qun, DU Li-na. Distribution Characteristics and Sources Identification of Selenium-rich Soils in the Ecological Conservation Area of the Daqinghe River Watershed, Beijing[J]. Rock and Mineral Analysis, 2019, 38(6): 693-704. DOI: 10.15898/j.cnki.11-2131/td.201905270071

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Distribution Characteristics and Sources Identification of Selenium-rich Soils in the Ecological Conservation Area of the Daqinghe River Watershed, Beijing

1.
Beijing Institute of Geo-Exploration Technology, Beijing 100120, China
2.
Chinese Academy of Geological Sciences, Beijing 100037, China

More Information

Received Date: May 26, 2019
Revised Date: June 17, 2019
Accepted Date: July 15, 2019
Published Date: October 31, 2019

Abstract

HIGHLIGHTS
(1) A selenium-rich land resource of 360.4km² was identified in the eco-conserving division of the Daqinghe River watershed (1615km²) in Beijing.

(2) Geological background and soil parent material were the key control factors affecting the distribution of selenium-rich land resources.

(3) The environmental safety quality of selenium-rich soil resources was assessed.

ABSTRACT

BACKGROUNDBeijing is a typical geographical distribution area of selenium deficiency. However, some research results in recent years indicate that the soils in some areas reaches the level of selenium enrichment. It is important to study the characteristics of selenium distribution in these areas for the research of a selenium-rich environment in Beijing and the development of selenium-rich land resources.
OBJECTIVESTo discuss the characteristics of selenium content in soil and crops, the source of selenium and the relationship between selenium in soil and other elements such as carbon, iron and phosphorus, and to evaluate the safety of selenium-rich land.
METHODSSamples of 1297 topsoil, 25 sets of corn and corresponding root soil and 15 rock samples were collected from an eco-conserving division of the Daqinghe River watershed. The content of selenium in these samples was determined by atomic fluorescence spectrometry. Methods of correlation analysis and multivariate statistical analysis and GIS technology were used to study the characteristics of selenium content in soil and crops, the source of selenium enrichment, and the relationship between soil selenium and other elements such as carbon, nitrogen, phosphorus and sulfur, and the safety of selenium-rich land was evaluated.
RESULTSThe results showed that the soil selenium content ranged from 0.055 to 0.465mg/kg and that the background value was 0.257mg/kg, which show selenium-rich characteristics. 360.4km² selenium-rich land resources was identified. The selenium content of corn ranged from 0.028 to 0.70mg/kg, and the geometric mean was 0.20mg/kg. 80% of the corn samples were selenium-rich products. The selenium-rich soil and the selenium-rich crops had the same spatial distribution, which indicated that the soil was an important source of selenium in crops.
CONCLUSIONSGeological background and soil parent material are the key control factors affecting the distribution of selenium-rich land resources. Dark rock series of fluvial deposition are a crucial source of selenium in soil. The overall environmental quality of selenium-rich land is clean and safe, and only 0.2% of the area (3.23km²) contains soil heavy metal (Cd, Hg, Pb) content, which exceeds the level of risk management control. Due to these findings, attention needs to be paid during selenium-rich land development.
- selenium-rich soil,
- rock,
- selenium-rich crop,
- eco-conserving division,
- distribution characteristics,
- atomic fluorescence spectrometry

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Distribution Characteristics and Sources Identification of Selenium-rich Soils in the Ecological Conservation Area of the Daqinghe River Watershed, Beijing

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