青藏高原北缘硒背景及其对土壤因子的响应

doi:10.11720/wtyht.2025.1189

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Abstract

This study aims to determine the selenium (Se) background values of oils along the northern margin of the Qinghai-Tibet Plateau and serve the utilization of Se-rich resources, as well as the prevention and control of Se deficiency risks. To this end, this study systematically collected 8 273 surface soil samples and 2 190 deep soil samples, analyzed and tested the Se content and other relevant indicators, and examined the response relationships between soil Se and factors such as soil type and physicochemical properties. The results indicate that the surface and deep soils exhibit Se background values of 0.188×10^-6 and 0.153×10^-6, respectively. High Se background values are identified in the Menyuan Basin, the Xining Basin, the northern part of Qinghai Lake, and the Lagrange and Daban mountains. The highest Se background values occur in soils with the weathering materials of red and coal-bearing clastics of the Paleogene Xining Group as parent materials. The Se background values exhibit a negative correlation with pH and a positive correlation with the contents of organic matter and iron-aluminum oxides. Se in soils tends to accumulate in woodlands, grasslands, peat-rich marsh soils, and meadow soils. The study posits that the soil-forming parent materials with Se background values, including red and coal-bearing clastics of the Paleogene Xining Group, serve as the primary factor controlling the formation of Se-rich soils, and the secondary controlling factors include carbon-rich forests, grasslands, meadow soils, and marsh soils. The transportation by water streams and sedimentary transformation of these controlling factors contribute to the formation of the spatial distribution pattern of localized Se enrichment in the soils of the northern margin of the Qinghai-Tibet Plateau.

Key words： northern margin of the Tibet Plateau soil selenium background value influential factor

Received: 24 April 2024 Published: 07 August 2025

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	Articles by authors
	Qiang MA
	Xiao-Nong QIANG
	Jin-Hong WU
	Lu DAI
	Lian-Zhen HE
	Shuai WANG
	Nan MA

Cite this article:

Qiang MA,Xiao-Nong QIANG,Jin-Hong WU, et al. Selenium background values and their responses to soil factors along the northern margin of the Tibetan Plateau[J]. Geophysical and Geochemical Exploration, 2025, 49(4): 965-972.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.1189 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I4/965

Geological sketch map of the study area
1—Cenozoic;2—Mesozoic;3—late Paleozoic;4—early Paleozoic;5—Neoproterozoic;6—Mesoproterozoic;7—Paleoproterozoic;8—sampling points;①—Corridor south Mountain;②—Menyuan Basin;③—Daban Mountain;④—Qinghai Lake Basin;⑤—Xining Basin;⑥—Minhe Basin;⑦—Laji Mountain;⑧—Gonghe Basin;⑨—Guide Basin;⑩—Nanshan,Qinghai;11—Heka Mountain

Histograms of surface (a) and deep (b) soil data in the study area

Statistics of geochemical parameters of Se content in soil

Geochemical distribution of Se in the top soil

Geochemical distribution of Se in the deep soil

Soil Se content of different parent materials

Correlation analysis of soil Se with other indicators

Scatter plot of Se and related element content

Se statistics of different soil types

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