重庆典型农业区土壤硒地球化学特征及影响因素

doi:10.11720/wtyht.2020.1471

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Abstract

Nanchuan District is a typical agricultural area in Chongqing. The authors investigated the geochemical characteristics and influential factors of soil Se from Nanchuan District of Chongqing City to provide some scientific bases for the survey of environment background and regional production as well as human health. More than 8 496 soil samples from the topsoil layers(0~20 cm)all over the Nanchuan District were collected and analyzed for content and distribution of soil Se and their relationships with parent material, soil properties (pH and Corg), altitude and human factors. The research results show that the content of total selenium ranges from 0.056×10^-6 to 10.80×10^-6 with a mean value of 0.46×10^-6, which indicates that the most of the soils are in the category of Se-sufficiency to Se-abundance, with 42.31% being Se-enrichment. The spatial characteristics of soil Se content in Nanchuan District show "high in the south and low in the north", and the soil Se enrichment areas are mainly distributed in Shuijiang Town, Nanping Town, Nanchuan urban area and Jinfo Mountain. Among the types of soils existing in the Nanchuan District, Se content is the highest in industrial and mining land soil and the lowest in farmland. The spatial characteristics of soil Se content and strata show a similar variation pattern. The soil Se enrichment is mainly distributed in Permian, Triassic (Feixianguan Formation and Jialingjiang Formation), Silurian, Ordovician and Cambrian strata, which indicates that the soil Se content is mainly controlled by parent materials in Nanchuan District. In addition, Se content in soil is significantly positively correlated with soil organic matter and altitudes, but significantly negatively correlated with soil pH.

Key words： Se-enriched agriculture geochemical characteristics soil-profile distribution influence factors Nanchuan of Chongqing

Received: 08 October 2019 Published: 28 August 2020

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	Articles by authors
	Fei YU
	Feng-Lei ZHANG
	Yong-Wen ZHANG
	Rui WANG
	Jia-Bin WANG

Cite this article:

Fei YU,Feng-Lei ZHANG,Yong-Wen ZHANG, et al. Geochemical characteristics and influential factors of soil selenium in typical agricultural area, Chongqing[J]. Geophysical and Geochemical Exploration, 2020, 44(4): 830-838.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1471 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I4/830

Geographical location and geological map of the study area

Se contents in surface soils in the study area and other region of China

Classification of soil Se content in the study area

Content distribution map of soil in the study area

Se contents in different strata of soil in the study area

The correlation coefficients between Se and major elements in soils in study area

The correlation coefficients between Se and heavy metal contents in soils in study area

Correlation coefficients between Se and organic matter or pH of soil in the study area

Se contents in different altitude of soil in the study area

Se concentrations in different land use types of soil in the study area

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