恩施地区土壤与农作物硒镉地球化学特征

doi:10.11720/wtyht.2020.1297

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Abstract

The 1:25 million land geochemical survey conducted in Enshi area shows that the surface soil in Enshi area is rich in selenium, and the content of cadmium is also high. Based on the data of 3 950 surface soil samples and 362 crop samples in this area, the geochemical characteristics of selenium and cadmium, co-generation factors, and the capability of different types of crops for absorbing and enriching the two elements are discussed.The results show that the selenium and cadmium in the surface soil of Enshi area is associated with each other. The distribution of the two elements is mainly controlled by the Permian soil parent material, and the occurrence of selenium and cadmium is closely related to organic matter and sulfide in soil. Comparison of BCF of selenium and cadmium in different crops shows that ginkgo, corn and tea have higher absorption capacity for selenium than for cadmium, and hence these crops could be used as the preferred crops for the development of selenium-enriched agricultural products in Enshi area. At the same time, the pH of the soil should also be considered. The medium alkaline soil may be more likely to avoid the risk of cadmium enrichment in agricultural products. In addition, selenium has a detoxifying effect on cadmium. Selenium-rich environment will significantly reduce the harm of cadmium to human body.

Key words： Enshi surface soil selenium cadmium geochemical characteristics bioaccumulation health effect

Received: 27 May 2019 Published: 24 June 2020

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	Articles by authors
	Shi-Qi TANG
	Neng WAN
	Ming-Zhong ZENG
	Ke YANG
	Fei LIU
	Min PENG
	Kuo LI
	Zheng YANG

Cite this article:

Shi-Qi TANG,Neng WAN,Ming-Zhong ZENG, et al. Geochemical characteristics of selenium and cadmium in soil and crops in Enshi area[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 607-614.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1297 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/607

Stratigraphic map of the study area

Determination criteria and results of soil selenium and cadmium in study area

Distribution of selenium and cadmium in surface soil of the study area and its spatial relationship with the Permian strata

Statistical table of soil selenium and cadmium content in different geological units in the study area10^-6

Correlation maps of different elements in soil

Table of characteristics of selenium and cadmium in different crops

BCF comparison of selenium and cadmium of different crops in the study area

BCF comparison of selenium and cadmium in corn seeds in different pH ranges

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