不同类型富硒土壤的生物有效硒特征

doi:10.11720/wtyht.2023.2660

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Abstract

Bioavailable selenium (Se) is an important indicator used to evaluate the supply capacity of Se in the soil to plants. There is a lack of national standard methods for testing bioavailable Se in the soil in China presently. This study used ten different chemical extractants to extract bioavailable Se from the soil. The results show that the extraction capacity of extractants was in the order of NaOH (10.57%) > SOL-Se+EX-Se (8.10%) > AB-DTPA (6.79) > NaHCO₃(4.99%) > K₂SO₄(4.57%) > KH₂PO₄-K₂HPO₄(4.33%) > KH₂PO₄(3.05%) > SOL-Se (2.28%) > EDTA (1.40%) > NH₄F-HCl (1.22%). Among them, the bioavailable Se extracted from the soil by KH₂PO₄, NaHCO₃, SOL-Se, KH₂PO₄-K₂HPO₄, and AB-DTPA was significantly correlated with the Se content of crops. As revealed by the relationship between the percentage content of bioavailable Se in soil and soil properties, the percentage content of bioavailable Se in soil significantly correlated with indicators such as the chemical index of alteration (CIA), LOI, pH, Eh, P, and SiO₂. Among them, pH and Eh mainly affect the existence form of Se in the soil, while indicators such as CIA, LOI, P, and SiO₂ reflect the alteration degree of soil and the effect of adsorbates on bioavailable Se in soil. The results of this study can provide data support and a scientific basis for the development of Se-based ecological agriculture and the development and utilization of Se-rich land resources.

Key words： bioavailable Se soil extractant

Received: 07 December 2021 Published: 24 February 2023

ZTFLH:

P632

Corresponding Authors: XIE Shu-Yun E-mail: qyangw@outlook.com;tinaxie@edu.cug.com

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	Ling-Yang YAO
	Shu-Yun XIE
	Zheng-Yu BAO
	Ming MA
	Neng WAN

Cite this article:

Ling-Yang YAO,Shu-Yun XIE,Zheng-Yu BAO, et al. Characteristics of bioavailable selenium in different types of selenium-rich soils[J]. Geophysical and Geochemical Exploration, 2023, 47(1): 238-246.

URL:

https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.2660 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I1/238

Soil physical and chemical properties and corresponding corn selenium content in Ziyang area

Different chemical extractants extract the available selenium content in soil

The effective selenium extracted by different chemical extractants accounts for the percentage of total selenium in the soil%

Correlation analysis between available selenium extracted by different chemical extractants and plant selenium(n=17)

Scatter diagram of available selenium extracted by different chemical extractants and plant selenium

Correlation analysis between the percentage of soil available selenium and soil physical and chemical properties (n=51)

Scatter plot of soil available selenium content and soil physical and chemical properties

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