Characteristics of selenium enrichment and assessment of selenium bioavailability using the diffusive gradients in thin-films technique in seleniferous soils in Enshi, Central China

Lyu Chenhao; Qin Yongjie; Zhao Zhuqing; Liu Xinwei

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Characteristics of selenium enrichment and assessment of selenium bioavailability using the diffusive gradients in thin-films technique in seleniferous soils in Enshi, Central China

机译：中华民族埃斯西薄膜技术中薄膜技术中硒富集和硒生物利用度评价的特征

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Agricultural products from seleniferous areas commonly face problems associated with substantial variation in selenium (Se) concentration, which is mainly caused by the heterogeneity of Se bioavailability in soil. Many studies have assessed the bioavailability of Se and its influencing factors using soil samples treated with exogenous Se. Given the distinctly different characteristics of Se-spiked soils and naturally seleniferous soils, exploring Se bioavailability in naturally seleniferous soils is crucial to the stable production of Se-enriched agricultural products. In this study, we used the classical sequential extraction method to determine the Se fractionation and then applied the diffusive gradients in thin-films (DGT) technique to assess the Se bioavailability in naturally seleniferous soils. The results indicated that soluble and exchangeable Se fractions with high bioavailability accounted for only 0.7% and 5.1% of total Se, respectively. Both soluble and exchangeable Se concentrations were significantly positively correlated with soil pH (r = 0.329 and 0.262, respectively; P 0.01). Se mainly exists in Fe-Mn oxide-bound, organic matter-bound, and residual Se fractions with low mobility (94.2% of total Se), among which organic matter-bound Se was the predominant fraction (49.5% of total Se). A significant positive correlation was found between total Se and soil organic matter (r = 0.539; P 0.01). Multiple regression analysis revealed that the DGT-determined Se was mostly derived from soluble and exchangeable Se. The high correlation between the DGT-determined Se fraction and Se uptake by rice (r = 0.91; P 0.01) confirmed that DGT can accurately assess Se bioavailability in naturally seleniferous soils in Enshi and other similar environmental settings. (C) 2021 Elsevier Ltd. All rights reserved.

机译：来自Selenifore的农产品通常面临与硒（SE）浓度的大量变异相关的问题，主要是由于土壤中SE生物利用度的异质性引起的。许多研究已经评估了SE的生物利用度及其利用外源SE处理的土壤样品的影响因素。鉴于Se-Spiked土壤和天然硒的土壤的明显不同特征，在天然硒的土壤中探索SE生物利用度对于富集的农产品稳定生产至关重要。在这项研究中，我们使用经典的连续提取方法来确定SE分馏，然后在薄膜（DGT）技术中施加扩散梯度，以评估天然硒的土壤中的SE生物利用度。结果表明，具有高生物利用度的可溶于和可易换的SE级分别占总SE的0.7％和5.1％。可溶于和可交换的SE浓度与土壤pH（r = 0.329和0.262分别显着呈正相关; P <0.01）。 Se主要存在于Fe-Mn氧化物结合，有机物结合和具有低迁移率的残留Se级分（占总SE的94.2％），其中有机物质结合的SE是主要的级分（占总SE的49.5％）。在总体和土壤有机物之间发现显着的阳性相关性（r = 0.539; p <0.01）。多元回归分析显示，DGT确定的SE主要来自可溶性和可更换的SE。 DGT确定的SE分数与水稻的高度相吸收（R = 0.91; P <0.01）证实，DGT可以在恩施和其他类似环境环境中在天然硒的土壤中准确地评估SE生物利用度。（c）2021 elestvier有限公司保留所有权利。

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来源
《Environmental Pollution》 |2021年第3期|116507.1-116507.10|共10页
作者
Lyu Chenhao; Qin Yongjie; Zhao Zhuqing; Liu Xinwei;
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作者单位

Huazhong Agr Univ Coll Resources & Environm Wuhan 430070 Peoples R China|Huazhong Agr Univ Microelement Res Ctr Wuhan 430070 Peoples R China|Hubei Prov Engn Lab New Type Fertilizer Wuhan 430070 Peoples R China;

Huazhong Agr Univ Coll Resources & Environm Wuhan 430070 Peoples R China|Huazhong Agr Univ Microelement Res Ctr Wuhan 430070 Peoples R China|Hubei Prov Engn Lab New Type Fertilizer Wuhan 430070 Peoples R China;

Huazhong Agr Univ Coll Resources & Environm Wuhan 430070 Peoples R China|Huazhong Agr Univ Microelement Res Ctr Wuhan 430070 Peoples R China|Hubei Prov Engn Lab New Type Fertilizer Wuhan 430070 Peoples R China;

Huazhong Agr Univ Coll Resources & Environm Wuhan 430070 Peoples R China|Huazhong Agr Univ Microelement Res Ctr Wuhan 430070 Peoples R China|Hubei Prov Engn Lab New Type Fertilizer Wuhan 430070 Peoples R China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
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关键词
Sequential extraction; Selenium fractions; Soil pH; Selenium bioavailability; Diffusive gradients in thin-films;

机译：序贯提取;硒分数;土壤pH;硒生物利用度;薄膜中的扩散梯度;

Characteristics of selenium enrichment and assessment of selenium bioavailability using the diffusive gradients in thin-films technique in seleniferous soils in Enshi, Central China

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