Spatial distribution and environmental impact factors of soil selenium in Hainan Island, China

Gong, Jingjing; Yang, Jianzhou; Wu, Hui; Gao, Jianweng; Tang, Shixin; Ma, Shugen

doi:10.1016/j.scitotenv.2021.151329

Cited by 32 publications

(6 citation statements)

References 58 publications

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Section: Relationship Of Soil Type With Se Contents In Topsoilsupporting

confidence: 91%

“…The OM content of Anthrosols is high because of the double action of bioaccumulation and organic fertilizer. Thus, the mean Se content of Anthrosols and Ferralsols was higher than that of Cambisols, a result consistent with the findings of Gong et al [54]. Permian is an essential coal-forming period characterized by intense structural movement and frequent large-scale biological extinction events [56][57][58].…”

Section: Relationship Of Soil Type With Se Contents In Topsoilsupporting

confidence: 90%

“…Nearly 99% of the cultivated land is Se-rich and Se-sufficient. Spatial disparities in Se levels are likely influenced by factors such as varying parent materials, topography, and climate, all of which impact the sources and retention of Se [54]. Indeed, China faces widespread Se deficiency.…”

Section: Spatial Distribution Of Se In Topsoilmentioning

confidence: 99%

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Spatial Distribution and the Key Impact Factors of Soil Selenium of Cultivated Land in Lianyuan City, China

Guo,

Chen,

Lin

et al. 2024

Agriculture

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Selenium (Se) is a micronutrient that has attracted significant attention, because the threshold for human health is low. During soil surveys in China, large areas of low-Se soil were found, and this condition may increase the probability of people suffering from Se deficiency. A multi-purpose regional geochemical survey conducted in the Lou Shao basin of Hunan Province found abundant Se-rich soils in Lianyuan City. However, as the primary grain-producing area in Hunan Province, the key factors affecting the spatial distribution of soil Se in the cultivated land of Lianyuan City remain to be elucidated. Therefore, based on the data of 5516 topsoil samples (0–20 cm) of cultivated land in Lianyuan City, we used geostatistics, correlation analysis, and a Geodetector to explore the effects of geological conditions (strata), soil types, soil properties, and topography on the distribution of Se in soil. The results showed that (1) in comparison to cultivated land in the Chinese mainland, Japan, Belgium, and Sweden, the cultivated land in Lianyuan City exhibits higher Se contents, with Se-sufficient and Se-rich areas accounting for 9.74% and 88.96% of the total area, respectively; (2) the distribution of high-Se soil was consistent with that in the Longtan Formation, Dalong Formation, and Daye Formation; (3) organic matter (OM) showed a positive correlation with Se, while both the elevation and slope were negatively correlated with Se; (4) stratum had the most significant effect on the spatial variation in soil Se, followed by OM. Lianyuan City is a typical Se-rich area, and the high level of Se in soil reduces the risk of local residents suffering with diseases caused by Se deficiency. The synergistic effect of stratum and OM is the key factor influencing Se enrichment in soils. Moreover, low-lying flat areas are more conducive to the accumulation of Se. This study will help farmers to identify suitable Se-rich cultivation areas in order to increase the Se content in crops, thereby providing a valuable basis for improvements in human health and the optimization of agricultural strategies.

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Section: Relationship Of Soil Type With Se Contents In Topsoilsupporting

confidence: 91%

Section: Relationship Of Soil Type With Se Contents In Topsoilsupporting

confidence: 90%

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Spatial Distribution and the Key Impact Factors of Soil Selenium of Cultivated Land in Lianyuan City, China

Guo,

Chen,

Lin

et al. 2024

Agriculture

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“…By using the enrichment factor method, uncertainties due to factors such as sample collection, analysis, and distance from the pollution source can be eliminated, thereby making the results more reliable and accurate compared with the usual concentration comparisons. In this study, we utilized the CEF method to describe the characteristics of selenium enrichment in topsoil, where CEF was calculated according to Gong et al [ 49 ] as

where C i is the content of element i in a topsoil or subsoil sample and C j is the content of fixed element j in a topsoil or subsoil sample.…”

Section: Methodsmentioning

confidence: 99%

Nitrogen Application Can Optimize Form of Selenium in Soil in Selenium-Rich Areas to Affect Selenium Absorption and Accumulation in Black Wheat

Kong,

Huo,

et al. 2023

Plants

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The composition and form of selenium in the soil have significant effects on the selenium content of crops. In this study, we investigated the selenium absorption pathway in plants by studying the interaction between nitrogen fertilizer and soil selenium. Our results showed that the selenium concentration enrichment factors (CEF) varied within the same region due to nitrogen fertilizer application, where they ranged from 1.33 to 5.02. The soil selenium flow coefficient (mobility factor, MF) increased with higher nitrogen application rates. The sum of the MF values for each soil layer treated with nitrogen application rates of 192 kg hm−2 and 240 kg hm−2 was 0.70, which was 64% higher than that for the control group with no nitrogen application. In the 0–20 cm soil layer, the highest summed water-soluble and exchangeable selenium and relative percentage of total selenium (12.45%) was observed at a nitrogen application rate of 240 kg hm−2. In the 20–40 cm soil layer, the highest relative percentage content of water-soluble and exchangeable selenium and total selenium (12.66%) was observed at a nitrogen application rate of 192 kg hm−2. Experimental treatment of black wheat with various concentrations of sodium selenite showed that selenium treatment at 50 μmol L−1 significantly increased the reduced glutathione (GSH) levels in the leaves and roots of seedlings, where the GSH contents increased by 155.4% in the leaves and by 91.5% in the roots. Further analysis of the soil–black wheat system showed that nitrogen application in selenium-rich areas affected the soil selenium flow coefficient and morphological composition, thereby changing the enrichment coefficient for leaves (0.823), transport capacity from leaves to grains (–0.530), and enrichment coefficient for roots (0.38). These changes ultimately affected the selenium concentration in the grains of black wheat.

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“…According to the current study, Se can limit heavy metal uptake via immobilizing the compounds generated by plants. Se antagonism with heavy metals (As, Cd Cr, Hg, Sb, and Pb) in the soil is connected to the soil pH [16]. Therefore, the soil's pH value is a key determinant of the bioavailability of Se in soil [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Acidification on the Production of Se-Rich Tea

Yang,

Zhang,

et al. 2023

Plants

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Selenium (Se)-enriched tea is a well-regarded natural beverage that is often consumed for its Se supplementation benefits. However, the production of this tea, particularly in Se-abundant tea plantations, is challenging due to soil acidification. Therefore, this study aimed to investigate the effects of changes in Se under acidified soil conditions. Eight tea plantation soil monitoring sites in Southern Jiangsu were first selected. Simulated acid rain experiments and experiments with different acidification methods were designed and soil pH, as well as various Al-ion and Se-ion concentrations were systematically determined. The data were analyzed using R statistical software, and a correlation analysis was carried out. The results indicated that as the pH value dropped, exchangeable selenium (Exc-Se) and residual selenium (Res-Se) were transformed into acid-soluble selenium (Fmo-Se) and manganese oxide selenium (Om-Se). As the pH increased, exchange state aluminum (Alex) and water-soluble aluminum (Alw) decreased, Fmo-Se and Om-Se declined, and Exc-Se and Res-Se increased, a phenomenon attributed to the weakened substitution of Se ions by Al ions. In the simulated acid rain experiment, P1 compared to the control (CK), the pH value of the YJW tea plantation decreased by 0.13, Exc-Se decreased by 4 ug mg−1, Res-Se decreased by 54.65 ug kg−1, Fmo-Se increased by 2.78 ug mg−1, and Om-Se increased by 5.94 ug mg−1 while Alex increased by 28.53 mg kg−1. The decrease in pH led to an increase in the content of Alex and Alw, which further resulted in the conversion of Exc-Se to Fmo-Se and Om-Se. In various acidification experiments, compared with CK, the pH value of T6 decreased by 0.23, Exc-Se content decreased by 8.35 ug kg−1, Res-Se content decreased by 40.62 ug kg−1, and Fmo-Se content increased by 15.52 ug kg−1 while Alex increased by 33.67 mg kg−1, Alw increased by 1.7 mg kg−1, and Alh decreased by 573.89 mg kg−1. Acidification can trigger the conversion of Exc-Se to Fmo-Se and Om-Se, while the content of available Se may decrease due to the complexation interplay between Alex and Exc-Se. This study provides a theoretical basis for solving the problem of Se-enriched in tea caused by soil acidification.

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Spatial distribution and environmental impact factors of soil selenium in Hainan Island, China

Cited by 32 publications

References 58 publications

Spatial Distribution and the Key Impact Factors of Soil Selenium of Cultivated Land in Lianyuan City, China

Spatial Distribution and the Key Impact Factors of Soil Selenium of Cultivated Land in Lianyuan City, China

Nitrogen Application Can Optimize Form of Selenium in Soil in Selenium-Rich Areas to Affect Selenium Absorption and Accumulation in Black Wheat

Effect of Soil Acidification on the Production of Se-Rich Tea

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