| Citation: |
Xiu-jin Liu, Ke Yang, Fei Guo, Shi-qi Tang, Ying-han Liu, Li Zhang, Hang-xin Cheng, Fei Liu, 2022. Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China, China Geology, 5, 1-11. doi: 10.31035/cg2021038
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Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China
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Abstract
To illuminate the migration and transformation of selenium (Se) in the igneous rock-soil-rice system, 285 pairs of rhizosphere soil and rice samples were collected from the granitoid and basalt areas in Hainan Province, South China. The contents of Se in soils derived from granitoid and basalt are, respectively, 0.19±0.12 mg/kg and 0.34±0.39 mg/kg, which are much higher than Se contents in granitoid and basalt. Selenium shows remarkable enrichment from granitoid and basalt to soils. The mobile fraction of Se in soils derived from granitoid is 0.0100±0.0034 mg/kg, which is significantly higher than that of basalt (0.0058±0.0039 mg/kg). Although soil derived from basalt shows higher Se contents, Se contents in rice samples, mobile fractions of Se in soils, and biological concentration factor (BCF) is similar or even lower than that from granitoid. Basalt consist of calcic plagioclase and pyroxene, and are much richer in Fe, Al, and Ca than granitoid. Correspondingly, the basalt-derived soils have higher goethite, hematite, kaolinite, cation exchange capacity (CEC) content, and higher pH than the granitoid-derived soils, which result in higher adsorption capacity for Se and relatively lower Se bioavailability. Soils derived from granitoid and basalt in tropical regions are beneficial to produce Se-rich rice.
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Keywords:
- Selenium /
- Granitoid /
- Basalt /
- Soil properties /
- Tropical soil /
- Se-rich rice /
- Agricutural geological survey engineering /
- Hainan Province /
- China
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References
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Xiu-jin Liu, Ke Yang, Fei Guo, Shi-qi Tang, Ying-han Liu, Li Zhang, Hang-xin Cheng, Fei Liu, 2022. Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China, China Geology, 5, 1-11. doi: 10.31035/cg2021038
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Figure 1.
a‒Location of Hainan Island; b‒geological map showing the distribution of rocks and sample locations; c‒photos of rice grown in granitoid-derived soils; d‒photos of rice grown in basalt-derived soils.
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Figure 2.
Tukey boxplots of pH (a), organic carbon (b), clay proportion (c), and CEC (d) in soils derived from granitoid and basalt.
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Figure 3.
Tukey boxplots of Se content in soil (a), Se content in rice (b), and BCF of Se (c) in the soil-rice system from the granitoid and basalt areas. The BCF of Se is the ratio of Se in rice to Se in soil. The soil-rice sample numbers in granitoid and basalt areas are 138 and 147, respectively.
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Figure 4.
Binary correlation diagram displaying characteristics of Se content in soil and rice from granitoid and basalt areas.
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Figure 5.
Binary correlation diagram displaying the correlation between BCF of Se in the soil-rice system and Se content in soil from granitoid and basalt areas.
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Figure 6.
Binary correlation diagram displaying the correlation between soluble Se and TFe2O3 content in soil from granitoid and basalt areas.
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Figure 7.
Binary correlation diagram displaying the correlation between soil pH and Se content and BCF of Se in soil from granitoid and basalt areas, respectively.