| GU Tao,ZHAO Xin-wen,LEI Xiao-qing,HUANG Chang-sheng,ZENG Min,LIU Xue-hao,WANG Jie-tao.Distribution and Migration Characteristics of Selenium in the Soil-Plant System of Paddy Fields in the Pearl River Delta, Yamen Town[J].Rock and Mineral Analysis,2019,38(5):545-555 |
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| Distribution and Migration Characteristics of Selenium in the Soil-Plant System of Paddy Fields in the Pearl River Delta, Yamen Town |
| Received:November 04, 2018 Revised:January 27, 2019 |
| DOI：10.15898/j.cnki.11-2131/td.201811030118 |
| Key words: paddy field selenium atomic fluorescence spectrometry soil-plant system distribution migration |
| Author Name | Affiliation | | GU Tao | Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China | | ZHAO Xin-wen | Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China | | LEI Xiao-qing | State Key Laboratory of Biogeology and Environment Geology, China University of Geosciences(Wuhan), Wuhan 430074, China | | HUANG Chang-sheng | Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China | | ZENG Min | Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China | | LIU Xue-hao | Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China | | WANG Jie-tao | Wuhan Center of Geological Survey, China Geological Survey, Wuhan 430205, China |
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| Abstract: |
BACKGROUND:The distribution and migration of selenium in the natural environment is a hot topic. The results of a multi-purpose, regional, geochemical survey showed that the content of selenium in the Pearl River Delta Region soils was relatively high, which was suitable for the planting of selenium-rich agricultural products. However, the rule of selenium migration and transformation in the soil-plant system is not yet clear.
OBJECTIVES:To understand the distribution and migration of selenium in the soil-plant system.
METHODS:Taking Yamen Town, Jiangmen City, a typical selenium-rich area in the Pearl River Delta region as an example, selenium contents in rocks, weathered soils, paddy soils, shallow groundwater, irrigation water and rice samples were analyzed by atomic fluorescence spectrometry.
RESULTS:The mean selenium concentrations in the granite rocks, granite weathered soils, surface soils, profile soils, shallow groundwater, irrigation water and rice of Yamen Town were 0.0208mg/kg, 0.2325mg/kg, 0.5060mg/kg, 0.83mg/kg, 0.0003mg/L, 0.0004mg/L and 0.058mg/kg, respectively. The selenium contents in surface soils were equivalent to the soil background value of the Pearl River Delta (0.51mg/kg), the selenium contents of rice reached the standard of selenium-rich rice.
CONCLUSIONS:The rules of selenium migration in the soil-plant system are as follows:selenium migrates downward in the soil profiles, and migrates downstream along the direction of groundwater runoff. Soil selenium migrates to rice root easily, but migrates with difficulty from roots to the overground parts of rice. The study on the distribution and migration of selenium in the soil-plant system can provide a scientific basis for the exploitation and utilization of selenium-rich resources in this area. |
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