Year
Month
(Peer-Reviewed) Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China
Xiu-jin Liu 刘秀金 ¹ ² ³, Ke Yang 杨柯 ¹ ² ³, Fei Guo 郭飞 ¹ ² ³, Shi-qi Tang 唐世琪 ¹ ² ³, Ying-han Liu 刘英汉 ¹ ² ³, Li Zhang 张利 ¹ ² ³, Hang-xin Cheng 成杭新 ¹ ² ³, Fei Liu 刘飞 ¹ ² ³
¹ Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
中国 廊坊 中国地质科学院 地球物理地球化学勘查研究所
² Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone, Chinese Academy of Geological Sciences, Langfang 065000, China
中国 廊坊 中国地质科学院 地球表层碳-汞地球化学循环重点实验室
³ Research Center of Geochemical Survey and Assessment on Land Quality, China Geological Survey, Langfang 065000, China
中国 廊坊 中国地质调查局 土地质量地球化学调查评价研究中心
China Geology, 2022-01-15
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.
Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China_1
Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China_2
Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China_3
Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China_4
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