Effects and mechanism of igneous rock on selenium in the tropical soil-rice system in Hainan Province, South China  

作　　者：Xiu-jin Liu Ke Yang Fei Guo Shi-qi Tang Ying-han Liu Li Zhang Hang-xin Cheng Fei Liu 

机构地区：[1]Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China [2]Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth’s Critical Zone,Chinese Academy of Geological Sciences,Langfang 065000,China [3]Research Center of Geochemical Survey and Assessment on Land Quality,China Geological Survey,Langfang 065000,China

出　　处：《China Geology》2022年第1期1-11,共11页中国地质（英文）

基　　金：financially supported by the projects of the China Geological Survey(DD20190518,DD20190527)。

摘　　要：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 p H 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.

关 键 词：SELENIUM GRANITOID BASALT Soil properties Tropical soil Se-rich rice Agricutural geological survey engineering Hainan Province China 

分 类 号：S154.4[农业科学—土壤学] P584[农业科学—农业基础科学]