School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China;
School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China;
Guangxi Bureau of Geology&Mineral Prospecting&Exploitation Nanning 530023 China;
School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China;
Guangxi Institute of Geological Survey Nanning 530023 China;
Guangxi Institute of Geological Survey Nanning 530023 China;
Geology Team No.4 of Guangxi Zhuang Autonomic Region Nanning 530031 China;
Guangxi Geophysical Investigation Institute Liuzhou 545005 China;
Key Laboratory of Surficial Geochemistry Ministry of Education School of Earth Sciences and Engineering Nanjing University Nanjing 210023 China;
Heavy metals; Soil; Rice grain; Ecological risk assessment; Karst area in Guangxi; High geochemical background;