硒（Se）对人类健康至关重要，具有抗癌、抗氧化和抗病毒的特性。本研究采用热点分析法，研究了广西农业土壤中稻米硒的空间分布特征及其与土壤硒之间的变化关系。根据热点和冷点地图显示，广西农业土壤中稻米硒与土壤硒呈正相关。在广西中部（如柳州、来宾）高稻米硒伴随着高土壤硒，而在西部（如百色）低稻米硒与低土壤硒相对应。然而，热点分析地图表明，广西西南部地区具有低稻米硒和高土壤硒的特殊特征（如崇左市）。这种特殊模式与碳酸岩区域中的高浓度铁氧化物（铁锰结核）密切相关。热点分析法对揭示广西稻米硒的空间分布特征和隐藏模式具有重要作用。© 2023. 作者和 Springer Nature B.V. 独家许可。

Selenium (Se) is essential to human health, anti-cancer, possessing antioxidant, and antiviral properties. In this study, the spatial patterns of rice Se and their varying relationship with soil Se on a regional scale were studied using hot spot analysis for the agricultural soils in Guangxi. According to the hot and cold spot maps, rice Se correlates positively with soil Se in Guangxi agricultural soils. High rice Se accompanies high soil Se in the central part of Guangxi (e.g., Liuzhou, Laibin), and low rice Se is in line with low soil Se in the western part (e.g., Baise). However, the hot spot analysis maps indicate that southwestern Guangxi exhibits a special characteristic of low rice Se with high soil Se (e.g., Chongzuo). This special pattern is strongly associated with the high concentrations of Fe2O3 (ferromanganese nodules) in the carbonate rock area. The hot spot analysis proves useful in revealing the spatial patterns of rice Se in Guangxi and identifying the hidden patterns.© 2023. The Author(s), under exclusive licence to Springer Nature B.V.