AUTHOR=Tong Lei , Yang Aoran , Fan Mingyue , Wang Dan , Liu Yi , Huang Xiangqiang , Xiang Lian , Fu Rongsheng , Cheng Longfeng TITLE=Assessment of the sources and health risks of heavy metals in the soil-rice system based on positive matrix factorization and Monte Carlo simulation JOURNAL=Frontiers in Environmental Science VOLUME=Volume 13 - 2025 YEAR=2025 URL=https://www.frontiersin.org/journals/environmental-science/articles/10.3389/fenvs.2025.1558308 DOI=10.3389/fenvs.2025.1558308 ISSN=2296-665X