A reference soil group in the World Reference Base for Soil Resources classification scheme. Fluvisols form on recent alluvial deposits and have a fluvic horizon lying about 25 cm below the surface and extending to 50 cm depth.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。