Surface or subsurface soil horizon cemented by gypsum so strongly that dry fragments will not slake in water. The cementation restricts penetration by plant roots. This is a diagnostic horizon.
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。