Applied to a soil horizon (a gypsic horizon) where secondary gypsum (CaSO4) has accumulated through more than 150 mm of soil, so that this horizon contains at least 5% more gypsum than the underlying 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。