Origin of Parent Materials and Pedogensis for Alpine Meadow Soils in Amdo, Northern Tibetan Plateau
详细信息
- 责任者：Lin Yongchong (Institute of Tibetan Plateau Research ; Chinese Academy of Sciences ; Beijing 100085 ; China) ; Feng Jinliang
- 刊名：Journal of Mountain Research
- 出版年：2012
- 卷期：30(6)
- 关键词：土壤 ; soils ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.709-720
- 图表：6 illus., 1 table, 51 refs.
- 分类号：1400
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
摘要
In order to understand the pedogenisis process of alpine meadow soil in Amdo area,northern Tibetan Plateau,we investigated the granulometric composition and physico-chemical properties of alpine meadow soils from eight soil profiles.The results indicate that alpine meadow soils show bimodal distribution patterns with dividing point as about 20 μm.The main peak values are 90 μm,while the second peaks exhibit broad tail with the peak values 3-6 μm.The compositions of various grain size fractions(<2 μm、2-20 μm、20-300 μm、300-2 000 μm) change a little with depth at the soil profiles.The alpine meadow soils mainly consist of very fine sand with mean grain size 60-90 μm.Compared to the loess from Chinese Loess Plateau and eastern Tibetan Plateau,and the Chengdu Clay in the Sichuan Basin,the alpine meadow soils are coarser.Generally,alpine meadow soils in the present study presented a thick layer,homogeneous structure,without gravels,a complete lack of visible bedding,and a clear transition with underlying relics of paleo-weathering crust.Therefore,we propose that the parent materials of alpine meadow soils in Amdo region are aeolian deposits.The aeolian dust aggradation plays an important role in the pedogenesis process of the alpine meadow soils.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |