浑善达克沙地风蚀物粒度和元素分异特征
收稿日期: 2024-02-21
修回日期: 2024-04-15
网络出版日期: 2024-10-15
基金资助
国家自然科学基金项目(42301003);国家重点研发计划项目(2023YFC3708905)
Grain size and element differentiation during aeolian processe in Otindag Sandy Land
Received date: 2024-02-21
Revised date: 2024-04-15
Online published: 2024-10-15
娄俊鹏 , 蔡迪文 , 马文勇 , 焦琳琳 . 浑善达克沙地风蚀物粒度和元素分异特征[J]. 中国沙漠, 2024 , 44(5) : 143 -154 . DOI: 10.7522/j.issn.1000-694X.2024.00045
In order to explore the differentiation and relationship between soil particle size and chemical elements during aeolian processes in Otindag Sandy Land, and to provide data and theoretical support for ecological governance and vegetation restoration in arid areas, this study analyzed the characteristics of grain size gradation, grain size distribution frequency curve and grain size parameters of wind eroded sediment at different wind speeds, as well as the changes of elemental content of wind eroded sediment through wind tunnel tests. The results show that the relationship between soil wind erosion rate and wind speed follows an exponential law, and the particle size distribution of wind eroded sediment is unimodal. The average particle size of wind eroded sediment at different wind speeds is between 2.46 Ф and 2.58 Ф, and the sorting of the sediment is extremely positive, and the peak state is very wide as well. The changes of elemental content in wind eroded sediment with wind speed mainly include three types, namely, continuous decrease type, "W" decrease type, and rise-and-fall type. Most of the elemental content has a significant positive correlation with the <125 μm portion of wind eroded sediment, and a significant negative correlation with the 125-500 μm portion.
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