浑善达克沙地风蚀物粒度和元素分异特征  

Grain size and element differentiation during aeolian processe in Otindag Sandy Land

作　　者：娄俊鹏 蔡迪文 马文勇[2,4] 焦琳琳 Lou Junpeng;Cai Diwen;Ma Wenyong;Jiao Linlin(Chinalco Environmental Protection and Energy Conservation Group Co.,Ltd,Beijing 102209,China;Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;School of Geographical Sciences,Lingnan Normal University,Zhanjiang 524048,Guangdong,China;Key Laboratory of Digital Earth Sciences,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中铝环保节能集团有限公司,北京102209 [2]中国科学院地理科学与资源研究所,北京100101 [3]岭南师范学院地理科学学院,广东湛江524048 [4]中国科学院空天信息创新研究院数字地球重点实验室,北京100094

出　　处：《中国沙漠》2024年第5期143-154,共12页Journal of Desert Research

基　　金：国家自然科学基金项目(42301003,41930640);国家重点研发计划项目(2023YFC3708905)。

摘　　要：为探究浑善达克沙地风蚀物粒度和化学元素的分异特征及相互关系,通过风洞试验分析了不同风速下风蚀物的粒径级配、粒度分布频率曲线和粒度参数等特征以及风蚀物元素含量的变化规律。结果表明:土壤风蚀速率与风速符合指数函数关系,不同风速下风蚀物的粒度分布曲线皆为单峰且峰态皆非常宽,平均粒径2.46~2.58Ф,分选性较差,呈极度正偏。风蚀物中元素含量随风速变化模式主要包括连续下降型、“W”下降型和先升后降型,大部分元素含量与风蚀物中<125μm部分极显著正相关关系,而与125~500μm部分极显著负相关。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 2.46Фand 2.58Ф,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<125μm portion of wind eroded sediment,and a significant negative correlation with the 125-500μm portion.

关 键 词：风洞试验 化学元素 粒度 分异特征 浑善达克沙地 

分 类 号：S152[农业科学—土壤学]