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黄河源区玛多盆地沙漠化土地粒度特征
引用本文:胡菁菁,胡光印,董治宝.黄河源区玛多盆地沙漠化土地粒度特征[J].中国沙漠,2022,42(4):242-252.
作者姓名:胡菁菁  胡光印  董治宝
作者单位:陕西师范大学 地理科学与旅游学院,陕西 西安 710119
基金项目:国家自然科学基金项目(42071004);第二次青藏高原综合科学考察研究项目(2019QZKK0403)
摘    要:为探讨黄河源区玛多盆地风沙沉积物分异特征,采集玛多盆地不同沙漠化程度、不同地貌部位、不同动力条件的沉积物样品进行粒度分析。结果表明:(1)玛多盆地沉积物随沙漠化程度增加,平均粒径增大,粗颗粒组分增多,分选性变好,偏度向负偏靠拢,峰态逐渐转向平坦,频率分布曲线也由双峰态转变为单峰态。(2)流动沙丘以中沙和细沙组分为主,分选性好,偏度近对称,峰度为中等尖锐。各个沙丘不同地貌部位沉积物粒度参数分异受风向改变的影响,变化规律不明显。流动沙丘沉积物相较于流动沙地沉积物的粒径更粗,分选性更好,可能是沙丘形成过程中风对沉积物颗粒的再次分选所致。(3)河流阶地剖面沉积物的主要粒级为中沙和细沙,分选中等偏差,偏度为正偏,峰尖锐,河流阶地沉积物的粒度组成与周围风成作用形成的流动沙丘(地)的粒度组成高度相似,极有可能是当地风沙活动的主要物源。

关 键 词:沙漠化  粒度  玛多盆地  黄河源  青藏高原  
收稿时间:2022-05-10
修稿时间:2022-06-05

Particle size characteristics of aeolian desertified land in Madoi Basin of the source region of Yellow River
Jingjing Hu,Guangyin Hu,Zhibao Dong.Particle size characteristics of aeolian desertified land in Madoi Basin of the source region of Yellow River[J].Journal of Desert Research,2022,42(4):242-252.
Authors:Jingjing Hu  Guangyin Hu  Zhibao Dong
Institution:School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
Abstract:To explore the differentiation rule of aeolian sediment characteristics in Madoi Basin of the source region of Yellow River, the sediments with different degrees of aeolian desertification, different geomorphic parts and different dynamic conditions in the Madoi Basin were sampled for particle size analysis. The results show that: (1) With the development of aeolian desertification, the mean grain size of sediments in the Madoi Basin increases, the proportion of coarse particle fraction grows, the sorting coefficient becomes better, the skewness approaches to negative skewness, the kurtosis gradually shifts to flat, and the frequency distribution curve also changes from bimodal to unimodal. (2) Sand dunes are all dominated by medium sand and fine sand fractions, with good sorting coefficient, nearly symmetric skewness and moderately sharp kurtosis. There is no obvious change rule of sediment particle size parameters in different landform parts of each dune due to the change of wind direction. The coarser particle size and better sorting of aeolian sand dune sediments compared with the active aeolian sandy land sediments may be due to the re-sorting of the sediments by the wind during the formation of the dunes. (3) Medium sand and fine sand are the main grain fractions of the river terrace profile, with medium deviation in sorting, positive deviation in skewness and sharp kurtosis. The grain size composition of the river terrace sediment is highly similar to the active aeolian sand dunes and sandy land formed by the surrounding wind-forming action, which is most likely to provide source material for the local aeolian activities.
Keywords:aeolian desertification  particle size  Madoi Basin  the source region of Yellow River  Tibetan Plateau  
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