摘要
为定量探讨沙柳方格沙障对沙粒粒度组成与特征的影响,以流动沙丘(LS)、设障2a沙丘(TS)和设障6a沙丘(SS)为研究对象,在沙丘不同部位、不同土层和障格内不同位置进行取样,分析样品的粒度组成与特征。结果表明:1)随着设障年限的增加,粘粒和粉粒含量增加,细砂含量下降,SS粘粒和粉粒含量与TS和LS的含量差异显著,而TS和LS二者间差异不明显;LS、TS各粒级含量在三个层次间差异均不明显,而SS 0-5cm的粘粒、粉粒以及极细砂粒体积含量较其他2层差异显著。2)SS的频率分布曲线变化幅度小于TS和LS的频率分布曲线变化幅度。各沙丘的平均粒径MZ、分选系数δ、偏度SK、峰度KG的大小顺序均表现为SS<TS<LS,SS与其他两种类型沙丘粒度参数间差异明显,后二者粒度参数间差异不明显,且SS和TS各个土层的各个粒度参数的大小顺序均表现为0-5cm<5-10cm<10-15cm,而LS各个土层之间的粒度参数差异不明显。3)SS和TS障格西北和东南角粉粒和粘粒含量高于障格中部,各粒度参数则表现为障格中部小于障格西北角或者东南角的特征。
In order to study the effect of Salix psammophila checkerboard sand barrier on the composition and characteristics of particle size quantitatively, the years （TS） and the sand dune with sand barrier drifting sand dune （ LS）, the sand dune with sand barrier of two of six years （SS） were studied. Samples were taken on different parts of sand dunes and in different layers of sand and on different positions of checkerboard sand barrier, and composition and characteristics of particle size were studied. The results can be seen as follows： （1） with the sand barrier setting time increases, the content of silt and clay increases and the content of fine sand deceases. The content of silt and clay of SS shows significant difference with the content of silt and clay of TS and IS, when there is no significant difference between TS and LS ; There is no significant difference in the content of each par ticle size in the three sand layers of LS and TS, but the volume content of silt, clay and fine sand of 0 Scm of SS is different from the two other layers. （2）, The rangeability of frequency distribution curve of SS is smaller than the rangeability of TS and LS. The order of average particle Mz, sorting coefficient 8, skewness Sx and kur tosis KG of each sand dunes is SS 〈 TS 〈 LS, each particle parameters of SS are significant different from the two other sand dunes, and there is no significant difference between TS and IS, and the order of each particle pa rameters of each layers of SS and TS is 0 5cm 〈 5 10cm 〈 10 15cm, but the particle parameters of each lay ers of IS have no significant difference. （3） The content of silt and clay of SS and TS on the northwest and south east corner of the checkerboard sand barrier is bigger than the content in the center of the checkerboard sand bar tier, and each particle parameters in the center of the checkerboard sand barrier are smaller than the ones on the northwest and southeast corner.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2013年第1期165-170,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(项目编号:30972420
40961036)资助
关键词
库布齐沙漠
沙柳方格沙障
粒度参数
粒度组成
Kubuqi Desert
Salix Psammophila
checkerboard sand barrier
particle size parameters
particlesize composition
