粒径分布； 粒度参数； 风沙运动； 粒配曲线； 毛乌素沙地," /> 粒径分布； 粒度参数； 风沙运动； 粒配曲线； 毛乌素沙地,"/> particle size distribution,particle size parameter,Aeolian sand transport,particle grading curve,Mu Us Sandy Land,"/> 毛乌素沙地风沙土粒径分布特征及其影响因素
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干旱区地理 ›› 2019, Vol. 42 ›› Issue (5): 1003-1010.

• 地表过程研究 • 上一篇    下一篇

毛乌素沙地风沙土粒径分布特征及其影响因素

王 陇1,2，高广磊1,2，张 英1，丁国栋1,2，赵媛媛1,2，彭 玏1,2   

  1. 1 北京林业大学水土保持学院水土保持国家林业局重点实验室，北京 100083；2 宁夏盐池毛乌素沙地生态系统国家定位观测研究站，宁夏 盐池 751500
  • 收稿日期:2019-01-10 修回日期:2019-03-29 出版日期:2019-09-25 发布日期:2019-09-18
  • 通讯作者: 高广磊（1986-），男，博士，副教授，研究方向土壤风蚀.
  • 作者简介:王陇（1994-），男，硕士研究生，研究方向土壤风蚀. E-mail：along@bjfu.edu.cn
  • 基金资助:
    国家自然科学基金项目（31600583）；国家重点研发计划课题（2016YFC0500905）；中央高校基本科研业务费专项（2015ZCQ-SB-02）

 Particle size distribution of aeolian soils in the Mu Us Sandy Land and the influence factors  

WANG Long1,2,GAO Guang-lei1,2, ZHANG Ying1, DING Guo-dong1,2,ZHAO Yuan-yuan1,2, PENG Le1,2   

  1. 1 Key Laboratory of State Forestry Administration on Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China; 2 Yanchi Ecology Research Station of the Mu Us Desert,Yanchi 751500,Ningxia,China
  • Received:2019-01-10 Revised:2019-03-29 Online:2019-09-25 Published:2019-09-18

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摘要： 为揭示毛乌素沙地风沙土粒径分布特征，推测其影响因素，以毛乌素沙地流动、半固定和固定沙丘风沙土为研究对象，利用激光衍射技术分析其粒度组成，并计算粒度参数，解析粒配曲线，研究结果表明：（1） 毛乌素沙地风沙土优势粒径组为细砂，其平均体积含量约为29.89%～32.46%，不同类型沙丘无显著差异（P>0.05）；少数粒径组分为粗砂、黏粒和极粗砂，其中流动沙丘与半固定、固定沙丘黏粒与粗砂含量均无显著差异（P>0.05），从半固定到固定沙丘，黏粒含量显著增加（P<0.05），粗砂含量显著减小（P<0.05），从流动沙丘到固定沙丘，极粗砂含量显著减小（P<0.05）。（2） 毛乌素沙地风沙土平均粒径为3.35 Φ，粒度分布集中，分选性较差，偏度状况为正偏，尖窄峰态。在沙丘固定的过程中，平均粒径与标准偏差无显著变化（P>0.05），峰态显著变宽平（P<0.05），半固定沙丘偏态值与其他2种沙丘相比显著偏负（P<0.05）。（3） 流动、半固定与固定沙丘跃移组分的粒径区间分别为44～435 μm、63～500 μm和31～354 μm，风沙运动在半固定沙丘中最为强烈。毛乌素沙地风沙土优势粒径组分含量主要受物源影响，少数粒径组分含量主要受沙丘流动性影响，风沙运动强度随沙丘的固定呈先增大后减小的规律。

关键词: font-size:10.5pt, 粒径分布； 粒度参数； 风沙运动； 粒配曲线； 毛乌素沙地')">">粒径分布； 粒度参数； 风沙运动； 粒配曲线； 毛乌素沙地

Abstract:  

To reveal the characteristic of particle size distribution (PSD) of Aeolian soils and the influence factors at the Mu Us Sandy Land,which is between Shaanxi Province and Inner Mongolia,China,the soil PSD were identified from the mobile,semi-fixed and fixed dunes using laser diffraction technique.Subsequently,soil PSD parameters and curves were calculated including average particle size,standard deviation,skewness,kurtosis and frequency distribution and cumulative curves.The results indicated as follows: (1) fine sand was the dominative group accounting for 29.89% up to 32.46% of the total volume in the Mu Us Sandy Land and there were no significant differences between different types of dunes (P >0.05).Accordingly,coarse sand,clay and extreme coarse sand were much less.For clay and coarse sand,there was no significant difference between mobile,semi-fixed and fixed dunes (P >0.05).However,the content of clay particles was increased significantly and the content of coarse sand was decreased significantly from semi-fixed and fixed dunes (P <0.05).Furthermore,the content of extreme coarse sand was significantly decreased from mobile and fixed dunes (P <0.05).(2) The average particle size was 3.35 Φ in the Mu Us Sandy Land.Soil particle size distributions were centralized,which reflected a poor sorting capability,a very positive skewness and sharp kurtosis.During the sand dune fixation,there was no significant difference in average particle size and standard deviation (P>0.05).Nevertheless,kurtosis became significantly wider (P<0.05).For the semi-fixed dunes,the skewness was inclined to negative if compared with the other two types of dunes.(3) The particle size of the saltation in the mobile,semi-fixed and fixed dunes was 44-435,63-500 and 31-354μm,respectively,which indicated strongest Aeolian movement in the semi-fixed dunes.In the Mu Us Sandy Land,the dominative particles were primarily affected by sand source,while the minorities were mainly influenced by the mobility of sand dunes.The intensity of sand transport was growing first and then reducing as the sand dune got fixation.This information from this study will contribute to reveal the sand transport during the sand dune fixation,and provide firm basis for ecological restoration in desertified areas.

Key words: particle size distribution')">particle size distribution, particle size parameter, Aeolian sand transport, particle grading curve, Mu Us Sandy Land