Topsoil Grain Size Distribution and Its Sedimentary Environment in Desert-oasis Transitional Zone of Dunhuang City

ZHANG Yu; ZHANG Kecun; AN Zhishan; CAI Diwen

doi:10.13961/j.cnki.stbctb.2017.04.012

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Topsoil Grain Size Distribution and Its Sedimentary Environment in Desert-oasis Transitional Zone of Dunhuang City

- Topsoil Grain Size Distribution and Its Sedimentary Environment in Desert-oasis Transitional Zone of Dunhuang City
- Bulletin of Soiland Water Conservation Vol. 37, Issue 4, Pages: 69-73(2017)
- 作者机构：
  
  1. 中国科学院西北生态环境资源研究院沙漠与沙漠化重点实验室敦煌戈壁荒漠生态与环境研究站甘肃省风沙灾害防治工程技术研究中心,甘肃,兰州,730000
  2. 中国科学院大学,北京,100049
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2017.04.012
  CLC：
- Published：2017
- 稿件说明：
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ZHANG Yu, ZHANG Kecun, AN Zhishan, et al. Topsoil Grain Size Distribution and Its Sedimentary Environment in Desert-oasis Transitional Zone of Dunhuang City[J]. Bulletin of Soiland Water Conservation, 2017, 37(4): 69-73.
DOI：

ZHANG Yu, ZHANG Kecun, AN Zhishan, et al. Topsoil Grain Size Distribution and Its Sedimentary Environment in Desert-oasis Transitional Zone of Dunhuang City[J]. Bulletin of Soiland Water Conservation, 2017, 37(4): 69-73. DOI： 10.13961/j.cnki.stbctb.2017.04.012.

摘要

[目的]探究敦煌沙漠绿洲过渡带地表沉积物粒度特征及沉积环境，为敦煌沙漠绿洲过渡带的生态恢复以及有效控制风沙灾害提供必要的理论依据。[方法]运用对角线法对敦煌沙漠绿洲过渡带地表沉积物进行采样，采用矩值法计算粒度参数，分析其粒度空间分布特征以及沉积环境。[结果]（1）研究区地表沉积物粒级极粗砂和极细砂含量较少，沙漠和绿洲分别以粗砂和细砂为主，过渡带以中砂为主，沉积物粒径自沙漠到绿洲呈现明显减小的趋势；（2）3条样带的分选性都较好，相比而言，沙漠的分选性最好，过渡带次之，绿洲最差；（3）偏态除绿洲属于正偏外，沙漠和过渡带都属于近对称分布，频率曲线峰型都是平顶峰，说明不同沉积物粒级对风力作用响应的差异性。[结论]敦煌绿洲的沙以风成环境为主，鸣沙山主要为河湖沙或河流冲积沙，过渡带混合有风成沙和河湖或河流冲积沙。

Abstract

[Objective] Exploring the topsoil grain size distribution and its sedimentary environment

to provide theoretical bases for ecological restoration and effective sand disasters control in the Dunhuang desert-oasis transitional zone.[Methods] Surface sediments were sampled by diagonal method in Dunhuang desert-oasis transitional zone

Grain size parameters were calculated by moment method. The spatial distribution and sedimentary environment of grain size were analyzed.[Results] (1) The contents of extremely coarse sand and extremely fine sand were both low in the research area. Desert and oasis were mainly composed of coarse sand and fine sand

and the transition zone was dominated by mid-sand. The grain size decreased from desert to oasis. (2) The sorting of the 3 sampling belt transects performed all better

among which

the desert was the best

followed by the transition zone

the oasis was the worst. (3) As for skewness

desert and transition zone were nearly symmetrical distribution

while oasis belonged to positive skewness. Kurtosis type was plat

which showed that responses of different sediment grain sizes to wind power were different.[Conclusion] The sand of oasis is dominated by aeolian environment

Mingsha mountain is mainly lacustrine or river environment

two different sedimentary sands appeared in the transitional zone.

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