Characteristics of grain size variation of dunes surface sediments before and after wandering dune control in Zoige Basin， China

doi:10.7522/j.issn.1000-694X.2023.00178

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (3): 96-107.DOI: 10.7522/j.issn.1000-694X.2023.00178

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Characteristics of grain size variation of dunes surface sediments before and after wandering dune control in Zoige Basin， China

Huicong Meng(), Guangyin Hu(), Zhibao Dong, Weige Nan, Haokun Mo, Jingjing Hu

School of Geography and Tourism，Shaanxi Normal University，Xi'an 710119，China

Received:2023-11-10 Revised:2023-12-26 Online:2024-05-20 Published:2024-06-11
Contact: Guangyin Hu

Abstract

Abstract:

In recent years， various counties in the Zoige Basin have taken measures such as setting checkerboard sand barriers and planting shrubs to control desertification， and many wandering dunes have been fixed. To explore the changes of grain size characteristics of sand dune surface sediments under the influence of sand-fixing vegetation， surface samples were collected before and after sand dune control on the left bank of the Yellow River in Maqu County， Zoige Basin， and the relevant data were compared and analyzed. The results show：（1） After vegetation fixation， the proportion of silt and clay components increased from 1.3% to 9.9%， and the mean particle size decreased from 181.9 μm to 162.0 μm. The grain size components of surface sediments became finer， the sorting of dunes became worse， the skewness changed from near symmetry to very positive skewness， and the kurtosis changed from medium to very narrow. （2） The frequency distribution curve has a secondary peak， and the probability accumulation curve has a sub-component in the suspension section. The overall change from two-stage to three-stage， the particle size of the suspension component becomes finer， and the proportion of the saltation component content decreases from 99% to 87%-88%. （3） Under the combined action of wheat straw grid and sand-fixing vegetation， the effect of desertification control is remarkable， but the local environment of desertification land will also affect the effect of sand control. Therefore， it is necessary to carry out sand control work according to local conditions， pay attention to the dynamic changes of the control area， and timely take measures to adjust.

Key words: combating desertification, grain size characteristics, Zoige Basin, the source region of Yellow River, Tibetan Plateau

CLC Number:

P931.3

Huicong Meng, Guangyin Hu, Zhibao Dong, Weige Nan, Haokun Mo, Jingjing Hu. Characteristics of grain size variation of dunes surface sediments before and after wandering dune control in Zoige Basin， China[J]. Journal of Desert Research, 2024, 44(3): 96-107.

Figures/Tables 7

Fig.1 The distribution of main water systems and the location of sampling areas （A） and sampling points （B） in the Zoige Basin

Fig.2 The surface condition of the sampling point. （A） Fixed dunes after combating desertification， namely MQSQ1， photographed in March 2023；（B） Wandering dunes before combating desertification， namely MQSQ1（Q），photographed in July 2012；（C） Present situation of sand dune surface；（D） Schematic drawing of sampling position of single dune

Table 1 Granularity parameter grading standard

分选系数（σ）		偏度（SK）		峰态（K_g）
范围	描述	范围	描述	范围	描述
<0.35	分选极好	-1.0~-0.3	极负偏	<0.67	很宽
0.35~0.50	分选好	-0.3~-0.1	负偏	0.67~0.90	宽
0.50~0.70	分选较好	-0.1~0.1	近对称	0.90~1.11	中等
0.70~1.00	分选中等	0.1~0.3	正偏	1.11~1.50	窄
1.00~2.00	分选较差	0.3~1.0	极正偏	1.50~3.00	很窄
2.00~4.00	分选差			>3.00	非常窄
>4.00	分选极差

Fig.3 Particle size distribution

Fig.4 Grain size parameter

Fig.5 Grain size frequency distribution curves

Fig.6 Probability cumulative curves

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Characteristics of grain size variation of dunes surface sediments before and after wandering dune control in Zoige Basin， China

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