Sand-fixation Effect and Micro-mechanism of Remixing Soil by Pisha Sandstone and Sand in the Mu Us Sandy Land, China

doi:10.7522/j.issn.1000-694X.2017.00020

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (3): 421-430.DOI: 10.7522/j.issn.1000-694X.2017.00020

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Sand-fixation Effect and Micro-mechanism of Remixing Soil by Pisha Sandstone and Sand in the Mu Us Sandy Land, China

Li Yurui¹, Fan Pengcan^1,2, Cao Zhi^1,2, Chen Yufu¹, Liu Yansui^1,3, Wang Huanyuan⁴, Liu Huaihua⁵, Ma Feng⁶, Wan Hui⁶

1. Key Laboratory of Degraded and Unused Land Consolidation Engineering, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. College of Land and Urban-Rural Development, Beijing Normal University, Beijing 100875, China;
4. Shaanxi Land Construction Group, Xi'an 710075, China;
5. Yulin Academy of Agricultural Science, Yulin 719000, Shaanxi, China;
6. Yulin Meteorological Bureau, Yulin 719000, Shaanxi, China

Received:2016-12-19 Revised:2017-04-28 Online:2017-05-20 Published:2017-05-20

Abstract

Abstract: As the core technology and engineering of remixing soil by Pisha sandstone and sand have been presented, there are new ideas and technology supports for rational utilization of land resources and the construction of ecological civilization in a scientific way in the Mu Us Sandy Land. More attention had been paid on technology problems of utilization in previous studies, and remarkable progress had been made. But there still need to strengthen the study of sand-fixation effect and micro-mechanism of remixing soil by Pisha sandstone and sand. This paper aims to exploring the sediment transport volume of typical sand in the Mu Us Sandy Land and remixing farmland and its micro-mechanism based on 8-directional sand collector, scanning electron microscope (SEM) and laser particle size analyzer (LPSA). The results show that: (1) During the whole observation period, the sediment transport volume of the remixing farmland of Pisha sandstone and original sand was 2 436 g, which was only a half of that of original sand (4 951 g). This indicated that the remixing farmland of Pisha sandstone and original sand has the function of sand-fixation. (2) SEM observation showed that soil aggregate began to emerge in the remixing artificial soil, while in the sandy soil, there was still no bond and soil aggregate and the sand particles were fragmental. (3) LPSA analysis showed that the silt content and clay content only accounted for 2.74% in sand, while this percentage increased to 15.12% in remixing artificial soil. So we can infer that the sand stabilization is closely related with soil structure and the silt and clay content in soil. According to the sand-fixing effects of compound soil by mixing sandstone and sand, suitable grass or shrub belt with windproof function should be constructed in the upper regions of dominant wind direction in the first three or four years of projects implementation.

Key words: Pisha sand stone, sand, artificial soil by remixing soft land and sand, sand fixing effects, sand collector, micro-mechanism, Mu Us Sandy Land

CLC Number:

S156

Li Yurui, Fan Pengcan, Cao Zhi, Chen Yufu, Liu Yansui, Wang Huanyuan, Liu Huaihua, Ma Feng, Wan Hui. Sand-fixation Effect and Micro-mechanism of Remixing Soil by Pisha Sandstone and Sand in the Mu Us Sandy Land, China[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(3): 421-430.

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Sand-fixation Effect and Micro-mechanism of Remixing Soil by Pisha Sandstone and Sand in the Mu Us Sandy Land, China

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