Driving Mechanism of Sandy Desertification in Guinan, Qinghai, China

doi:10.7522/j.issn.1000-694X.2015.00194

JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (6): 1539-1546.DOI: 10.7522/j.issn.1000-694X.2015.00194

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Driving Mechanism of Sandy Desertification in Guinan, Qinghai, China

Li Xiaoying^1,2, Yao Zhengyi¹, Wang Hongwei^1,2, Xiao Jianhua^1,2

1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2015-07-03 Revised:2015-09-01 Online:2016-11-20 Published:2016-11-20

Abstract

Abstract: The Mugetan dune field in Guinan is the largest continuous dune system in the Gonghe Basin, Qinghai-Tibet Plateau. The modern sandy desertification is derived from reactivation of fossil dunes. However, it is not yet clear how this reactivation has occurred in Guinan. By means of field investigations, interpretation of remote-sensing images, analysis of sedimentary stratigraphy, and grain-size tests, we analyze the current situation of sandy desertification in Guinan and its spatial distribution, the stratigraphic sequence and the grain size of the fossil dune sediments, and proposes a microcosmic explanation for the driving mechanism of sandy desertification. The research results show that the mobile dunes are mainly distributed on the Mugetan. The small scale geomorphology of Mugetan can be divided into two types:the plateau and sandy hills, and about 96.1% of mobile dunes is distributed on the sandy hills, and only 3.9% is distributed in the edge of the plateau. The grain size characteristics of modern mobile dunes and fossil dunes are very similar, showing obvious relationship of inheritance and transformation. Modern mobile dunes is derived from reactivation of fossil dunes. The turf and silty sand are protective layers of fossil dunes. Mechanical destruction of protective layers, leading to exposure of underlying loose sands is the key step that leads to sandy desertification in Guinan. The exposed loose sands are blown out by the wind, and created lateral recession at the bottom of the surface protective layer. When the lateral recession reached a certain depth, turf or silty sand collapsed and accumulated at the foot the scarp. The collapsed materials partly or wholly covered the exposed loose sands. Afterwards, the collapsed materials are eroded and carried away by wind, rain and gravity, and the loose sands exposed again. Alternating of wind erosion and gravity erosion, lead to blowouts expansion and connection, finally, formed mobile dunes.

Key words: Mugetan, sandy desertification, driving mechanism, reactivation of fossil dunes, blowouts

CLC Number:

P931.3

Li Xiaoying, Yao Zhengyi, Wang Hongwei, Xiao Jianhua. Driving Mechanism of Sandy Desertification in Guinan, Qinghai, China[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(6): 1539-1546.

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Driving Mechanism of Sandy Desertification in Guinan, Qinghai, China

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