Relationship between the desertification risk index and blowing sand content of typical aeolian erosion areas in Sanjiangyuan

XU Mengzhen; LI Yanfu; LI Zhiwei; WANG Zhaoyin; HAN Lujie

doi:10.16511/j.cnki.qhdxxb.2017.25.001

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (4) : 337-344. DOI: 10.16511/j.cnki.qhdxxb.2017.25.001

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Relationship between the desertification risk index and blowing sand content of typical aeolian erosion areas in Sanjiangyuan

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Abstract

Field investigations and samplings in typical aeolian erosion areas in Sanjiangyuan were taken to study the features of sediment particles. The sediment composition distributions of active, semi-fixed, and fixed sand dunes were analyzed to identify the components of blowing sand when eroded by wind. The content of the blowing sand then influences the desertification. A desertification risk index which indicates the risk of desertification for an area was defined and applied to assess the desertification risk of the aeolian erosion areas. The desertification risk index of the sampled areas was correlated with the blowing sand percentage. Desertification is unlikely when the blowing sand percentage was less than 50%, with the desertification risk increasing exponentially as the blowing sand percentage increased for percentages over 60%. Therefore, the blowing sand percentage is recommended as an index for indicating the desertification risk of a region. Strategies to reduce the proportion of blowing sand and promoting vegetation coverage are recommended for preventing desertification in the Sanjiangyuan region.

Key words

Sanjiangyuan / desertification risk index / blowing sand / grain size distribution / mineral composition

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XU Mengzhen, LI Yanfu, LI Zhiwei, WANG Zhaoyin, HAN Lujie. Relationship between the desertification risk index and blowing sand content of typical aeolian erosion areas in Sanjiangyuan[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(4): 337-344 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.001

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