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Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (2): 37-46.DOI: 10.7522/j.issn.1000-694X.2024.00140

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The impact of vegetation factors of three vegetation communities on aeolian sand factors in the Ulan Buh Desert

Yuxuan Cao1,2(), Jinrong Li2(), Xu Yang3, Namahan1,2, Hengbo Wu1,2, Pengcheng Qu1,2   

  1. 1.Institute of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China
    2.Yinshanbeilu National Field Research Station of Steppe Eco-hydrological System,China Institute of Water Resources and Hydropower Research,Beijing 100038,China
    3.Inner Mongolia Autonomous Region Water Conservancy Development Center,Hohhot 010020,China
  • Received:2024-08-22 Revised:2024-09-29 Online:2025-03-20 Published:2025-03-26
  • Contact: Jinrong Li

Abstract:

This study aims to investigate the effects of different plant community types on wind speed and sediment transport in the Ulan Buh desert area. Three typical vegetation communities with Haloxylon ammodendronZygophyllum xanthoxylumTetraena mongolica, and Ammopiptanthus mongolicus as the dominant species were selected for wind and sand dynamic observations. The research results show that the roughness coefficient Z0 of vegetation communities is related to the vegetation coverage c, vegetation height h, and wind speed UZ by the function Z0=a0ch+b0UZ +c0 (where a0>0 and b0<0). The sediment transport rate can be described by the exponential function model Q=exp(a1ch+b1v2 +c1), where the wind speed v, vegetation factors, and sediment transport rate Q are related. Wind speed, as a key factor affecting roughness and sediment transport rate, is negatively correlated with roughness and positively correlated with sediment transport rate. Vegetation factors are positively correlated with roughness and negatively correlated with sediment transport rate. By establishing a multi-factor comprehensive relationship, it is possible to more accurately analyze the effects of plant community wind and sand movement, where the sediment transport rate changes with the influence factors in an exponential function manner. The coefficients of the fitting results and the contribution rates of the influencing factors can be used as quantitative indicators to evaluate the influence range of vegetation factors on roughness and sediment transport rate. In the Ulan Buh desert along the Yellow River, the Zygophyllum xanthoxylum+Tetraena mongolica community with a tight underlying surface structure has the most significant effects on roughness and sediment transport rate compared to other communities.

Key words: vegetation communities, sediment transport rates, aerodynamic roughness, Ulan Buh Desert

CLC Number: