Abstract: In traditional study, wind velocity, aerodynamic roughness, friction velocity, drag coefficient and other parameters are often used to evaluate the restriction effect of vegetation on wind erosion, but the studies on wind energy dissipation of vegetation using boundary layer displacement thickness and momentum loss thickness are relatively insufficient. In this paper, the windbreak effect of Artemisia ordosica community over different vegetation coverage was quantitatively studied after carrying out a field investigation in southwestern marginal zone of the Mu Us Sandy land. Artemisia ordosica was selected in the study, its initial coverage was 60%, it was artificially decreased down to 50%, 40% and 30%, and the wind velocities at 0.1, 0.5, 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0 m were recorded. When the coverage of Artemisia ordosica community was increased from 30% to 60%, wind profile did not change significantly, and the values of wind profile equation, aerodynamic roughness, boundary layer displacement thickness and momentum loss thickness were similar. As those parameters did not show a regular change with changing vegetation coverage, it is believed that vegetation coverage and windbreak effect of Artemisia ordosica community are similar.

Key words: vegetation coverage, [WTBX]Artemisia ordosica;[WTBZ] windbreak effect, wind profile, boundary layer thickness, Yanchi, Mu Us sandy land
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vegetation coverage, [WTBX]Artemisia ordosica;[WTBZ] windbreak effect, wind profile, boundary layer thickness, Yanchi, Mu Us sandy land
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vegetation coverage, Artemisia ordosica, windbreak effect, wind profile, boundary layer thickness, Yanchi, Mu Us sandy land