Abstract:Using the vorticity-related data collected from the gradient observation tower in the Wuying Forest Ecological Monitoring Station of China Meteorological Administration, this paper addresses the turbulence characteristics of the underlying surface of the forest (turbulence intensity, turbulence variance, etc.), and calculates the zero-plane displacement （d）, the roughness length （z0） and the momentum drag coefficient （CD）. The results indicate that southwest wind prevails almost throughout the year, with northeast wind only in summer. The tubulence intensity during the growing season (May-September) is stronger, turbulence intensity during the non-growing season (October-April) is weaker, the average turbulence intensity of the horizontal wind speed is 0.4, and the vertical wind speed is 0.16. Both d and z0 have obvious seasonal changes, and they consistently show a trend of high in the growing season but low in the non-growing season, with the average values of d and z0 being 18.56 m and 1.21 m, respectively. Under unstable conditions, the standard deviation of wind speed all conforms to 1/3 power similar law; when nearing neutral conditions, the dimensionless three-dimensional wind speed standard deviation σi/u*(i=u,v,w) are 2.81, 2.73, 1.20 in spring; 2.62, 2.53, 1.10 in summer; 2.63, 2.51, 1.14 in autumn; and 2.74, 2.54, 1.17 in winter. The standard deviations of temperature and humidity conform to -1/3 power similar law under unstable conditions, the coefficients for spring fitting are 2.06 and 2.67, 2.45 and 2.18 in summer, 1.94 and 2.85 in autumn, 1.96 and 3.00 in winter, respectively. CD reaches its peak value in weak instability, and the overall average is 9.8×10-3, increasing approximately linearly with roughness.