Abstract: Based on the observation data from eddy covariance tower and meteorological gradient tower in Panjin reed wetland observation plot, and by the method combined eddy covariance with microclimate gradient observation, two fundamental aerodynamic parameters, i.e., zero-plane displacement (d) and roughness length (z₀ ), were evaluated, with their affecting factors analyzed. The results showed that the method adopted was suitable for estimating the aerodynamic parameters. There existed obvious seasonal variations in d and z₀, with the maximum (1.85 and 0.24 m) in September and the minimum (0.02 and 0.03 m) in December, respectively. The seasonal variations were closely related to vegetation characteristics, plant height (h) and leaf area index (LAI). There was a close linear relationship between d and h, and a conic relationship between z₀ and h. Both d/h and d/z₀ had power relationships with LAI, and the R² values were 0.99 and 0.78, respectively.

Key words: redundancy analysis, Yueqing Bay, niche overlap, niche breadth