中文摘要：

根据江苏句容下蜀次生栎林气象观测塔30 m处三维超声风温仪1 a的观测资料,应用温度方差方法计算了空气动力学参数,并对其影响因子（风向、风速、摩擦风速和叶面积指数（LAI））进行了分析。研究结果表明,零平面位移d和粗糙度Z0都具有明显的随着植被生长先增大后减小的季节变化趋势,两者生长季的平均值为15.20 m和1.86 m,非生长季为14.25 m和1.24 m。d随风向无太大变化,Z0在90°~180°和300°~30°的主风向上有显著变化,平均值分别为1.23m和1.81 m。Z0随风速增大而减小,当风速增大到一定程度后Z0随风速的变化较小,而Z0随着摩擦风速的增大而变大。d随LAI增大而增大,Z0也随LAI增大而增大,当LAI增大到一定值时,Z0随着LAI的增大而变化不大。根据有效数据比分析表明,TVM法中的系数C3取3.5、C1取0.9~1.05较合适。

英文摘要：

Based on the data of three-dimensional ultrasonic anemometer on the 30 m of micrometeorological tower at secondary oak forest of Xiashu in period of 2008.03—2009.02,zero plane displacement d and roughness length Z0 were calculated with temperature variance method（TVM） and the impact factors such as wind direction,wind velocity,friction velocity and leaf area index LAI were analyzed.The results showed that both the zero-plane displacement d and the roughness length Z0 both obviously increased and then decreased as the crown leaves growth and then defoliated.The average d and Z0 were 15.20 m and 1.86 m in growing season and 14.25 m and 1.24 m in non-growing season.d did not change a lot in different wind directions,while Z0 obviously changed in two main wind direction 90°—180° and 300°—30° with average Z0 value 1.23 m and 1.81 m respectively.Z0 decreased with increasing wind velocity or increased with increasing friction velocity,while it changed a little when wind velocity increased to a certain value.d and Z0 both increased with increasing LAI,while Z0 had a small change when LAI increased to a certain value.According to the effective data ratio,it was appropriate that the coefficients of TVM C3evaluated 3.5 and C1 evaluated 0.9 to 1.05.