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1.23 m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。
Abstract
Based on the data of threedimensional 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 zeroplane 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 nongrowing 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.
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参考文献
[1]于贵瑞,孙晓敏. 陆地生态系统通量观测的原理与方法[M]. 北京:高等教育出版社,2006. [2]周艳莲,孙晓敏,朱治林,等. 几种不同下垫面地表粗糙度动态变化及其对通量机理模型模拟的影响[J]. 中国科学:D辑. 地球科学,2006,36(S1):244-254. [3]周艳莲,孙晓敏,朱治林,等. 几种典型地表粗糙度计算方法的比较研究[J]. 地理研究,2007,26(5):887-896. [4]Bosveld F C. Derivation of fluxes from profiles over a moderately homogeneous forest[J]. Boundary Layer Meteorology,1997,84:289-327. [5]何奇瑾,周广胜,周莉,等. 盘锦芦苇湿地空气动力学参数动态特征及其影响因素分析[J]. 气象与环境学报,2007,23(4):7-12. [6]赵晓松,关德新,吴家兵,等. 长白山阔叶红松林的零平面位移和粗糙度[J]. 生态学杂志,2004,23(5):84-88. [7]张一平,宋清海,于贵瑞,等. 西双版纳热带季节雨林风时空变化特征初步分析[J]. 应用生态学报,2006,17(1):11-16. [8]韩素芹,刘彬贤,解以扬. 利用255m 铁塔研究城市化对地面粗糙度的影响[J]. 气象,2008,34(1):54-58. [9]Tsai J L, Tsuang B J. Aerodynamic roughness over an urban area and over two farmlands in a populated area as determined by wind profiles and surface energy flux measurements[J]. Agricultural and Forest Meteorology, 2005, 132: 154-170. [10]Pruegera J H, Kustasb W P, Hipps L E, et al. Aerodynamic parameters and sensible heat flux estimates for a semiarid ecosystem[J]. Journal of Arid Environments, 2004, 57: 87-100. [11]张宏升,陈家宜. 非单一水平均匀下垫面空气动力学参数的确定[J]. 应用气象学报,1997,8(3):310-315. [12]陈家宜,王介民,光田宁. 一种确定地表粗糙度的独立方法[J]. 大气科学,1993,17(1):21-26. [13]Martano P. Estimation of surface roughness length and displacement height from singlelevel sonic anemometer data[J]. Journal of Applied Meteorology, 2000, 39: 708-715. [14]刘和平,刘树华,朱廷曜,等. 森林冠层空气动力学参数的确定[J]. 北京大学学报:自然科学版,1997,33(4):522-528. [15]Rotach M W. Determination of the zero plane displacement in an urban environment[J]. Boundary Layer Meteorology,1994,67:187-193. [16]姜志林. 下蜀森林生态系统定位研究论文集[C]. 北京:中国林业出版社,1992. [17]王国兵. 北亚热带次生栎林与火炬松人工林土壤碳动态研究[D]. 南京:南京林业大学,2008. [18]Wyngaard J C, Izumi Y, Collins S A. Behavior of the refractive index structure parameter near the ground[J]. Journal of the Optical Society of America, 1971, 61: 1646-1650. [19]Shaw R H, Pereira A R. Aerodynamic roughness of a plant canopy: a numerical experiment[J]. Agricultural Meteorology, 1982, 26: 51-65. [20]董治宝,Donald W F,高尚玉. 直立植物防沙措施粗糙特征的模拟实验[J]. 中国沙漠,2000,9(3):260-263.
基金
收稿日期：2009-12-18修回日期：2010-05-12基金项目：国家林业局“948”项目(2006-4-20)作者简介：张学仕(1984—)，硕士生。*薛建辉(通信作者)，教授。Email: jhxue@njfu.edu.cn。引文格式：张学仕,蒋琰,薛建辉,等. 江苏句容下蜀次生栎林的空气动力学参数研究
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