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使用多尺度分析方法分析了长白山阔叶红松林林冠大气界面湍流交换的主导时间尺度特征及相应的作用系数特征及大气层结和林冠结构的影响。发现:水平风速的DTS大于垂直风速的相应值,垂直风速的DCR大于水平风速的DCR。大气层结影响是非线性的。不稳定层结条件下的DTS和DCR大于稳定层结下。在强稳定层结和强不稳定层结条件下,DTS和DCR主要取决于来流特征。生长季节各高度DTS的变化规律较为复杂且不一致,非生长季节各高度具有一致的变化。不稳定层结条件下的生长季节水平风速DTS大于非生长季节;林冠结构可以显著影响主导时间尺度和主导过程贡献率。图2表1参15。
The multi-scale analysis method was used to analyze the dominating time-scale features of turbulent exchange at the canopy interception of the broad-leaved Korean pine forest in Changbai Mountains and their corresponding effect coefficient characteristics and the influence of the atmosphere layer structure and canopy structure. It is found that the horizontal wind speed DTS is larger than the vertical wind speed, and the vertical wind speed DCR is greater than the horizontal wind speed DCR. The impact of the atmosphere is nonlinear. DTS and DCR under unstable stratification conditions are greater than those under stable stratification. DST and DCR mainly depend on the characteristics of incoming flow under strong and strong instability stratification. The variation of DTS at each height during the growing season is more complicated and inconsistent, with consistent changes in all non-growing seasons. The mean wind speed (DTS) in growing season under unstable stratification conditions was higher than that in non-growing season. The canopy structure could significantly influence the dominance time-scale and the contribution rate of dominant process. Figure 2 Table 1 参 15.