Meanwhile, there were not significant differences in wood air dry density, mechanical strength and cell wall percentage of intra provenance.

种源内木材气干密度、力学强度及胞壁率差异不显著，管胞长、宽和壁厚的差异均显著且高于种源间的差异。

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The upper level dry and cold air with high moist potential vorticity value was superposed to the low-level disturbance, which was advantageous to instability stratification strength and precipitation.

高空具有高湿位势涡度值的干冷空气叠加在低层扰动上，有利于不稳定层结的加强和降水发生。

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