玉米花粉干沉降通量空间分布特征的初步研究

Preliminary Research on Spatial Distribution Characteristics of Dry Deposition Flux of Maize Pollen

为了全面了解不同大气层结条件下,玉米花粉沉降在水平和垂直方向上的分布规律,笔者利用开花期玉米花粉干沉降试验和微气象观测资料,分析了源区外花粉干沉降通量的空间分布特征。结果表明,水平方向上,源区外干沉降通量随着与正下风方向夹角的增大呈递减趋势,且随距源区距离的增加,呈明显的指数递减规律,6、10m分别为花粉干沉降通量在稳定层结和不稳定层结条件下的拐点;垂直方向上,玉米花粉干沉降通量随高度递减,冠层高度以上中性层结条件下,花粉的干沉降通量无明显的增减变化。

In order to make fully understood the distribution of maize pollen deposition on the horizontal and vertical orientations in different atmospheric stratification conditions,the maize pollen dry deposition flux spatial distribution out of the source was analyzed on the basis of the experiment of maize pollen dry deposition test and the corresponding microclimatology observation,and some critical analytical results were found.On the horizontal orientation,the pollen dry deposition flux decreased with the angle increasing between the observation direction and prevailing wind direction,and exponential decreased along with the increasing distance from the source,the inflection distances of dry deposition flux decrease at stable and unstable stratification were 6 m and 10 m respectively.On the vertical orientation,the pollen dry deposition flux decreased with the height.There were no obvious increase or decrease changes of maize pollen dry deposition flux above the heights of canopy at the stable stratification.