一种等分作物花粉扩散圆形源区的方法

【背景】转基因作物花粉在大气中扩散会引起基因漂流,从而可导致不可预知的环境风险,运用模型预测可评估其花粉扩散状况、定量确定可靠的安全扩散距离。为了应用高斯烟羽模型应用于模拟转基因作物花粉在大气中的扩散浓度,提出了一种如何将半径为R的圆形花粉源区划分成许多等面积小面元的方法。【方法】通过数学推导,首次提出了各等面积面元中心点坐标的计算公式。【结果】根据在中国东北地区吉林省公主岭玉米花粉扩散和基因漂流的试验观测资料,将该公式应用到高斯烟羽扩散模型中,模拟了玉米花粉扩散到源区外不同距离处的浓度,对比花粉扩散模拟值与实测值,两者具有较好的一致性,表明应用该公式模拟花粉扩散能取得令人满意的效果。【结论与意义】分析证明这种推导划分半径为R的圆形花粉源区各面元中心点坐标的计算公式是可靠的,该方法可为应用高斯烟羽模型计算花粉源区内不同位置点单个源强对源区外某一距离处的花粉浓度的贡献提供便利。

A method to divide the circular source area of crop pollen dispersal into equal parts

【Background】As a simple and effective tool,Gaussian plume model is commonly used to calculate the pollen dispersal concentration and determinate the gene flow safety distance. In order to simulate the pollen dispersal concentration of genetically modified crops,the accurate estimation of source strength contribution is essential in Gaussian plume model. 【Method】In this paper,using mathematical derivation,we propose for the first time a method how to divide equally circular pollen source area into lots of smaller parts and identify the center point coordinates of each parts. An example of its application example is given. 【Result】Based on observed data from the maize pollen dispersal and gene flow experiment conducted in Gongzhuling（ Jilin Province,northeast China）,the formula was applied into Gaussian plume diffusion model to calculate the contribution of each small parts＇ pollen source strengths. The maize pollen dispersal concentration at different distances out of the pollen source area was estimated. The simulated and observed values results from these calculations showing a similar values suggest that good agreements,and it showed that the application of the formula to simulate pollen dispersal could obtain satisfactory results and could be appropriate. 【Conclusion and significance】The formula to determine the center point coordinate of each small pollen source area is reliable. This method is useful to improve the convenient calculation of each small source strength contribution to pollen concentration outside of source area with Gaussian plume model.