基于拉格朗日随机游走模型的水稻花粉扩散模拟  

Pollen diffusion simulation of rice based on Lagrange random walk model

作　　者：王勇 WANG Yong(Hezhou Meteorological Bureau,Guangxi Hezhou 542899,China)

机构地区：[1]贺州市气象局,广西贺州542899

出　　处：《气象研究与应用》2024年第3期111-116,共6页Journal of Meteorological Research and Application

基　　金：贺州市科学研究与技术开发计划项目(贺科技202210)。

摘　　要：根据5m×5m(T1)、10m×10m(T2)和15×15m(T3)的花粉源尺寸,利用基于拉格朗日随机游走的水稻花粉扩散模型研究水稻花粉在花粉源区的沉降量和面源花粉浓度累加值。结果表明:(1)花粉沉降量的实测值与模拟值之间的相关性较好,对于优化后的拉格朗日随机游走水稻花粉扩散模型切实可行。(2)水稻花粉沉降量一开始先急剧上升,之后保持平稳缓慢增加,在源区外呈负指数形式规律递减。随着花粉源尺寸增大,风对水稻花粉扩散的影响更显著,即风对大尺寸花粉源相比于小尺寸的花粉源影响更大。(3)随着花粉源尺寸的增大,花粉面源的浓度累加值是增大的,这种变化的趋势是先急剧增加然后逐渐趋于平缓。Based on the pollen source sizes of 5m×5m(T1),10m×10m(T2)and 15×15m(T3),the sedimentation of rice pollen in the pollen source area and the cumulative values of non-point pollen concentration were studied by using the Lagrange random walk-based rice pollen diffusion(LRWRPD)model.The results were as follows:(1)the correlation between the measured and simulated values of pollen deposition was good,which was feasible for the optimized LRWRPD model.(2)Pollen sedimentation of rice increased sharply at first,then increased steadily and slowly,and decreased in negative exponential form outside the source area.With the increase of the size of pollen source,the effect of wind on rice pollen diffusion was more significant,that is,the effect of wind on large-size pollen sources was greater than that of small pollen sources.(3)With the increase of the size of pollen source,the cumulative value of the concentration of pollen non-point source increased,and the trend of this change was to increase sharply and then gradually smooth out.

关 键 词：花粉浓度 水稻花粉扩散 花粉源尺寸 花粉沉降 

分 类 号：P49[天文地球—大气科学及气象学]