Field measurements of airborne concentration and deposition rate of maize pollen

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• 作者：Jarosz ; Nathalie ; Loubet ; Benjamin ; Durand ; Brigitte ; McCartney ; Alastair ; Foueillassar ; Xavier ; et. al.
• 关键词：Maize ; Pollen ; Particle dispersion ; Concentration profile ; Deposition velocity ; Aerobiology
• 刊名：Agricultural and Forest Meteorology
• 出版年：2003
• 出版时间：October 30, 2003
• 年：2003
• 卷：119
• 期：1-2
• 页码：37-51
• 全文大小：418 K

文摘

In recent years there has been interest in the dispersal of maize (Zea mays) pollen from crops, particularly in relation to gene flow and seed quality. We report the results of experiments that measured maize pollen dispersal from a 20m×20m experimental crop. The experiments were done in a commercial farm in France during the summer of 2000. Pollen production was estimated to range from 10⁴ to 2×10⁶ grains per day per plant. Pollen concentrations and deposition rates decreased rapidly with distance from the crop: concentrations decreased by about a factor of 3 between 3 and 10m downwind of the source; deposition rates at 30m were <10 % of those at 1m. Horizontal flux of pollen were estimated from pollen concentration and wind speed profiles using a mass balance approach, and ranged from 15 to 560grainsm⁻¹s⁻¹ at 3m from the source. Comparison of deposition rates estimated with the mass balance and direct measurement suggests that only a small proportion of the pollen released from the crop would have been still airborne at distances greater than 30m downwind. Deposition velocity determined as the ratio of the deposition rate to the airborne concentration at 3m from the source averaged 0.6ms⁻¹, which is twice as large as the settling velocity for maize pollen.