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通过对北京市元大都公园内所选样地空气微生物浓度的全年测定,得出了城市绿地空气微生物浓度年变化基本上呈双峰曲线,10-11月和5-6月浓度较高,7-9月相对较低。日变化秋季、春季、夏季各不相同,秋季呈逐步下降趋势;春季呈“U”型;夏季呈双峰型。城市绿地减菌效应比较显著的时间在6-10月,尤其以7、8、9月最为显著。
Through the annual measurement of the concentration of airborne microbes in the selected sample plots in Beijing’s Yuan Dadu Park, it was concluded that the annual variation of airborne microbial biomass in urban greenbelt basically presented a bimodal curve, with a higher concentration in October-November and May-June, July-September is relatively low. The diurnal variation varied in autumn, spring and summer, with a gradually decreasing trend in autumn, a “U” pattern in spring and a bimodal pattern in summer. Urban green by reducing bacteria more significant time in June-October, especially in July, August and September the most significant.