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在2011年秋、冬季和2012年春、夏季的游憩时段内(5:00—19:00),对无锡惠山香樟林、湿地松林和栓皮栎林3种游憩林内PM2.5质量浓度进行实时监测,并同步观测气象因子,分析了游憩林内PM2.5浓度的时间变化规律及其影响因素.结果表明:惠山3种游憩林内PM2.5浓度年均值低于道路,湿地松林和香樟林内PM2.5浓度年均值低于栓皮栎林;3种游憩林和道路的PM2.5年均浓度低于无锡市背景值.游憩林内PM2.5浓度的季节变化规律为夏季最低,秋季次之,春季最高;PM2.5浓度在春、夏、冬季最低的是湿地松林,秋季最低的是香樟林,栓皮栎林在各季节的PM2.5浓度都较高.PM2.5浓度在四季的日变化近似于“单峰单谷”型,7:00—9:00和15:00—19:00各出现最大值和最小值.4个季节的湿度和温度与PM2.5浓度均极显著相关,光照仅在冬季显著影响PM2.5浓度,较小风速对PM2.5浓度的影响不大.
The PM2.5 concentrations in three recreational forests of Huishan camphora, Pinus elliottii and Quercus variabilis forest in Wuxi were monitored in real time during the autumn and winter 2011, spring 2012 and summer recreation periods (5: 00-19: 00) The temporal variation of PM2.5 concentration in the recreational forest and its influencing factors were analyzed.The results showed that the annual average concentration of PM2.5 in the three kinds of recreational forest was lower than that of the PM2.5 in the road, Pinus elliottii and camphora The average annual concentrations of PM2.5 in the three types of recreation forests and roads were lower than those in the urban forests. The seasonal variation of PM2.5 concentrations in the recreation forests was the lowest in summer, the second highest in autumn and the highest in spring. The lowest PM2.5 concentrations in spring, summer and winter were Pinus elliottii and the lowest in autumn was the camphor forest, while the PM2.5 concentrations in the cortex oak forest were higher in all seasons.The diurnal variation of PM2.5 concentration in the four seasons was similar to “Monopole Valley ” type, 7: 00-9: 00 and 15: 00-19: 00 each appear the maximum and minimum value.The 4 seasons humidity and temperature and PM2.5 concentration are extremely significant correlation, Light only affected PM2.5 concentration significantly in winter, while smaller wind speed had little effect on PM2.5 concentration.