深圳夏季3种生境城市森林内臭氧浓度变化规律

摘要

于2015年夏季对深圳园山山麓(Foothil)、河谷(River Valey)和山脊(Ridge)等3种典型生境城市森林内的臭氧浓度和气象因子进行昼夜24h同步监测,研究林内臭氧浓度的变化规律及影响因素.结果表明:深圳园山3种生境城市森林内臭氧浓度的小时均值和日最大8h均值都达到了国家一级标准(分别为160,100μg/m3);3个林地的臭氧浓度日均值都高于对照,且Ridge显著高于River Valey和Foothil;林内臭氧浓度的日变化都呈单峰曲线,表现为白天高,夜间低,在15:00~17:00达到最高,在5:00~7:00降到最低;3种林地的臭氧浓度都与温度极显著正相关,与湿度极显著负相关,此外Ridge的臭氧浓度还与风速极显著正相关.总之,深圳园山3种林分内的臭氧浓度符合人们进行森林游憩活动的空气质量要求,基于臭氧浓度,人们在5:00~7:00进行森林游憩最为适宜.%The ozone concentration of 3 typical urban forests growing at foothill, river valley and ridge of Yuanshan Park in Shenzhen were observed for 24 hours in the summer of 2015. At the same time, the meteorological factors were also observed as influencing factors. Our results showed that: The mean value of hourly and 8h maximum ozone concentration in 3 forests were all achieved the primary standard of national air quality standards (160 and 100 μg/m3, respectively). The daily average ozone concentration in 3 forests were all higher than the control with the highest value observed at the ridge. The daily variation of ozone concentration in 3forests all exhibited a single peak curve, with the highest concentration occurring in 15:00~17:00pm, whereas the lowest occurring in 5:00~7:00am. The ozone concentration in each forest was positively related with the temperature and negatively with the relative humidity. Moreover, a positive correlation was noted between the ozone concentration and the wind velocity at the ridge. In conclusion, the air quality in 3urban forests of Yuanshan Park in Shenzhen is consistent with the air quality requirements of forest recreation activities, and the proper time according to the status of ozone is from 5:00 to 7:00 am in summer.