天目山国家级自然保护区柳杉群落空气负离子浓度日变化特征

研究距离景区饭店不同的柳杉Cryptomeria fortunei群落空气负离子浓度及其与环境因子的关系。选择初夏和盛夏晴天,同步测定2种柳杉群落内空气负离子浓度及其环境因子。结果表明：①一里亭柳杉群落的空气负离子浓度明显高于竹祥山庄,在测定日出现2～3个峰值;②一里亭柳杉群落空气清洁度优于竹祥山庄柳杉群落;③初夏测定日,风速对一里亭柳杉群落空气负离子浓度的影响顺序上升至第3位,而可吸入颗粒物对竹祥山庄柳杉群落空气负离子浓度的影响顺序上升至第3位;盛夏测定日,光量子是影响一里亭和竹祥山庄柳杉群落空气负离子浓度的主要因子。

Diurnal changes in the negative ion concentration of the air for two Cryptomeria fortunei communities of National Nature Reserve of Mount Tianmu

To study the diurnal changes in negative air ion concentration and their relationships with envi-ronmental factors within two Cryptomeria fortunei communities,growing at Yiliting and Zhuxiang Resort,in the Mount Tianmu Nature Reserve,measurements were made with an air ion measuring instrument,a mi-crocomputer laser dust collecting instrument,and a temperature-humidity recorder. Then,diurnal variations （8 ：00 -17 ：00） were monitored simultaneously during sunny days in summer of 2006 with a gray se-quence analysis between negative air ions and 1） particle matter with aerodynamic diameter 〈10 μm （PM10）, 2） relative humidity, 3） air temperature, 4） wind speed and 5） photons. Results showed that 1） the negative ion concentration in the air for Yiliting was significantly higher than （P〈0.001 during sunny days in early and mid-summer of 2006 respectively） Zhuxiang with two or three peaks during a day. Also, 2） air cleanness degree for Yiliting was superior to Zhuxiang. Lastly, 3） The sequence of the affection on the negative ion concentration by environment factors on a sunny day in early summer for C. fortunei community near Yiliting was air relative humidity〉air temperature〉wind speed. But in midsummer C. fortunei community near Zhuxiang, the sequence of the affection on the negative ion concentration by environment factors was air relative humidity 〉air temperature 〉PM10. For measurements on a day in midsummer, the most important meteorological factor affecting the negative ion concentration of the air in Yiliting and Zhuxiang was photons.