Daily Variation of Negative Air Ions Concentration in the Coniferous Forest in Mohe County

doi:10.11924/j.issn.1000-6850.casb15050146

Abstract

Abstract: Relationships between the negative air ions concentrations in the Pinus sylvestris var. mongolica and Larix gmelini and environmental factors, such as different seasons, locations, humidity or temperature, etc, in each day were analyzed, in order to investigate the daily variation of negative air ions concentrations in Mohe County. The samplings were measured in the sampling areas of 100 m2 in summer and autumn in 2012 and 2013, respectively. The results showed that the daily negative air ions concentration in coniferous forest was 1155 ions/cm³ at 12:00 AM which was the highest, and was 254 ions/cm³ at 2:00 AM which was the lowest. The coniferous forest negative air ions concentration in summer was higher than that in autumn. The average level of the negative air ions concentration in Larix gmelini was higher than that in Pinus sylvestris var. mongolica. The density of negative air ions concentration in the forest edge was slightly higher than that in the forest center. The correlation analysis showed that negative air ions concentration in coniferous forest was positively correlated with air temperature, but was negatively correlated with air humidity. Therefore, the negative air ions concentration can not only be an evaluated index of air cleaning level, but also an important parameter to measure the quality of the environment.

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