漠河针叶林空气负离子浓度日变化特征研究

为探明大兴安岭针叶林空气负离子浓度日变化特征，选择2012年、2013年的夏、秋2季，于漠河北极村附近分别选取100m2的樟子松、落叶松林地，测量并分析2处样地的空气负离子浓度与季节、测量点位置和温湿度等环境因子在日变化上的相互关系。研究表明，针叶林空气负离子日平均浓度在中午12时达到峰值，为1155个/cm³，在凌晨2时达到谷值，为254个/cm³，夏季针叶林空气负离子平均浓度高于秋季。落叶松林地空气负离子浓度平均水平高于樟子松林地。空气负离子浓度在林地边缘密度略大于林地中心。通过相关分析，针叶林地空气负离子浓度与空气温度呈极显著正相关，与空气湿度呈显著负相关。空气负离子浓度不仅可以评价空气清洁水平，也是衡量环境质量的重要参数。

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

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 negative air ions concentration in Larix gmelini was higher than that of the average level of the Pinus sylvestris var. mongolica. Negative air ions concentration in the forest edge density was slightly higher than that in the forest center. The correlation analysis showed that negative air ions concentration in coniferous forest and air temperature were positively correlated, and which was negatively correlated with air humidity. It is showed that negative air ions concentration can be not only an evaluated index of air cleaning level, but also an important parameter to measure the quality of the environment.