河北太行山区主要水土保持林空气负离子特征研究

利用空气负离子测定仪（TC-201A型）对河北太行山区五种主要水土保持林的空气负离子浓度进行测定，探讨了不同林分空气负离子浓度的时空变化规律，并进一步分析了空气负离子浓度与气温、湿度和地形等环境因子的关系。结果表明：1）空气负离子浓度日变化总体呈现先降低再升高的趋势，即早上较高、中午较低、下午又逐渐上升；2）空气负离子浓度的月变化为6、7、9月份空气负离子浓度较高，5、8、10月份空气负离子浓度较低；3）空气负离子浓度随着空间高度的增加逐渐减小；4）不同树种林分的空气负离子浓度苹果〉板栗〉栓皮栎〉油松〉刺槐；5）空气负离子浓度与温度之间存在着负相关关系。与湿度之间存在着正相关关系；6）坡中林内的空气负离子浓度大于沟内的，但二者之间的空气负离子浓度差异不显著。

A Study of Negative Air Ion Characteristics in Land and Water Conservation Forests in Taihang Mountain Area, Hebei Province

Negative air ion detector （TC -201A） was used to measure and determine negative air ion concentration in five soil and water conservation forests at Taihang Mountain area of Hebei Province. The spatial and temporal varia- tion regularity of negative air ions concentration in difference forest types was discussed and the relationship between the negative air ion concentration and certain environmental factors such as temperature, humidity and topography was further analyzed. The results showed that ： （ 1 ） The diurnal variation of negative air ion concentration decreased first and then increased, i. e. , higher in the morning, lower at noon, and gradual rising in the afternoon; （2） The month- ly variation of the negative air ion concentration followed the patter： higher in June, July and September, and lower in May, August and October; （3） Negative air ions concentration gradually decreased with increased spatial height; （4） Negative air ion concentration of different species followed the order, from the highest to the lowest, of apple 〉 chestnut 〉 cork oak 〉 pine 〉 locust ; （5） The concentration of negative air ion was negatively correlated with tem- perature and positively correlated with humidity; （6） Negative air ion concentration on the slope was greater than in the ditch, but the difference was not significant.