扬州蜀冈西峰生态公园春季林地的空气负离子密度

Air negative ions concentration of woodland type in Yangzhou Shugangxifeng Ecological Park

使用ITC-201A空气离子测试仪,对扬州蜀冈西峰生态公园内香樟+刺槐+棕榈(Cinnamomum camphora×Robinia pseudoacacia×Trachycarpus fortunei)混交林以及杜英(Elaeocarpus sylvestris)、桃(Amygdalus persica)、垂柳(Salix babylonica)、紫叶李(Prunus ceraifera cv.pissardii)、广玉兰(Magnolia grandiflora)、雪松(Cedrus deodara)、香樟(Cinnamomum camphora)纯林的春季(3—5月)林内空气负离子密度进行观测,结果表明:林地空气负离子密度日变化曲线呈双峰型,峰值首先出现在10:00,低谷大多出现在12:00左右;14:00又出现一峰值,其后逐渐下降.林地空气负离子密度变幅以3月最小,5月最大,林地空气质量以5月最好,3月最差,且广玉兰林的空气质量最好;林地空气负离子密度变化与林地温度呈极显著负相关,与林地相对湿度呈显著正相关.

Observations for air ions concentration of mixed forest（Cinnamomum camphora×Robinia pseudoacacia× Trachycarpus fortunei）and pure forest（Elaeocarpus sylvestris,Amygdalus persica,Salix babylonica,Prunus ceraifera cv.pissardii,Magnolia grandiflora,Cedrus deodara and Cinnamomum camphora）in spring（March-May） with ITC-201A air ion monitor were conducted：the air ions concentration of woodlands in Yangzhou Shugangxifeng Ecological Park showed bimodal distribution in its daily change curves,and its first peak appears at the time of 10：00,trough appears mostly around 12：00;there is another peak at 14：00 and subsequently falls.Changes of air negative ions concentration in the spring month shows gradual upward trend in amplitude with smallest variations in March while the greatest variations in May;woodland air quality have a gradual increase in synchronization,and forest of Magnolia grandiflora has the highest level.The air negative ions concentration of woodland is negatively correlated with temperature,and positively related to relative humidity.