崇明岛不同生态用地空气负离子分布规律研究

为获得崇明岛不同生态用地空气负离子的实时变化趋势，以崇明岛林地、绿地、湿地和对照点为研究对象，利用Epex空气离子测量仪进行实时监测，并采用单级系数和安倍空气质量评价系数进行空气等级评价。结果表明:不同生态用地空气负离子浓度的时间变化趋势有所差异，正离子浓度变化趋势与负离子不完全相同；空气负离子均值浓度表现为夏季:湿地>绿地>林地>对照；秋季:湿地>林地>绿地>对照；夏季和秋季湿地空气负离子浓度显著高于其他3个测点，且均以对照点空气负离子浓度最低；所有观测点空气负离子的单级系数q<1，空气负离子浓度基本达到1 000 个·cm^-3，空气质量良好。

Variation of Negative Air Ions in Different Ecological Lands in Chongming Island

In order to obtain real-time trends of negative air ions in different ecological lands of Chongming Island,woodland,parkland,wetland and control point were chosen as the research object,and the concentrations of negative air ions of real-time monitoring were measured by Epex air ion measuring instrument and evaluated with the methods of ion polarity ratio and air ion assessment index.The results showed that the concentrations of negative air ions varied with different ecological lands,and the concentrations of positive air ions were different from negative air ions.The order of negative air ions in summer was wetlands>parkland>woodland>control point; and in autumn,the order was wetlands>woodland>parkland>control point.The concentrations of negative air ions of wetland were significantly higher in summer and autumn,and the concentration of control point was the lowest.The ion polarity ratio in all observations is less than 1,and the concentrations of negative air ions reached to 1 000 ions·cm^-3,that indicated the air quality was good.