林芝市不同生态功能区空气负离子特征研究

以林芝市7个功能区为研究对象,采用单因素方差和皮尔逊相关系数对空气负离子浓度状况进行研究,以期为市政规划提供参考,促进旅游业的发展。结果表明:1)除商业街外,其他生态功能区空气负离子浓度均为上午<下午;水体、湿地日变化均为三峰型,空旷地、游憩绿地、商业街日动态呈双峰“M”型,林地、绿地日动态表现为单峰型。2)林芝各生态功能区浓度大小为水体(1423个·cm^-3)>绿地(1056个·cm^-3)>空旷地(1039个·cm^-3)>林地(973个·cm^-3)>湿地(812个·cm^-3)>游憩绿地(723个·cm^-3)>商业街(717个·cm^-3),平均浓度为943个·cm^-3,水体旁空气负离子浓度是商业街的1.78倍。水体与其他6种生态功能区差异显著(P<0.05),绿地、空旷地与湿地、游憩绿地、商业街差异显著(P<0.05),其他功能区之间差异不显著(P>0.05)。3)林芝各生态功能区空气质量指数(CI)大小为水体(1.143)>绿地(1.133)>林地(0.935)>湿地(0.921)>游憩绿地(0.891)>空旷地(0.845)>商业街(0.797)。4)空气负离子浓度与温度正相关而不显著(P>0.05),与相对湿度负相关而不显著(P>0.05)。林芝市空气负离子浓度较高、空气质量较好。

Characteristics of Negative Air Ions in Different Ecologica Functional Areas of Linzhi of Tibet

Taking the seven ecological functional areas in Linzhi as the research objects,the negative air ion concentrations (NAIC) were studied by one-way variance and Pearson correlation coefficient to provide reference for municipal planning and to promote the development of local tourism.The results showed that:1)except for the commercial area,NAICs of other ecological functional areas were all higher in the afternoon than in the morning;the daily variation of NAICs in water body and wetland presented 3-peak-pattern,and “M-tpye-pattern” in the areas of open space,recreational green space and commercial area.2)The order of NAIC in seven ecological functional areas was water body (1 423)>green space (1 056)>open space (1 039)>forest land (973)>wetland (812)> recreational green space (723)>commercial area (717 ions·cm^-1),with an average concentration of 943 ions·cm^-1 ,and NAIC near the water was 1.78 times higher than in the commercial area.The differences between the water body and the other six ecological functional areas were significant (P <0.05).The differences between green space,open space and wetland,recreational green space and commercial street were significant (P <0.05),and the differences between other ecological functional areas were not significant (P >0.05).3)The order of air quality index (CI) of seven ecological functional areas was water body (1.143)>green space (1.133)>forest land (0.935)>wetland (0.921)>recreational green space (0.891)>open space (0.845)> commercial area (0.797).4)NAIC was positively correlated with temperature but not significant (P >0.05),and negatively correlated with relative humidity but not significant (P >0.05).It was concluded that the concentration of negative air ions in Linzhi City was higher,the air quality was better.