The Study On The Time-space Change Of Air Anion And The Influential Factors In Different Ecological Environment In Hefei City

This paper has studied the space-time change law of the anion's density and theinfluential factor to the anion in different ecological environment in Hefei city .It hasalso studied the relationship between the anion's density and the vehicle,thevegetation,the hydrology and other influential factors. The distribution of anion in different ecological environment is extremelyuneven, and the quality of air differs significantly. Fist of all, the density of negativeion is widely differs in different ecological environment in Hefei city. The negativeion's density of forest is highest, it about 1500 Num/cm3, it's smaller near water, andit's lowest in factory, it about 125 Num/cm~3. Secondly, the daily change of anion'sdensity is notable. The negative ion's density in forest or near water is all relativelylow in morning and evening, while high at daytime, and it's highest at noon. Inteaching area and dwelling area the daily change of negative ion's density iscomparatively complicated, it's highest in morning, while lowest at dusk, it's all in thelow level at 8 o'clock, 12 o'clock, 14 o'clock and 16 o'clock , in other period it'srelatively high. Appraise it with the single coefficient q and the coefficient Ci , theresult is that ,only in forest the single coefficient q is below 1, the air quality iscleanest; the single coefficient q of other areas are all above 1, and in factory andtraffic areas the single coefficient q are all below 0.2, it means the air is polluted. The change of the negative ion's density of different season in differentecological environment is very notable. The changing rate of the negative ion'sdensity of different season in Dashu mountain is the biggest, the density in summer is1322Num/cm3, it's smaller in spring , when in winter it's lowest ,it's only about736Num/cm3. In spring the negative ion's density is highest in Shifu square, while insummer it's lowest. The relationship between negative ion and different tree is different, by means ofanalyzing, we draw the conclusion: under Yangtree the negative ion's density isrelatively highest, it's lower under bamboo, and it's lowest under Maweipoin. And theCi which under Yangtree is biggest, it's about 2.38, it means the air quality is finestthere; the Ci under bamboo is lower; it's lowest under Maweipoin , it's about 1.11, theair quality is relatively poor. In addition, the hydrology has great effect on the air anion density, the density ofnegative ion can rise by 869 Num/cm3 after rain. The contribution of fountain to thenegative ion density is great, the negative ion's density of the Shifu square fountain inHefei city can reach 32790 Num/cm3.The negative ion's density which near reservoiris also very high. Through observing, can draw the conclusion that: the relation between thenegative ion's density (y) and the height (x) is: y=398.002+2.702x This experiment also studied the relation between the negative ion's density andthe flow of car or people , and has made a relevant analysis to the relationship , therelation between the negative ion's density (y) and the flow of car (x1) is:y=425.319-1.316 x1the relation between the negative ion's density (y) and the flow of people (x2) is:y=505.658-0.475 x2the relation between the density of negative ion and the flow of car and people isextremely remarkable.