Aero-anion ecological efficacy in six types of plant communities.

A comparison of 1.5 m above ground aero-anion and positive air ion concentration for six plant communities，Pinus massoniana，Sapindus mukorossi，Magnolia grandiflora，Phyllostachys praecox，Cunninghamia lanceolata，Lagerstroemia indica，and turf grass，was conducted using a correlation analysis with relative humidity，temperature，solar radiation intensity，and ultraviolet radiation intensity. Results showed that compared to a corresponding open space，the aero-anion effect was better in each plant community，and their individual aero-anion concentration was in the order of P. massoniana＞S. mukorossi and M. grandiflora＞P. praecox＞C. lanceolata＞L. indica＞turf grass. According to the diurnal variation curve between 7 : 00 and 19 : 00，the aero-anion concentration tended to double peak from 9 : 00 - 10 : 00 and 15 : 00 - 16 : 00. A correlation analysis showed a significant（P＜0.01） positive correlation （r = 0.702） between aero-anion concentration and relative humidity，a significant（P＜0.05） negative correlation（r = － 0.637） between aero-anion concentration and temperature，a negative correlation（r = － 0.191） between aero-anion concentration and solar radiation intensity，and a significant（P＜0.05） positive correlation（r = 0.580） between aero-anion concentration and ultraviolet radiation intensity（UVB）.［Ch，2 fig. 3 tab. 15 ref.］