Study On The Ability Of Plants To Absorb And Purify PM2.5 In Different Seasons

In the era of rapid technological development,technology has brought convenience to people while also bringing tremendous pressure to the environment.PM2.5 brings great trouble to people's lives,endangers people's health and causes various respiratory diseases,and even causes cancer.Severe smog affects people's normal life.The protection and treatment of PM2.5 is contemporary hot topic.The study found that plant in addition to changing the temperature in the air,improving negative ions in the air,and regulating environmental problems in the city,plants also have the ability to reduce PM2.5.Plants reduce the content of fine particles in the atmosphere by means of retention,etc.,effectively reducing the concentration of PM2.5 in the atmosphere,and plants have harmful gases,and absorb some heavy metals and trace elements through pores,respiration and photosynthesis.More scholars have demonstrated that plants express the ability to absorb PM2.5 through protein synthesis.This study investigated the ability of plants to reduce PM2.5 purification from three aspects.1.Select 15 different structural plant communities in Nanshan District,Pingshan District,Futian District and Luohu District of Shenzhen City to measure PM2.5 concentration in spring and summer,and then select 8 semi-natural forest plants in Shenzhen BaGuang.The community was tested for PM2.5 concentration in the spring.The results show:(1)The ability of plant communities to reduce PM2.5,the concentration within the community is 10-30?g/m3 lower than the concentration outside the community.The more complex the community,the better the effect of reducing PM2.5,and For relationship:Macrophanerophytes and Shrubs and Herbs> macrophanerophytes and shrub>macrophanerophytes and Herbs> Herbs.(2)The concentration and efficiency of PM2.5 in urban spring communities are much lower than those in urban summer plant communities.(3)The 8 spring plant community capable ability of dam light is greater than that of urban spring plant community,and the comprehensive value of BaGuang plant community has better effect of reducing PM2.5.2.Six common garden plants were selected,and each plant was divided into 2,4,6,8 10 and 12 plants for closed pollution test.After passing the pollutants into the box,the PM2.5 containing the plants was observed changes in concentration.The results show:(1)After the pollutants are introduced for two hours,the concentration of PM2.5 in the tank is obviously decreased.The longer the pollution time,the more pollutants are reduced by plants,and the stronger the number of plants is,the stronger The ability to reduce PM2.5.(2)Different plants have different ability to reduce PM2.5.The ability of plants to reduce PM2.5 is related to the area of leaves and the number of leaves.The better the effect of plants with larger leaves and dense leaves is to reduce PM2.5.(3)The mixing and collocation of different plants is stronger than the single plant to reduce PM2.5,and there is synergistic promotion and reducing between different plants.3.Six plant communities in the city,eight plant communities in dam light,three plant species for PM2.5 spring,summer,autumn,winter and different seasons of PM2.5 concentration and temperature measurements showed that plant communities and plants reduced PM2.5 The ability The higher the temperature,the better the ability of plants to reduce fine particles,and the summer is the best season for plant reduction.In summer,the temperature of urban plant communities is 31-32?,The temperature in spring and winter is 12-14?,and the amount of PM2.5 in summer urban plant community 10 is up to 36.56?g/m3,and 6.56?g/m3 in spring.In winter,it is 11.99?g/m3,and the amount of PM2.5 is 30?g/m3 in summer.The summer temperature of dam light plant community is 31-32?,the lowest temperature of the community is between 17-23?in winter,and the amount Of PM2.5 in dam light plant community is 12-20?g/m3 in summer and only 5-10?g/m3 reduction effect of the dam light community is better than that of the urban community.Compared with the urban dam light summer plant community,the dam light community reduction rate is between 40% and 58 %,while the urban area is between 30% and 40%.4.In the four seasons,the PM2.5 pollution test was carried out on the Ixora chinensis Lam.,Pachira macrocarpa(Cham.et Schlecht.)Walp.and Gardenia jasminoides Ellis.The initial concentration was about 200-300?g/m3,and some of the pollution experiments were carried out for The ability to reduce PM2.5 is the strongest.The PM2.5 reduction rate of 12 Ixora chinensis Lam.in summer is 19% higher than that in spring,36% higher than winter and 53.82% higher than autumn.Rate of Pachira macrocarpa(Cham.et Schlecht.)Walp.PM2.5 varies significantly with the number of plants,and the yield of 10 trees is 52.67% higher than that in autumn.The reduction rate of PM2.5 of 12 Gardenia jasminoides Ellis.was 48.39% higher than that in autumn.