Investigation On Ecological And Environmental Effects Of Typical Plant Communities In The Hohhot Arboretum

As an important part of the urban green space system,urban park green space played an important role in urban construction.It could not only provide residents with a place for recreation and relaxation,but also effectively regulated the microclimate and improved the urban ecological environment.Therefore,studying the ecological environmental effects of urban park green space plant communities could provide feasible suggestions for optimising the configuration of urban park green space plants and creating recreational areas that were conducive to the physical and mental health of residents.This thesis took the Hohhot Arboretum as the research object,selected seven plant communities as typical sample plots and the entrance square as the control point.From October 2021 to July 2022,meteorological factors,airborne particulate matter concentration and other ecological environmental effect factors were monitored in the field in eight typical sample plots in the arboretum.Based on the field research data,the factors influencing the ecological environmental effects of typical plant communities,the correlation relationship between the factors of ecological environmental effects and the differences in the integrated ecological environmental effects of typical plant communities were specifically analyzed,and the conclusions were as follows.1.The ecological environmental effects of plant communities in the arboretum were influenced by time and community structure.In terms of cooling and humidifying effects,the cooling effect was strongest in autumn and worst in summer.The humidifying effect was strongest in autumn and worst in winter.The cooling effect of arbor-herb plant community was the best in four seasons,and the humidifying effect of shrub-herb and arbor plant communities were better.In terms of abatement of airborne particulate matter effect,the effect was stronger in summer and autumn,with daily average airborne particulate matter concentration reaching the national class Ⅰ ambient air quality standard,followed by class Ⅱ and above in spring and the worst in winter,reaching class Ⅲ and above.The arbor-herb and arbor plant communities had a stronger ability to abate airborne particulate matter in four seasons.In terms of air cleanliness enhancing effects,each plant community was the most capable of cleaning the air in summer and the least capable in winter.The arbor-herb plant community had the best capacity to clean the air in four seasons.In terms of improving the human comfort effect,each plant community improved human comfort in both spring and summer.The arbor-shrub-herb plant community had the best effect on improving human comfort.2.The concentration of airborne particulate matter in typical plant communities in the arboretum showed a highly significant negative correlation with temperature and comfort index of human body(P<0.01)and a highly significant positive correlation with relative humidity(P<0.01).The concentration of negative air ion was negatively and significantly correlated with temperature(P<0.05).The comfort index of human body showed a highly significant positive correlation with temperature(P<0.01)and a highly significant negative correlation with relative humidity(P<0.01).3.There were differences in the integrated ecological environmental effects between the typical plant communities of the arboretum.The best ecological environmental effects were found in autumn,followed by spring and the worst in winter.The best integrated ecological environmental effects were in the arbor-shrub-herb plant community in four seasons.Plot S1 and S3 had the best integrated ecological environmental effects,while plot S6 and S7 had the worst.Visitors were recommended to carry out recreational activities in plot S2 after 16:00 in spring and in plot S3 from 14:00to 16:00 in autumn.