Bacteriostatic Effect Of Common Garden Plants In Hangzhou

Plants played a very important role in landscaping,which could not only beautify the environment,but also played a role in humidification,cooling,dust reduction and bacteriostasis.In recent years,with the increasing attention to the improvement of human settlement environment,the bacteriostatic effect of garden plants and their communities had become the focus of attention.This paper selected common garden plants in Hangzhou as the research object,and studied the effects of volatiles of leaves from common garden plants and their combinations on Escherichia coli and Staphylococcus aureus and other atmospheric natural bacteria,analyzed the bacteria carrying capacity and dust retention capacity of plant leaf surface under natural condition,and the bacteriostatic effects of artificial plant communities.The results could provide reference for the selection of plants with stronger bacteriostatic and dust reduction effects,and the construction of multi-functional plant landscape.(1)The volatiles from the leaves of common garden plants had bacteriostatic effects on Escherichia coli and Staphylococcus aureus.The bacteriostatic effects of volatiles from different plant species or combinations.on Escherichia coli and Staphylococcus aureus were significantly different.The bacteriostatic effects of Sabina chinensis,Ligustrum japonicum and Ophiopogon bodinieri were significantly sronger than that of other trees.The bacteriostatic effects of most plant combinations were stonger than that of each single plant,and the bacteriostatic rate increased with the increase of the number of plant combinations.(2)There were significant differences among plant species in the amount of bacteria carried on leaf surface under natural conditions,and the bacteriostatic effect of leaf water extracts from different plants on Escherichia coli or Staphylococcus aureus were also different.The bacteriostatic effects of Sabina chinensis,Ligustrum japonicum and Podocarpus macrophyllus were significantly stronger than that of other trees.All plant leaves showed dust retention effect,and the differences were significant among plant species,with the dust retention amount of leaves ranging from 0.72-2.92 g/m~2.There was no significant correlation between the amount of bacteria carried by plant leaves and the amount of dust retention on leaves,and only a few species,such as Podocarpus macrophyllus and Ilex crenata had strong bacteriostasis and dust retention.(3)There were significant differences in bacteriostasis among different plant communities.The artificial plant communities that consisted of the trees or shrubs with stronger bacteriostatic effect,such as Podocarpus macrophyllus,Osmanthus fragrans,Ilex crenata and Ligustrum japonicum and with more complex community structure had the stronger bacteriostatic effect,and weaker on the contrary.With the increase of the distance from the plant community edge,the bacteriostasis decreased linearly.The number of bacteria in air 1.5m away from the edge of the community was significantly higher than that in the communities,indicating that the bacteriostatic range of plant communities was limited.As the bacteriostatic effects of volatiles from multiple plant combinations were stronger,the natural communities composed of multiple plants also showed stronger bacteriostatic effects.