Antibitic Functions And Volatile Organic Compounds From Pinus Tabulaeformis Var. Mukdensis Uyeki And Betula Platyphlla Suk

Urban green plants is an important component of the landscape and the ecosystem in a city,as it plays a vital role in maintaining ecological balance of a city,beautifying landscape, cleaning air,improving environmental quality,removing fatigue,inhibiting and killing pest, promoting physical and sentimental health of city residents.Aming to elaborate the component and the dynamic variations in different seasons of the volatile organic compounds(VOCs) of Pinus tabulaeformis var.mukdensis Uyeki and Betula platyphlla Suk.,elaborate the connection between plant secondary metabolites and phyllosphere microbe,research on the active component and contents of VOCs,experimental date was provided to landscape design of city in this paper,results showed that,1.The amount of bacteria in phyllosphere microbe of Pinus tabulaeformis var.mukdensis Uyeki and Betula platyphlla Suk.is the most one,it beyond 80 percent of total microorganism, so it is preponderant community,fungi is the next,both of them decided the quantitative variety of phyllosphere microbe.The trend is the same about total phyllosphere microbe of Pinus tabulaeformis var.mukdensis Uyeki and Betula platyphlla Suk.,it is the most amount of phyllosphere microbe in summer of Pinus tabulaeformis var.mukdensis Uyeki and Betula platyphlla Suk.,next is in autumn,the third is in spring.In the crown of a tree,the middle canopy hasthe most bacteria,the amount of fungi are lower in high canopy than it's in the middle and lower canopy.2.The component and content have sigificant differences between Pinus tabulaeformis var.mukdensis Uyeki and Betula platyphlla Suk..The component and the relative content of the volatiles were obviously changed in different seasons.The major VOCs of Pinus tabulaeformis var.mukdensis Uyeki in spring,summer and autumn is the terpene.Caryophllen is leading component in spring.In summer,the most amount of VOCs is Camphene.The olefin is primary in autumn,3-Octen-5-yne,2,7-dimethyl- is leading component,and little ketone, alcoholic aldehyde,esterfy is in existence in summer.The major VOCs of Betula platyphlla Suk.in spring,summer and autumn is the terpene,olefin.The terpenes include 3-Carene, (1R)alpha-Pinene,Caryophllen.The major olefin of VOCs is Ethene,methoxy-.3.With the aid of settling plate technique is adopted,investigating the atmospheric microbs in Harbin city,and different most typical sites are selected to sample.The result showed that,The quantitative distribution and variation are apparently related to such factors as the scale of green belt,frequency of population and vehicle.The number of airborne bacteria is larger than other regions in square and station.The numbr of airborne fungin is larger than other sites in forest and culture regions. The result of researching the effect of gardening plants cleaning the airborne microbes shows,the effect is the most obvious in summer and in the morning.In the selected plants, Pinus tabulaeformis var.mukdensis Uyeki has better effect to clean bacteria.4.Inhibitory activities of VOCs monocase were evaluatd.The result showes that,the inhibition on aspergillus niger,Trichoderma virens is lower or scarcely by Camphene.The obvious inhibition on experimental microorganism of Limonene,Camphene.The inhibition rate is better with increasing concentration.5.Inhibition activities of extract from experimental plants were evaluated.Pinus tabulaeformis var.mukdensis Uyeki has better inhibition activities.The inhibitory activities of extracts had better heat stability.The test showed that the differences are obvious among the extract methods,plant species and different extracts.Based on the above results,it is suggested that not only visual landscape ecological effect but also olfactory chemoecological effect should be considered when choosing plants for landscape design of city.Pinus tabulaeformis var.mukdensis Uyeki,Betula platyphlla Suk. releases maximum quantity of terpenes.They are capable of cleaning atmosphere,improving environmental quality,promoting physical and sentimental health of city residents,they should be careful to be chosen as landscape plants for residence and work area.