The Research On16Common Landscape Plants VOCs And AHP Evaluation

In order to elaborate the main volatile organic compounds (VOCs) from the landscape plantsand their variations in different seasons, the results could provide a reference for the landscapedistribution. We collected the VOCs from16common landscape trees and different plantcommunities using the dynamic headspace air-circulation method, identified the main compoundsof VOCs with thermal-desorption cold trap/gas chromatography/mass spectrum (TDS/GC/MS).Plant and plant community evaluated pattern is established with Analytic Hierarchy Progress(AHP) method. The results were as follows:1. The compositions and content of VOCs from the flowers of3arbors,4shrubs and3herbsand the leaves of3arbors and6bushes under the natural state were analyzed. The VOCs of plantsis a mixture of several organic compounds, differences in plants and organs make the differencesin the composition of VOCs. The flowers of plant mainly release terpenes, aldehyde, and ester,such as α-Pinene, β-Pinene, Nonanal and3-Hexenyl-1-Acetate. Leaves mainly release terpenes,esters and alcohol, such as β-Pinene,3-Hexenyl-1-Acetate, which accounts for a high proportion,and3,7-Dimethyloctan-1-ol.2.The seasonal variation of VOCs from leaves of3arbors and6bushes were analyzed. Theirrelease and variability depend on the season of their releasers, as well as the environmentalconditions. Plants release more VOCs in spring and autumn except Castanopsis sclerophylla.3. The compositions and content of air VOCs in four plant communities were analyzed. In theVOCs of herb flowers sampled in the air over plants, most are aromatic compounds and aliphatichydrocarbon compounds, while terpenoids content is low. With the abundance of plantcommunities, in air of the tree and shrub and grass combination communities, aromaticcompounds and aliphatic hydrocarbon compounds reduced, terpenoids content increased,accounting for44.58%of the total.4.12common landscape plants and4plant communities were evaluated using AHP methodfrom the attitude of plant VOCs in Hang Zhou. Results were as follows, Individual plants:astanopsis sclerophylla＞Iles cornuta var. fortune>Ilex crenata cv. Convexa>Manglietiafordiana>Tagetespatula L>Buxus sinica>Ligustrum quihoui var. aureaphylla>LoropetalumChinese Var. rubrum>Photinia serrulata>Fatsia japonica>Petunia hybrida Vilm>CockscombFlower, plant communities: tree and shrub and grass combination communities> arborcommunities> shrub communities>herb communities. That is, the more complex, the more abilityfor the environmental purification of plant communities.