A Study of Contents and Daily Dynamics in the Phytoncide from Two Species of Garden Tree

Phytopcide which can enhance human immunity, inhibit the growth of cancer cells, has a special medical function, and has certain health effects of regulating blood pressure, relieving mental disorders, reducing blood sugar, relieving pain and anti-spasticity.With the rapid development of forest health industry in recent years, the research,development and utilization of forest phytopcide have attracted more and more attention from scholars.The study on the composition, relative content and diural-dynamic variation characteristics of phytopcide in volatile organic compounds released by forest health plants can provide reference for the development of forest health activities and the optimization of the time and place of health.In this study, two forest health plants, Acer palmatum and Camellia sinensis, which are featured in the national forest health base, were taken as the research objects.Using dynamic headspace collection method timing quantitative adsorption samples, using Entech7200 preconcentration and Agilent7890B / 5977GC-MS instrument analysis,to identify the composition, relative content and diurnal dynamic change characteristics of phytopcide in VOCs of Acer palmatum Thunb. and Camellia sinensis.The results showed that the components of phytopcide of the two forest health plants were mainly alkanes, alcohols, aromatic hydrocarbons, ketones, aldehydes and terpenes, among which alkanes and aromatic hydrocarbons accounted for a relatively high proportion. The relative contents of terpenes, an important component of Acer palmatum Thunb. phytopcide, were higher than those of Camellia sinensis, and the relative contents of terpenes of two botanies in phytopcide showed the same diurnal variation which is the relative contents of terpenes of 8:00AM and 16:00 PM were higher, and the relative contents of 12:00 PM were the lowest.Therefore, Acer palmatum Thunb. with high ornamental value and high phytopcide content can be preferred in the construction of forest health cultivation base and selection of forest health cultivation plants.It is more appropriate to carry out forest health activities at 8:00 AM and 16:00 PM.