Research On The Effect Of Reclaimed Water On Vocs And Chlorophy Fluorescence In Urban Lawn

Due to scarcity of water resources, reclaimed water irrigation is used more frequently, and its effect on plants has attracted much attention. In this study, enclosure sampling technique, GC/MS and LI-640 photosynthetic apparatus was used to study the volatilization of tall fescues, Kentucky bluegrass and ryegrass of northern urban greenbelt, which has been irrigated with reclaimed water, and compare the difference of volatilization between clean water and reclaimed water. The effects of reclaimed water irrigation against the three grasses are discussed among plant fluorescence parameters: initial fluorescence (F₀), optical efficiency Fv/Fm, non-photochemistry bisporphyrins qN, photochemistry bisporphyrins qN.etc. Reclaimed water came from BTBU Reclaimed Water Station.The major VOCs released by these three grasses are hemiterpenes, alkanes, aldehydes, alcohols, esters, acids and ketones, however, olefin covers highest proportion. The tall fescues volatile more than the other two grasses in season spring, summer and fall. Besides, they all volatile most in summer, fall less. No obvious changes of volatileness organic matters has been found among above three seasons, nor the new materials and the changes of volatilization in any material, which proved reclaimed water didn't have the obvious effects on the plant volatileness organic matters. Comparing the parameters such as Fo,Fv/Fm,qN,qP between clean water and reclaimed water, it is found that the plant fluorescence didn't show any sharp changes under reclaimed water irrigation, however, all the index present the high consistency with clean water. So, reclaimed water irrigation doesn't affect the physiological effect of the above three grasses obviously. The reclaimed water from PKU can be used as greenbelt irrigation water directly.