In order to study the photosynthesis and environmental adaptability of Populus alba var.pyramidalis,the chlorophyll fluorescence parameters of its leaves were determined by PAM-2100 fluorescence analyzer.The re-sults showed as follows:from 8:00 to 20:00,the diurnal variation of the photosynthetically active radiations(PAR),the photochemical electron transport rate(ETR)and the photochemical quenching efficiencies(qp)of Pop-ulus alba var.pyramidalis leaves all presented double-peak curve;at 10:00,the photosynthetically active radiations(PAR)and the active quantum yield(Yield)of appeared the maximum peak,and the maximum peak of active quan-tum yield(Yield)was 0.709;the maximum quantum yield of PS Ⅱ(Fv/Fm)was higher and maintained at the same level throughout the day,and the photoinhibition was not obvious;from 12:00 to 18:00,the photochemical quenching efficiencies(qp)decreased while the non-photochemical quenching efficiencies(qN)did not decrease;the primary light energy conversion efficiency was higher and the photosynthesis was stronger.
Hexi CorridorPopulus alba var.pyramidalischlorophyll fluorescence parametersdiurnal variation
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