EFFECTS OF ION BEAM IMPLANTATION ON POLLEN GERMINATION AND POLLEN TUBE GROWTH OF Cedrus deodara Determination of Necrotic Spot Pathogen on Needle of Cedrus deodara and the Biological Characteristics of the Pathogen Characteristics of spatial variations in xylem sap flow in urban greening tree species Pinus tabulaeformis, Cedrus deodara and Robinia pseudoacacia in Beijing, China STUDY ON THE DIEBACK OF CEDAR CAUSED BY BOTRYTIS LATEBRICOLA JAAP. Study on Forecast of Ovipositing Amount and Occurrence Time of Ceroplastes ceriferus Diurnal Rhythm of Emission of Volatile Compounds Emission from Acer truncatum and Cedrus deodara Chemical constituents of flavonoids in pine needles of Cedrus deodara Chemical constituents of ethyl acetate fraction from pine needles of Cedrus deodara Chemical constituents in n-butanol extract from pine needles of Cedrus deodara Determination of proanthocyanidins and DPPH radical scavenging activity of different parts from Cedrus deodara Study of soil water and physiological characteristics of Cedrus deodara under water stress Chemical constituents of flavonoids in pine needles of Cedrus deodara