Abstract: By the methods of thermal desorption and gas chromatography, the emission characteristics of biogenic volatile organic compounds (BVOCs) from Populus alba × berolinensis, Salix babylonica, Ulmus pumila, and Gleditsia japonica) in Shenyang urban area were studied. The BVOCs emissions varied with test tree species. P. alba ×berolinensis and  S. babylonica had obviously higher BVOCs emissions than the other two tree species, and mainly emitted isoprene; while U. pumila and  G. japonica  mainly released limonene. The BVOCs emissions from test tree species had obvious diurnal and seasonal variation patterns,i.e., with a peak at noon or afternoon and less isoprene released at night, and higher in summer than in spring and autumn.

Key words: Biological phosphorus removal, Polyphosphate, Microorganism