Study on hydrocarbon compounds from natural source in the Pearl River Delta area.

Using the enclosure sampling technique, the emission rates of natural hydrocarbon compounds (HC) from the major privileged species of trees in the Pearl River Della area were analyzed and measured and using the sourceinvestigation method, the flux of HC from the natural sources in the area was infered. These tree species included Pinus massonia, Pinus elliotii, Castanopsis fissa, Eucalyptus robusta, Albizia folcata, Acacia sp. and Schima superba. The HC from the measured tree included mainly isoprene and terpenes, in which the terpenes identified were a-Pin, b-Pin, Cam, Car, Ter, Limo and Oci et al. The report evaluated, by the precision of 9km9km grid, the distribution data of forestcoverage in the area, and according to the emission factor measured and other related materials, maked an evaluation of the emission amount of natural HC in the area for the first time that the yearly amount emitted by forest into theatmosphere was 196000 tons, which occupied 57% of the total HC in the area.