NATURAL HYDROCARBON COMPOUNDS EMITTED FROM VEGETATION IN CHINA

The emission of terpenes and isoprene from 15 types of trees, bamboo, grass and paddy rice have been measured by means of the enclosure samp ling method and GC-FID analysis. The measurement results show a diurna l and seasonal variation of the emission with peaks at noon and in sum mer months, which are closely related to temperature and irradiation. Average emission rates for Pine, Cypress, Poplar and Scholar, the prim ary trees in Beijing and China, are measured to be 2.7, 0.009, 4.7 and 1.3 mu g.g(-1)h(-1) respectively. Annular amount of HCs emitted from the 4 type of trees are estimated to be 9.1x10(3) and 8.3x10(6) for Be ijing city and China respectively.