A 28 day marine ecosystem enclosure experiment using BP-1100X dis-persant and dispersed Shengli crude oil as addictive was conducted in Xiamen, China, in December 1989. The enclosures used were composed of 4 barrels, which,based on nutrient addation, barrels C1 and C2 were assigned as controls, barrel DB was added with BP-1100X (1.0mg/1) and barrel BO, was added with a mixture of BP-1100X (1.0mg/1) and Shengli crude oil (10 mg/1), The results showed that the ecological processes were basically the same as t...