Abstract: By comparing the community characteristics between primeval rain forest and planted A momum, the influence of A momum planted in ravine rain forest on the species composition, structure, physiognomy and dynamics of the forest, and its juvenile growth were studied.Planting A momum in the rain forest destroyed the biodiversity of the forest, and made 70～90% of its species and above 98% of its individuals disappeared. All shrubs and herbs almost disappeared, and 60～70% of tree species and 50～80% of their individuals were lost. Planting A momum made the community structure simple and the layers obvious. The community after A momum planting keeps the physiognomy of the rain forest, but is an unstable secondary forest, and not a rain forest.

Key words: A momum, Tropical rain forest, Biodiversity, quinclorac, immobilization, bioremediation, corncob, bamboo charcoal and canola meal carrier