Abstract: Base on 2-year consecutive investigation from June 2005 to October 2006, the effects of different slope aspects on the early-stage succession characteristics of plant communities on Vetiveria zizanioides slope-protection land were studied. The results showed that in the earliest period, the main plants settled on the slope-protection land were of Gramineae, Compositae and Leguminosae, with their species number occupying 5909%〖KG-*2〗-〖KG-*7〗9286% of the total. Since the second year of V. zizanioides planting, the characteristics of the plant communities on sunny and shady slopes began to differ. V. zizanioides population had obviously higher species dominance on sunny slope than on shady slope, and kept increasing on sunny slope but represented a declining trend on shady slope. The species dominance of V. zizanioides population was significantly negatively correlated with the richness, diversity index, and evenness index of the plant communities, but positively correlated with the community ecological dominance index.

Key words: Bio-remediation, Phytoplankton, Community