Abstract: The paper dealt with the characteristics and conditions of eco-environmental disasters including soil erosion, forest degeneration,shortage of water resources, environmental pollution in Hunan Province. The systematic analysis indicated that the ecological .environment in the province had been improved in part, but deteriorated as a whole. The eco-environmental disasters will become serious from 1995 to 2000 in the province. Among four kinds of eco-environmental crises, the pollution of "three waster" is the most serious and an important cause of natural disasters. The countermeasure of preventing and reducing the eco-environmental disasters is put forward.

Key words: root interaction, root separation, chlorophyll content, yield, microorganism.