关键词: 重金属, 污染防护, 绿化树种

Abstract: Based on the basic principles of restoration ecology, the trigger-action model for rocky desertification control was proposed, i.e., the ability that an ecosystem enables itself to develop was called dominant force, and the interfering factor resulting in the deviation of the climax of eco-logical succession from its preconcerted status was called trigger factor. The ultimate status of eco-logical succession was determined by the interaction of dominant force and trigger factor. Rocky de-sertification was the result of serious malignant triggers,and its control was the process of bening triggers in using the ecological restoration method of artificial designs to activate the natural desig-ning ability of an ecosystem. The ecosystem of Karst rocky desertification in Fenghuang County with restoration measures was taken as a case to test the model, and the results showed that the rest-oration measures based on trigger-action model markedly improved the physical and chemical prop-erties of soil and increased the diversity of plant. There was a benign trigger between the restoration measures and the Karst area. The rationality of the trigger-action model was primarily tested by the results in practice.

Key words: Heavy metal, Pollution protection, Greening tree species