Any ecosystem is commonly composed of organism and environmental system. Vegetation is primary producer and key factor of biological system,while water and soil are leading factors of environmental system. How to conform to and use nature,protect the integrity and continuity of the ecosystem,play ecological service function of the system,protect and improve eco-environment needs grasping key factor of ecosystem or principal contradiction,namely water,soil and vegetation. Said from the source,all human activities are dealing with water,soil and vegetation,and continuously using and changing water,soil and vegetation for production of material goods and social economic construction,thereby affecting and changing natural environment. Main problems of eco-environment are induced by the interference and destruction on water,soil and vegetation by human activities. But human beings cannot manipulate and change natural phenomenon and rule,such as sunlight,diurnal variation and revolution of the earth. Soil and water ecology is the deepening and development of soil and water conservation view,and innovation and expansion of ecological science,and indicates a kind of ecological equilibrium relationship among soil,water and vegetation on the earth inter-associating,inter-promoting and inter-developing. Broadly speaking,soil and water ecology indicates the sum total of all relations among water,soil and vegetation in motion and evolution process. Cognition of soil and water ecology from the height of philosophy is conducive to further understanding important position and role of soil and water ecology theory in eco-environment,correctly recognizing position and relationship between man and nature,and clearly finding the key of current eco-environment problem and its future and direction,which could provide important theoretic support for maintaining earth’s eco-environment and realizing sustainable development of mankind.
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