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Guo Xudong Chen Liding Fu Bojie (Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085)  
Land use/land cove changes has been the core program of global environmental change research. Its impacts to regional ecological environment are one of the important contents of land use/land cover research. This paper analyzed the effects of land use/land cover changes on regional climate, atmospheric quality, soil properties, water quantity and quality. Land use/land cover changes influence regional climate by altering the surface albedo and the composition of green gas and trace gas in atmosphere. They affect some soil ecological processes and different compositions of land use/land cover have important effects on nutrient flow in soil. Non-point source pollution is the main methods by which land use/land cover changes influence water quality, many important Non-point pollution sources are linked with the changes. Some eco-environmental problems caused by human improper utility such as soil erosion, land degradation, water scarcity and sea approaching are also proposed.
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