循环经济是21世纪的新经济, 是以资源环境、经济与社会协调发展为目的的新型发展模式,是推进可持续发展的新模式,地理学应加强对循环经济模式的区域研究。循环经济模式的5 种基本类型包括:①环境效益与经济效益同提高的模式;②环境效益提高,经济效益保持不变的模式;③环境效益提高,经济效益下降但大于零的模式;④环境效益提高,经济效益下降且等于零的模式;⑤环境效益提高,经济效益下降且小于零的模式。认清循环经济不同类型模式的特征,有助于我们深刻理解循环经济的"多赢",正确选择合适的循环经济模式。认为循环经济模式存在空间差异规律包括环境质量"U"字型分布规律和环境质量地区差距的倒"U"字型规律,在近期缩小中国三大经济地带之间环境质量的差距是不现实的,应通过因地制宜地推广循环经济模式减缓三大经济地带环境质量差距扩大的趋势。

Circular economy is a new economy in 21st century,with the harmonious development of Resources and environment, economy and society as its goal.Mode of circular economy is a new type of mode to promote sustainable development, so the study of regional circular economy mode should be strengthened in the geographical field.This paper discusses the five basic types of circular economy mode and their main characteristics.These five basic types of circular economy mode include mode of rising of both economic and environmental benefits; mode of rising of environmental benefits with economic benefits unchanged; mode of rising of environmental benefits with economic benefits declined and being over zero; mode of rising of environmental benefits with economic benefits declined and being zero, and mode of rising of environmental benefits with economic benefits declined and being under zero.It is pointed out that the reasonable types of circular economy mode among these five basic types of circular economy mode can be chosen if people understand their main characteristics.Only in this way can we have a sound grip of environmental, economic and social benefits of circular economy.It is argued that circular economy mode has spatial rules including the spatial difference rules, the "U" distribution rules of environmental quality and the inverse "U" distribution rules of the regional gap of environmental quality.It is also argued that it is not realistic to reduce the gap of environmental quality between the three economic regions in China in the near future and it is realistic to slow down the tendency of enlarging the gap of environmental quality between these three one in China through making the right choice among the five basic types of circular economy mode in the light of local conditions in the near future.The present study first discusses the types of circular economy mode which are suitable for China, studies how to construct enterprise clusters on apt types of circular economy mode, and proposes the concrete ways.The quantity of enterprise clusters on the apt types of circular economy mode should decline from the east economic region to the west one in China on the whole.This paper also states that enterprise clusters on the mode of rising of both economic and environmental benefits and the mode of rising of environmental benefits with economic benefits unchanged should be popularized, and that enterprise clusters on the mode of rising of environmental benefits with economic benefits declined but being over zero among the industries, which have severe pollution, should also be paid great attention to.Then, this paper analyses the constitution of the industrial system of regional circular economy and argues that environmental industry and retrieving and reusing industry should be developed in a big way, and the circle among industries and different parts of industries to optimize the regional industry structure should be strengthened.Finally, this paper displays the principles to choose leading industries, which should include scale principle, marketing potential principle, and comparative circular economic advantage principle.